HPFRC plates for ground anchors
|
|
- Todd Chandler
- 5 years ago
- Views:
Transcription
1 Tailor Made Concrete Structures Walraven & Stoelhorst (eds) 2008 Taylor & Francis Group, London, ISBN HPFRC plates for ground anchors M. di Prisco, D. Dozio, A. Galli & S. Lapolla Department of Structural Engineering, Politecnico di Milano, Milano, Italy M. Alba Surveying Department (DIIAR), Politecnico di Milano, Milano, Italy ABSTRACT: In order to stabilize a ground slope, special plates of reduced sizes made of High Performance concrete reinforced with straight steel fibres were designed and built. The plates are reinforced also with special high bond steel bars with special steel threaded bushes welded at the ends to guarantee their tensile action on overall the slab size. Their weight is limited in order to assure the transportability by helicopter everywhere in mountain regions. After the experimental characterization of the material aimed to identify a constitutive relationship, a limit design approach was carried out. Ten plates were placed in situ and two of them were instrumented in order to follow the real stress state inside of the anchor plates: the main results are here described. 1 INTRODUCTION In the Pre-Alps region there are wide slopes originated in the glacial era, made of heterogeneous material characterized by a high geological risk. The mitigation of the risk associated to this kind of slopes is not an easy engineering problem for several geotechnical and structural reasons. A new precast retaining structure was designed to take advantage of High Performance Fibre Reinforced Concrete in order to develop a faster and more effective procedure of intervention. The structure geometry was designed to reduce as much as possible the own weight in order to allow the helicopter transport (maximum weight <8 10 kn), but at the same time the high performances of the material guarantee huge surface hardness and local toughness and a high resistance to local pressures, whose distribution on the structure are difficult to predict due to the roughness and the heterogeneity of the slope. A plate ( m), reinforced by means of four steel B450C bars aligned in the two directions and located in the intrados face, is anchored to the slope by a prestressed cable (7 strands 0.6 each made of 7 wires; diameter 15.2 mm,; A p = 973 mm 2 ; f ptk = 1860 MPa), 14.5 m long (Fig. 1) passing in a central hole suitably designed to accommodate the cable slope-face end. The bar ends are welded to threaded bushes able to guarantee a direct anchorage to the concrete at the extremities and allowing the reinforcement to be active in the whole bar length. Steel fibre reinforcement was used, without the introduction of any further conventional Figure 1. Geometry of anchor plate (measures in ). reinforcement. Three more plate elements were cast in order to carry out experimental tests in the laboratory with well known boundary conditions. The paper describes the material characterization and the handling phases of ten plates placed in an environmental laboratory of the Politecnico di Milano located in Caslino d Erba close to Como (di Prisco et al. 2006). A careful monitoring of three plates (the two here described anchored by means of traditional prestressed steel cables and the last one anchored by means of a GFRP anchor) was planned to detect the structural behaviour along a time period of at least five years. 869
2 2 2.1 MATERIAL CHARACTERIZATION several tests (Fig. 3): (a) slump flow; (b) V funnel; L-shape box and (d) J-ring tests. The results (Table 2) confirmed a SCC consistency (Fig. 2). Mix design The composite was selected by comparing different solutions starting from the aggregates generally used by the precast producer and limiting their maximum aggregate size to 2 mm. The material presents typical proportioning of a self compacting concrete. The mix design of the HPFRCC material is specified in Table 1. Steel fibres are high carbon straight fibres 13 mm long, with a 0.16 mm diameter; their content is equal to 100 kg/m Fresh concrete tests The mix design was used to cast 13 reinforced plates without vibration and the specimens, cubes and beams, useful to identify both uniaxial compression and uniaxial tension constitutive relationships (di Prisco et al., 2008). The fresh behaviour was controlled by means of Table 1. Material mix design. C 52,5 I Slag Sand 0/2 Fiber Additive Water [kg/m3 ] [kg/m3 ] [kg/m3 ] [kg/m3 ] [l/m3 ] [l/m3 ] Hardened concrete tests An average cubic compressive strength of 140 MPa and an elastic modulus close to 40 GPa characterized the material in the preliminary qualification. Cubic compression tests and four point bending tests on notched specimens gave first cracking and residual strengths (Fig. 4a, Table 3) significantly smaller than those obtained in the preliminary tests (di Prisco et al., 2008). The residual strengths in uniaxial tension were measured by using a four point bending tests on notched specimen according to UNI Italian recommendations. The geometry of the notched specimen and its set-up are described in Figure 4a; the nominal stress σn vs. crack tip opening displacement (CTOD) are shown in Figure 4b. The recommendations suggest to compute three strengths in order to classify the bending behaviour of the material: the first crack strength (fif ) that is correlated to the tensile strength of the material, and the residual strengths respectively in the range (feq0 0.6 ) and and 3.0 mm (feq0.6 3 ) corresponding to serviceability and ultimate limit states. In the table also standard deviations are indicated. 3 STRUCTURAL DESIGN The design of the retaining structure is mainly oriented to emphasize the SFRC structural behaviour at the serviceability limit state, because the prestressed anchors Table 2. Fresh behaviour characterization. The indication between brackets are referred to the test type: (a) slump flow; (b) V-funnel; L-box and (d) J-ring test. (a) (a) (b) (d) tm tm h1 h2 t200 t400 Dm Figure 2. Plate casting. Figure 3. Fresh behaviour tests: (a) slump flow; (b) V funnel; L-shape box; (d) J-ring. 870 Dm
3 are chosen as critical ring in the construction design. In the EuroCode 7 framework, the retaining structure designed belongs to the third category, because it can be regarded as a new structure due to its conceptual design as well as to the material used. The active confinement action applied to the ground slope by means of prestressed anchor strands, allows us to consider the limit state analysis in the case C, that means to regard the slope instability associated to total or partial collapse of the tendons as the critical limit state. The safety check was performed by means of predictive calculations and by adopting the observational method. The research here described is aimed to investigate the structural behaviour of the reinforced SFRC plate during placing. It is conceived to react to a prestressing action of about 1150 kn originating by the stretching of the cable made of seven 7W strands. The plate design follows the overestimation rule which is forced by the impossibility to predict the real boundary conditions due to the roughness of the morenic slope face and the need to prevent any local cracking due to concentrated loads. About the computation of the ultimate limit state, limit analysis was used associated to a kinematic mechanism of 2 yield lines aligned to the symmetric axes of the plate and justified by the unilateral constraint of the ground reaction with the consequent rotation around the diagonal of each forth square of the plate. The specific bending moment was computed adding the contribution of each steel bar smeared along the half of each yield line to the contribution of the residual tensile strength associated to a crack opening of 2 mm, which corresponds to a steel strain of 1% when the distance of the bar axis from the top fibre (equal to 200 mm) is considered as characteristic length. 4 ON SITU PLACING PHASE 4.1 Settlement description The plates were placed in the established location on the slope as briefly shown in Figure 5. No mortar layer was introduced between the plate and the slope face to accelerate the placing procedure. Due to this choice, the rigid motion of the anchor plates was Table 3. Hardened behaviour characterization. Test Age n 4 [days] 28 Rc28,m fif,m feq(0 0,6),m feq(0,6 3),m (8.78) (1.22) (1.48) 9.76 (1.78) Figure 5. Anchor plate location on slope. Figure 4. Notched tests according to UNI 11188: (a) test set-up and (b) nominal stress vs. Crack Tip Opening Displacement. 871
4 Figure 6. Placing of anchor plates on slope. Figure 7b. Laser scanning displacements of bottom plate. 4.2 Steel anchor stretching Figure 7a. Laser scanning displacements of top plate. significant as detected by laser scanning technique and shown in Figure 7 for the two instrumented plates. Also the displacements of the four corners of these plates were measured and the relative displacements associated to each load step were computed. According to these results, the relative displacement of the barycentre of each plate, assumed as completely rigid, was also identified in order to depurate this value by the total sliding measured between the jacket reference and the stretched strands. The results are proposed for the top instrumented anchor plate in Figure 8. The force activated in the anchor cables was measured by means of suitable loading cells placed in order to measure the force in only one strand for each cable.the total force was measured by the pressure sensor of the loading system. Moreover, the relative displacement between the jacket reference and the stretched strand read at the end of each step for all the strands allowed us to deduce the real stiffness of the anchor cables. In fact, the real stiffness of each cable can be computed by subtracting from the total relative displacement the rigid displacement of the plate barycentre that takes into account also the local punching of the plate in the slope face (Figs. 7a,b). The relative displacement computed can be finally compared with the theoretical prediction based on the different assumptions on the cable length. In Figure 8 the load corresponds to that measured by the loading cell and it is referred to only one strand. The real stiffness of the strand is not known because it depends by the sliding between the strand and the mortar and also by the sliding between the mortar and the ground. The former usually is small if the injection is well done, while the latter can be significant due to the relatively high heterogeneity of the ground. In the comparison shown in Figure 8, a total active length equal to 10 m, that corresponds to the free length (5.5m) plus the half of the foundation length (4.5m), is first proposed to estimate the total displacement. Afterwards, a second theoretical curve computed with only the free length is also shown to fit the slope of the measured curve after the application of a significant load. The comparison between the experimental curve and the 872
5 Figure 8. Load vs displacement of top anchor plate during placing (normal component with respect to slope face). Figure 9a. Top plate placing: load vs deformation. theoretical ones justifies the reliability of the anchor system. It is worth to note how the important rigid displacement of the plate causes some local plasticity phenomena on the slope face, but this occurrence does not compromise the anchor system efficiency. 4.3 Plate deformation The two instrumented plates were equipped by means of 6 suitable vibrating wire sensors able to measure the strains on a 200 mm gauge length: four sensors were located at 30 mm from the intrados (one for each side; Fig. 9a,b) and two were located at 30 mm from the extrados to measure the compressive strains associated to the bending along the direction at right angle with respect to the yield line trace assumed. The values shown (Figs. 9a,b) highlight as the maximum relative displacement can justifies cracking, even if the crack opening remains always admissible according to serviceability limit states. It is also evident how large can be the scattering between the measures performed on the four sides of the plate, thus justifying the rather complex and unpredictable set of boundary conditions to take into account at the design level (Fig. 10). 5 CONCLUDING REMARKS The paper is focused on the design of a light retaining structure able to insert anchor cables in a ground slope to increase its safety coefficient by preventing its instability. The main assets of this design solution are the limited weight, the reduced cost and the high speed in its placing. The limited weight allows the designer to use it in quite inaccessible sites like mountain regions by helicopters transport on situ. The reduced cost is related to the optimized volume and to a substantial convenience when compared to a steel solution: in this case the cost ratio is larger than five times and the environmental impact is not comparable. The high speed of its placing is guaranteed by the lack of any mortar layer between the slope face and the plate. To 873
6 Figure 9b. Bottom plate placing: load vs deformation. ACKNOWLEDGEMENTS The authors thank Prof. Alberto Giussani and Prof. Marco Scaioni for their technical and financial support in the surveying activity and Dr. Fabio Roncoroni for their precious support in the on situ placing phases and Prof. Claudio di Prisco for the enlightening discussion in the design activity. The authors would like to thank also Fumagalli Prefabbricati, Basf and Halfen Companies for their technical and financial support of the overall research. Figure 10. Anchor plate during loading phase. REFERENCES this aim the use of HPFRC is particularly promising because it allows to dispose of a very high local toughness and hardness, which are essential characteristics in such structures where boundary conditions and applied constraints cannot be easily a priori known. The lack of complex reinforcement detailing allows a complete industrialized production and the structure obtained is versatile, because it can be combined with other similar structures to give rise to modular and quite articulate retaining structure. A system of anchor plates can also be designed in combination with conventional steel wire net in order to solve at the same time the surface and the deep landslide. The surveying of these structures activated via GPRS in the environmental laboratory located in Caslino d Erba will give precious information on durability of this new promising retaining structure solution. CsNR-DT 204, Instructions for design, execution and control of fibre reinforced concrete structures, Italian Standards. Naaman, A.E. & Reinhardt, H.W., Eds High Performance Fiber Reinforced Cement Composites (HPFRCC4), PRO 30, Rilem Publication S.A.R.L. Reinhardt, H.W. & Naaman, A.E., Eds High Performance Fibre Reinforced Cement Composites (HPFRCC5), PRO 53, Rilem Publication S.A.R.L. di Prisco, C., di Prisco, M., Mauri M. & Scola, M A New Design for Stabilizing Ground Slopes, Proc. of the 2nd fib Congress, Napoli (Italy), June 5 8, ID 4-1 on CD-ROM. di Prisco, M., Lamperti, M., Lapolla, S. & Khurana, R.S HPFRCC thin plates for precast roofing, Proc. of Second International Symposium on Ultra high Performance Concrete, Kassel Germany (in printing). 874
HPFRC plates for ground anchors
HPFRC plates for ground anchors M. di Prisco, D. Dozio, A. Galli, S. Lapolla Department of Structural Engineering, Politecnico di Milano M. Alba Surveying Department (DIIAR), Politecnico di Milano ABSTRACT:
More informationExperimental Tests on Tunnel Precast Segmental Lining with Fiber Reinforced Concrete
Experimental Tests on Tunnel Precast Segmental Lining with Fiber Reinforced Concrete M. Moccichino 1, P. Romualdi 1, P. Perruzza 1, A. Meda 2, Z. Rinaldi 2 1 S.E.L.I. Spa, Rome, Italy; 2 University of
More informationUltra high performance concrete: from material optimization to structural applications
Ultra high performance concrete: from material optimization to structural applications S. Moro 1*, M. di Prisco 2, B. Barragan 1, R. Magarotto 1 and J. Roncero 3 Abstract Mostly in the last decade, research
More informationUniversità degli Studi di Roma Tor Vergata CIVIL ENGINEERING AND COMPUTER SCIENCE DEPARTMENT TERC TUNNELLING ENGINEERING RESEARCH CENTRE
Università degli Studi di Roma Tor Vergata CIVIL ENGINEERING AND COMPUTER SCIENCE DEPARTMENT TECHNICAL REPORT TESTS ON PRECAST TUNNEL SEGMENT IN CONCRETE REINFORCED WITH STEEL FIBERS (DRAMIX 4D 80/60BG)
More informationCambers of prestressed precast bridge girders, prediction vs. reality
Tailor Made Concrete Structures Walraven & Stoelhorst (eds) 2008 Taylor & Francis Group, London, ISBN 978-0-415-47535-8 Cambers of prestressed precast bridge girders, prediction vs. reality M. Chandoga
More informationNUMERICAL MODELING OF PRECAST FRC SEGMENTS: THE MONTE LIRIO TUNNEL IN PANAMA
BEFIB2012 Fibre reinforced concrete Joaquim Barros et al. (Eds) UM, Guimarães, 2012 NUMERICAL MODELING OF PRECAST FRC SEGMENTS: THE MONTE LIRIO TUNNEL IN PANAMA Alberto Meda *, Francesca Nerilli * and
More informationfib Congress 2014 Mumbai
fib Congress 2014 Mumbai ID NO. 28 PRECAST TUNNEL SEGMENTS REINFORCED WITH FIBER GLASS BARS Submission No. 409 Author/s Alberto Meda, Zila Rinaldi, Simone Spagnuolo Name of Presenter, Job Title / Affiliation
More informationSYNTHETIC MACRO-FIBERS REINFORCED SELF COMPACTING CONCRETE FOR LIGHTWEIGHT PRECAST ELEMENTS. A CASE STUDY
SYNTHETIC MACRO-FIBERS REINFORCED SELF COMPACTING CONCRETE FOR LIGHTWEIGHT PRECAST ELEMENTS. A CASE STUDY Jean Philippe Bigas (1), Bruno Pellerin (1), Fabien Deschryver (1), Pietro Massinari (2) and Giovanni
More informationSTRUCTURAL BEHAVIOUR OF HYBRID CONCRETE BEAMS WITH FIBRE REINFORCED LIGHTWEIGHT CONCRETE
BEFIB212 Fibre reinforced concrete Joaquim Barros et al. (Eds) UM, Guimarães, 212 STRUCTURAL BEHAVIOUR OF HYBRID CONCRETE BEAMS WITH FIBRE REINFORCED LIGHTWEIGHT CONCRETE Linn G. Nes *, Jan A. Øverli 1
More informationPRESTRESSED CONCRETE PLATES WITH HIGH STRENGTH FABRIC
PRESTRESSED CONCRETE PLATES WITH HIGH STRENGTH FABRIC H.W. Reinhardt, M. Krueger Constructions Materials Institute, University of Stuttgart, Germany Abstract Tests on fine grain concrete plates with textile
More informationAn application of high performance fiber reinforced cementitious composites for RC beam strengthening
An application of high performance fiber reinforced cementitious composites for RC beam strengthening G. Martinola Concretum Construction Science AG, Switzerland A. Meda University of Bergamo, Italy G.
More informationDESIGN OF STEEL FIBRE REINFORCED CONCRETE BEAMS USING THE NEW FIB MODEL CODE 2010 AN EVALUATIVE
147 Paper No. 739 DESIGN OF STEEL FIBRE REINFORCED CONCRETE BEAMS USING THE NEW FIB MODEL CODE 2010 AN EVALUATIVE AMMAR ABID, K. B. FRANZEN 148 Ammar Abid, K. B. Franzen 72 nd Annual Session of Pakistan
More informationEuropean design codes for FRC structures G. Plizzari
European design codes for FRC structures University of Brescia, Italy giovanni.plizzari@unibs.it Eurocode 2 Annex to EN 1992-1-1 CEN TC 250/SC2/WG1/TG2 SFRC - Steel Fibre Reinforced Concrete This draft
More informationDEVELOPMENT OF ANCHORAGE SYSTEM FOR CFRP SHEET IN STRENGTHENING OF REINFORCED CONCRETE STRUCTURES
DEVELOPMENT OF ANCHORAGE SYSTEM FOR CFRP SHEET IN STRENGTHENING OF REINFORCED CONCRETE STRUCTURES Toshiyuki KANAKUBO 1, Yoshiro ARIDOME 2, Naoto FUJITA 3 And Masaaki MATSUI 4 SUMMARY A strengthening method
More informationFracture behavior of concrete reinforced with basalt fibers
Fracture behavior of concrete reinforced with basalt fibers Mohammed Ishtiyaque #1, M.G. Shaikh *2 #*Applied Mechanics Department, Govt. College of Engineering, Aurangabad -Maharashtra 1 ishtiyaque2011@rediffmail.com,
More informationEffect of Distribution in Cross Sectional Area of Corroded Tensile Reinforcing Bars on Load Carrying Behaviour of RC Beam
Effect of Distribution in Cross Sectional Area of Corroded Tensile Reinforcing Bars on Load Carrying Behaviour of RC Beam Takashi Yamamoto 1*, Satoshi Takaya 1 and Toyo Miyagawa 1 1 Kyoto University, JAPAN
More informationTHE ROLE OF FIBER ORIENTATION ON STRAIN HARDENING/SOFTENING FRCCS: CONTINUUM DAMAGE MODELING
P and 2 nd International RILEM Conference on Strain Hardening Cementitious Composites THE ROLE OF FIBER ORIENTATION ON STRAIN HARDENING/SOFTENING FRCCS: CONTINUUM DAMAGE MODELING Liberato FerraraP (1)
More informationEFFECT OF SHORT METALLIC FIBERS IN MIXED REINFORCED HRFRC BEAMS : AN EXPERIMENTAL STUDY
EFFECT OF SHORT METALLIC FIBERS IN MIXED REINFORCED HRFRC BEAMS : AN EXPERIMENTAL STUDY A.Si-Larbi,E.Ferrier,P.Hamelin Laboratoire Mécanique, matériaux & structures, Université Claude Bernard, Lyon I,
More informationSTRUCTURAL STRENGTHENING WITH FRP AYDIN KHAJEPUR SIKA PARSIAN, TM REFURBISHMENT
STRUCTURAL STRENGTHENING WITH FRP AYDIN KHAJEPUR SIKA PARSIAN, TM REFURBISHMENT OVERVIEW Rigid Bonding Fields of Use Product Range of Sikadur Anchoring Structural Strengthening Reasons for strengthening
More informationTHEORETICAL AND EXPERIMENTAL STUDY OF UNBOUNDED POST-TENSIONED CONTINUOUS SLAB DECKS CONSISTING OF HIGH STRENGTH SCC
CD02-017 THEORETICAL AND EXPERIMENTAL STUDY OF UNBOUNDED POST-TENSIONED CONTINUOUS SLAB DECKS CONSISTING OF HIGH STRENGTH SCC A.A. Maghsoudi 1, M. Torkamanzadeh 2 1 Associate. Prof., Civil Engineering.
More informationCHAPTER 7 ANALYTICAL PROGRAMME USING ABAQUS
87 CHAPTER 7 ANALYTICAL PROGRAMME USING ABAQUS 7.1 GENERAL With the advances in modern computing techniques, finite element analysis has become a practical and powerful tool for engineering analysis and
More informationCIC2014. Concrete Innovation Conference
CIC2014 Concrete Innovation Conference THE 1ST CONCRETE INNOVATION CONFERENCE (CIC) OSLO 11TH - 13TH OF JUNE, 2014 The 1st CIC, 11 th 13 th June, 2014, Oslo, Norway Paper 18 FIBER GLASS REINFORCEMENT FOR
More informationNonlinear Analysis of Shear Dominant Prestressed Concrete Beams using ANSYS
Nonlinear Analysis of Shear Dominant Prestressed Concrete Beams using ANSYS Job Thomas Indian Institute of Science, Bangalore, India Ananth Ramaswamy Indian Institute of Science, Bangalore, India Abstract
More informationBS EN :2004 EN :2004 (E)
Contents List 1. General 1.1 Scope 1.1.1 Scope of Eurocode 2 1.1.2 Scope of Part 1-1 of Eurocode 2 1.2 Normative references 1.2.1 General reference standards 1.2.2 Other reference standards 1.3 Assumptions
More informationST7008 PRESTRESSED CONCRETE
ST7008 PRESTRESSED CONCRETE QUESTION BANK UNIT-I PRINCIPLES OF PRESTRESSING PART-A 1. Define modular ratio. 2. What is meant by creep coefficient? 3. Is the deflection control essential? Discuss. 4. Give
More informationThe Hashemite University Department of Civil Engineering. Dr. Hazim Dwairi. Dr. Hazim Dwairi 1
Department of Civil Engineering Lecture 2.1 Methods of Prestressing Advantages of Prestressing Section remains uncracked under service loads Reduction of steel corrosion (increase durability) Full section
More informationTests of R/C Beam-Column Joint with Variant Boundary Conditions and Irregular Details on Anchorage of Beam Bars
October 1-17, 8, Beijing, China Tests of R/C Beam-Column Joint with Variant Boundary Conditions and Irregular Details on Anchorage of Beam Bars F. Kusuhara 1 and H. Shiohara 1 Assistant Professor, Dept.
More informationAFRP retrofitting of RC structures in Japan
AFRP retrofitting of RC structures in Japan H. Shinozaki Civil Engineering R&D Department, Sumitomo Mitsui Construction Corporation, Japan G.R. Pandey School of Engineering, James Cook University, Australia
More informationLONG-TERM BEHAVIOUR COMPOSITE GIRDERS AND BEHAVIOUR UNDER SERVICE LOAD OF
2006/2 PAGES 14 27 RECEIVED 12. 3. 2006 ACCEPTED 15. 4. 2006 V. BORZOVIČ LONG-TERM BEHAVIOUR COMPOSITE GIRDERS AND BEHAVIOUR UNDER SERVICE LOAD OF ABSTRACT Viktor Borzovič, PhD. Research field: Concrete
More informationStrengthening of hollow core precast slabs using FRP composite materials procedure, testing and rating
Strengthening of hollow core precast slabs using FRP composite materials procedure, testing and rating FLORUŢ SORIN-CODRUŢ*, NAGY-GYÖRGY TAMÁS*, STOIAN VALERIU*, DIACONU DAN* * Department of Civil Engineering
More informationIn-plane testing of precast concrete wall panels with grouted sleeve
In-plane testing of precast concrete wall panels with grouted sleeve P. Seifi, R.S. Henry & J.M. Ingham Department of Civil Engineering, University of Auckland, Auckland. 2017 NZSEE Conference ABSTRACT:
More informationThe Joining Method for Permanent Formwork
The Joining Method for Permanent Formwork Q. JIN 1, C.K.Y. Leung 2, and W.L. Chung 3 1,2,3 Department of Civil and Environmental Engineering of HKUST, HKSAR, China ABSTRACT: In this paper, the combined
More informationResearch on Weight Reduction of PC Composite Members Using Ultra High Strength Fiber Reinforced Cementitious Composites (UFC)
Research on Weight Reduction of PC Composite Members Using Ultra High Strength Fiber Reinforced Cementitious Composites (UFC) H. Murata 1), J. Niwa 2), and C. Sivaleepunth 3) 1) Master course 2nd year
More informationREVIEW ON SHEAR SLIP OF SHEAR KEYS IN BRIDGES
REVIEW ON SHEAR SLIP OF SHEAR KEYS IN BRIDGES Benjamin Raison R; Freeda Christy C PG student, School of Civil Engineering, Karunya University. Associate Professor, School of Civil Engineering, Karunya
More information1 Prepared By:Mr.A.Sathiyamoorthy, M.E., AP/Civil
UNIVERSITY QUESTIONS PART A UNIT 1: INTRODUCTION THEORY AND BEHAVIOUR 1. List the loss of prestress. 2. Define axial prestressing. 3. What is the need for the use of high strength concrete and tensile
More informationCHAPTER 5 FINITE ELEMENT MODELLING
53 CHAPTER 5 FINITE ELEMENT MODELLING 5.1 GENERAL Reinforced concrete structures are largely employed in engineering practice in a variety of situations and applications. In most cases these structures
More informationInternational Journal of Scientific & Engineering Research, Volume 5, Issue 7, July-2014 ISSN
ISSN 9-5518 539 JijiBhaskaran P Department of Civil Engineering College of Engineering T, India jiji158@gmail.com Fracture can be defined as the separation of a component into, at least, two parts. Fracture
More informationLarge scale fire test on tunnel segment: Real boundary conditions in order to evaluate spalling sensitivity and fire resistance
MATEC Web of Conferences 6, 04001 (2013) DOI: 10.1051/matecconf/20130604001 C Owned by the authors, published by EDP Sciences, 2013 Large scale fire test on tunnel segment: Real boundary conditions in
More informationBehaviour of deviated CFRP-Strips
Fourth International Conference on FRP Composites in Civil Engineering (CICE2008) 22-24July 2008, Zurich, Switzerland Behaviour of deviated CFRP-Strips M. Hwash 1, J. Knippers 1 & F. Saad 2 1 Institut
More informationSeventh International Symposium on Impact Engineering
MECHANICAL RESPONSE OF HPFRCC IN TENSION AND COMPRESSION AT HIGH STRAIN RATE AND HIGH TEMPERATURE Cadoni E. 1, Bragov A. 2, Caverzan A. 3, di Prisco M. 3, Konstantinov A. 2, Lomunov A. 2 1 Department of
More informationUHPC Connection of Precast Bridge Deck
Jan L. Vitek, Metrostav, a.s. and CTU in Prague Jiri Kolisko, CTU in Prague, Klokner Institute David Citek, CTU in Prague, Klokner Institute Stanislav Rehacek, CTU in Prague, Klokner Institute Robert Coufal,
More informationShear and torsion interaction of hollow core slabs
Competitive and Sustainable Growth Contract Nº G6RD-CT-2001-00641 Shear and torsion interaction of hollow core slabs HOLCOTORS Technical Report 1 Finite element analyses of hollow core units subjected
More informationExperimental and analytical study of the steel-concrete-steel beam under flexural behavior
Experimental and analytical study of the steel-concrete-steel beam under flexural behavior Dr. Amjad Hameed Abdul-Razaq Civil Eng. Dept. College of Engineering, Kufa University Al-Najaf, Iraq E-mail: amjad881980@yahoo.com
More informationContents. Foreword 1 Introduction 1
Contents Notation x Foreword xiii 1 Introduction 1 1.1 Aims of the Manual 1 1.2 Eurocode system 1 1.3 Scope of the Manual 3 1.4 Contents of the Manual 4 1.5 Notation and terminology 4 2 General principles
More informationDamage assessment of hollow core reinforced and prestressed concrete slabs subjected to blast loading
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 199 (2017) 2476 2481 X International Conference on Structural Dynamics, EURODYN 2017 Damage assessment of hollow core reinforced
More informationTENSION AND COMPRESSION TESTING OF FIBRE REINFORCED POLYMER (FRP) BARS
The 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) & The 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015) Joint
More informationEarly age behaviour of fibre reinforced shotcrete
Early age behaviour of fibre reinforced shotcrete J. Sustersic, A. Zajc, R. Ercegovic IRMA Institute for Research in Materials and Applications, Ljubljana, Slovenia V. Jovicic Institute for Mining, Geotechnology
More informationCHAPTER 2 SPECIMEN DETAILS, TEST SETUP AND TESTING PROCEDURE
38 CHAPTER 2 SPECIMEN DETAILS, TEST SETUP AND TESTING PROCEDURE 2.1 GENERAL In the conducted experimental study, three two-dimensional partially infilled RC frames were cast and tested under quasi-static
More informationSHEAR TESTS ON SFR-UHPC I-SHAPED BEAMS WITH OR WITHOUT WEB OPENINGS
SHEAR TESTS ON SFR-UHPC I-SHAPED BEAMS WITH OR WITHOUT WEB OPENINGS Raul Zagon 1, Stijn Matthys 2, Zoltan Kiss 1 1: Faculty of Civil Engineering, Technical University of Cluj Napoca, Dep. of Structures,
More informationAPPENDIX I NASP TEST PROTOCOLS
APPENDIX I NASP TEST PROTOCOLS I-1 I-2 I-3 I-4 NASP STRAND BOND TEST (DRAFT) Standard Test Method to Assess the Bond of 0.5 in. (12.7 mm) and 0.6 in. (15.24 mm) Seven Wire Strand with Cementitious Materials
More informationAN INVESTIGATION OF SEISMIC RETROFIT OF COLUMNS IN BUILDINGS USING CONCRETE JACKET
AN INVESTIGATION OF SEISMIC RETROFIT OF COLUMNS IN BUILDINGS USING CONCRETE JACKET Gnanasekaran, K. 1 and Amlan K. Sengupta 2 1 Ph.D. Scholar, Dept. of Civil Engineering, Indian Institute of Technology
More informationNonlinear Models of Reinforced and Post-tensioned Concrete Beams
111 Nonlinear Models of Reinforced and Post-tensioned Concrete Beams ABSTRACT P. Fanning Lecturer, Department of Civil Engineering, University College Dublin Earlsfort Terrace, Dublin 2, Ireland. Email:
More informationAN ANALYSIS OF MEMBRANE ACTION IN ONE-WAY CONCRETE MEMBERS EXTERNALLY BONDED WITH FRP
The 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) & The 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015) Joint
More informationEXPERIMENTAL ANALYSIS ON THE SHEAR BEHAVIOUR OF RC BEAMS STRENGTHENED WITH GFRP SHEETS
EXPERIMENTAL ANALYSIS ON THE SHEAR BEHAVIOUR OF RC BEAMS STRENGTHENED WITH GFRP SHEETS Ugo Ianniruberto Department of Civil Engineering, University of Rome Tor Vergata, ITALY Via del Politecnico, 1, 00133
More informationCharacteristics of Concrete Based on Red Waste Ceramics and Reinforced by Steel Fibre
Fourth International Conference on Sustainable Construction Materials and Technologies http://www.claisse.info/proceedings.htm SCMT4 Las Vegas, USA, August 7-11, 2016 Characteristics of Concrete Based
More informationPretensioned concrete members are widely used in
Spacing requirements of.7 in. (8 mm) diameter prestressing strands Canh N. Dang, Royce W. Floyd, W. Micah Hale, and J. R. Martí-Vargas The use of.7 in. (8 mm) diameter strands for pretensioned concrete
More informationTHE ROLE OF THE STRUCTURAL CHARACTERISTIC LENGTH IN FRC STRUCTURES
9th International Conference on Fracture Mechanics of Concrete and Concrete Structures FraMCoS-9 V. Saouma, J. Bolander and E. Landis (Eds) DOI 10.21012/FC9.308 THE ROLE OF THE STRUCTURAL CHARACTERISTIC
More informationUltimate strength prediction for reinforced concrete slabs externally strengthened by fiber reinforced polymer (FRP)
Ultimate strength prediction for reinforced concrete slabs externally strengthened by fiber reinforced polymer (FRP) Abstract This paper presents the potential use of externally bonded fiber reinforced
More informationISSN: [Mathur* et al., 6(1): January, 2017] Impact Factor: 4.116
IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY CHEMICAL & ELECTRICAL METHOD IN POST TENSIONING OF PRE- STRESSING CAN BE USED FOR MAKING DUCKED THROUGH STRUCTURAL ELEMENT AFTER
More informationFIBRE REINFORCED CONCRETE FOR PRECAST TUNNEL SEGMENTS
FIBRE REINFORCED CONCRETE FOR PRECAST TUNNEL SEGMENTS Jan L. Vítek 1, Matouš Hilar 2, Petr Vítek 3 Abstract: Fibre reinforced concrete is a promising material for application in precast concrete tunnel
More informationChapter 7. Finite Elements Model and Results
Chapter 7 Finite Elements Model and Results 7.1 Introduction In this chapter, a three dimensional model was presented. The analytical model was developed by using the finite elements method to simulate
More informationComposite Structures made of Ultra-High Performance Concrete and Carbonfiber-Reinforced Polymers
9 th fib International PhD Symposium in Civil Engineering, Karlsruhe, Germany, July 22 th 25 th 2012 Composite Structures made of Ultra-High Performance Concrete and Carbonfiber-Reinforced Polymers Dipl.-Ing
More informationEVALUATION ON SHEAR CAPACITY OF RC BEAMS USING U-SHAPED UFC PERMANENT FORMWORK
- Technical Paper - EVALUATION ON SHEAR CAPACITY OF RC BEAMS USING U-SHAPED PERMANENT FORMWORK Puvanai WIROJJANAPIROM *1, Koji MATSUMOTO *2, Katsuya KONO *3 and Junichiro NIWA *4 ABSTRACT Shear resistance
More informationTension and compression testing of fibre reinforced polymer (FRP) bars
University of Wollongong Research Online Faculty of Engineering and Information Sciences - Papers: Part A Faculty of Engineering and Information Sciences 2015 Tension and compression testing of fibre reinforced
More informationLevel 6 Graduate Diploma in Engineering Structural analysis
9210-111 Level 6 Graduate Diploma in Engineering Structural analysis Sample Paper You should have the following for this examination one answer book non-programmable calculator pen, pencil, ruler, drawing
More informationInvestigations on Tensile Properties of High Strength Steel Fibre Reinforced Concrete
Indian Journal of Science and Technology, Vol 8(28), DOI: 10.17485/ijst/2015/v8i28/84092, October 2015 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645 Investigations on Tensile Properties of High Strength
More informationCharacterization and Testing of Fiber Reinforced Concrete (American Standards)
Workshop on FIBER REINFORCED CONCRETE (FRC): MATERIALS, APPLICATIONS AND DESIGN ASPECTS UNIVERSITY OF SHARJAH, UNITED ARAB EMIRATES 22-23 APRIL 2018 Characterization and Testing of Fiber Reinforced Concrete
More informationDUCTILITY AND STRENGTH IN HIGH-PERFORMANCE LIGHTWEIGTH CONCRETE COLUMNS
13 th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 1-6, 24 Paper No. 3414 DUCTILITY AND STRENGTH IN HIGH-PERFORMANCE LIGHTWEIGTH CONCRETE COLUMNS Dante GALEOTA 1, Matteo M.
More informationASSIGNMENT 1 ANALYSIS OF PRESTRESS AND BENDING STRESS BFS 40303
Instruction : Answer all question ASSIGNMENT 1 ANALYSIS OF PRESTRESS AND BENDING STRESS BFS 40303 1. A rectangular concrete beam, 100 mm wide by 250 mm deep, spanning over 8 m is prestressed by a straight
More informationImprovement of Mechanical Performance in Different Concrete Applications through Use of Steel Fibers
Fourth International Conference on Sustainable Construction Materials and Technologies http://www.claisse.info/proceedings.htm SCMT4 Las Vegas, USA, August 7-11, 216 Improvement of Mechanical Performance
More informationSEISMIC RETROFIT OF BEAM-COLUMN JOINTS WITH FRP SHEETS
B-4 ADVANCED COMPOSITE MATERIALS IN BRIDGES AND STRUCTURES MATÉRIAUX COMPOSITES D'AVANT GARDE POUR PONTS ET CHARPENTES Winnipeg, Manitoba, Canada, September 22 24, 28 / 22, 23 et 24 septembre 28 SEISMIC
More informationSHEAR BEHAVIOR OF RC BEAMS USING U-SHAPED UFC PERMANENT FORMWORK WITH SHEAR KEYS OR BOLTS
- Technical Paper - SHEAR BEHAVIOR OF BEAMS USING U-SHAPED PERMANENT FORMWORK WITH SHEAR KEYS OR BOLTS Puvanai WIROJJANAPIROM *1, Koji MATSUMOTO *2, Katsuya KONO *3 and Junichiro NIWA *4 ABSTRACT Shear
More informationSeismic response of corroded r.c. structures
Tailor Made Concrete Structures Walraven & Stoelhorst (eds) 2008 Taylor & Francis Group, London, ISBN 978-0-415-47535-8 Seismic response of corroded r.c. structures Anna Saetta & Paola Simioni Department
More informationPROPERTIES OF LATEX FERROCEMENT IN FLEXURE
PROPERTIES OF LATEX FERROCEMENT IN FLEXURE Fahrizal Zulkarnain 1, Mohd. Zailan Suleiman 2 1 PhD Candidate, School of Housing, Building and Planning, Universiti Sains Malaysia 2 Lecturer, School of Housing,
More informationBEHAVIOR OF INFILL MASONRY WALLS STRENGTHENED WITH FRP MATERIALS
BEHAVIOR OF INFILL MASONRY WALLS STRENGTHENED WITH FRP MATERIALS D.S. Lunn 1,2, V. Hariharan 1, G. Lucier 1, S.H. Rizkalla 1, and Z. Smith 3 1 North Carolina State University, Constructed Facilities Laboratory,
More informationBasic quantities of earthquake engineering. Strength Stiffness - Ductility
Basic quantities of earthquake engineering Strength Stiffness - Ductility 1 Stength is the ability to withstand applied forces. For example a concrete element is weak in tension but strong in compression.
More informationCHAPTER 3: DESIGN VALUES FOR MATERIALS
CHAPTER 3: DESIGN VALUES FOR MATERIALS 3.1 GENERAL (1) The quality of concrete and reinforcing materials are expressed, in addition to compressive strength and tensile strength, in terms of material characteristics
More informationFire behaviour of HPLWC hollow core slabs: full scale furnace tests and numerical modelling
Fire behaviour of HPLWC hollow core slabs: full scale furnace tests and numerical modelling Annibale Luigi MATERAZZI Professor University of Perugia Perugia, ITALY Marco BRECCOLOTTI Assistant Researcher
More informationInnovative procedure to produce high performance pretensioned concrete girders combining high strength concrete and normal or special concrete types
High Performance Structures and Materials III 401 Innovative procedure to produce high performance pretensioned concrete girders combining high strength concrete and normal or special concrete types C.
More informationTHE PERFORMANCE OF CONCRETE GROUND FLOOR SLAB REINFORCEMENT TO CONTROL SHRINKAGE CRACKING. D H Chisholm 1
THE PERFORMANCE OF CONCRETE GROUND FLOOR SLAB REINFORCEMENT TO CONTROL SHRINKAGE CRACKING D H Chisholm 1 ABSTRACT In a typical residential concrete floor slab, the cast in strip footings on the slab perimeter
More informationDesigning cast-in-situ FRC tunnel linings
Tailor Made Concrete Structures Walraven & Stoelhorst (eds) 2008 Taylor & Francis Group, London, ISBN 978-0-415-47535-8 Designing cast-in-situ FRC tunnel linings B. Chiaia, A.P. Fantilli & P. Vallini Politecnico
More informationBUILDING STRUCTURES WITH GRC. FERNANDO A. BRANCO, JOÃO FERREIRA, JORGE DE BRITO and JOSÉ R. SANTOS
CIB World Building Congress, April 2001, Wellington, New Zealand Page 1 of 11 BUILDING STRUCTURES WITH GRC FERNANDO A. BRANCO, JOÃO FERREIRA, JORGE DE BRITO and JOSÉ R. SANTOS Civil Engineering Department,
More informationRESILIENT INFRASTRUCTURE June 1 4, 2016
RESILIENT INFRASTRUCTURE June 1 4, 2016 MOMENT REDISTRIBUTION OF GFRP-RC CONTINUOUS T-BEAMS S. M. Hasanur Rahman M.Sc. Student, University of Manitoba, Canada Ehab El-Salakawy Professor and CRC in Durability
More informationFracture Study on Steel Fibre Reinforced Concrete
Fracture Study on Steel Fibre Reinforced Concrete Arjun T S 1, Divya K K 2 1 (Department of Civil Engineering, SNGCE, India) 2 (Department of Civil Engineering, SNGCE, India) Abstract: Concrete is a composite
More informationINVESTIGATION ON PERFORMANCE OF HYBRID FIBRE IN REINFORCED CONCRETE
ISSN: 2347-97X (online) INVESTIGATION ON PERFORMANCE OF HYBRID FIBRE IN REINFORCED CONCRETE Dr.R.Rameshkumar Department of Automobile Engineering, K.S.R College of Engineering, Tiruchengode, TN, India
More informationPunching shear behavior of Lightweight foamed RC slabs
Punching shear behavior of Lightweight foamed RC slabs A.A. Zaher 1, A.A. Abdelrahman 2, A. S. Eldeib 3, A.A. Mohamed 3 1 Faculty of Engineering (Civil), Ain Shams University, Cairo, Egypt 2 Faculty of
More informationPULLOUT CAPACITY BEHAVIOUR OF FRP-HEADED REBARS
PULLOUT CAPACITY BEHAVIOUR OF FRP-HEADED REBARS Hamdy M. Mohamed NSERC Post-Doctoral Fellow University of Sherbrooke Sherbrooke, Quebec, Canada. Hamdy.Mohamed@usherbrooke.ca Brahim Benmokrane Professor
More informationNonlinear Finite Element Analysis of Composite Cantilever Beam with External Prestressing
Nonlinear Finite Element Analysis of Composite Cantilever Beam with External Prestressing R. I. Liban, N. Tayşi 1 Abstract This paper deals with a nonlinear finite element analysis to examine the behavior
More informationCRACKING BEHAVIOR AND CRACK WIDTH PREDICTIONS OF CONCRETE BEAMS PRESTRESSED WITH BONDED FRP TENDONS
CRACKING BEHAVIOR AND CRACK WIDTH PREDICTIONS OF CONCRETE BEAMS PRESTRESSED WITH BONDED FRP TENDONS Weichen XUE Professor Tongji University Siping Road 1239#, Shanghai 200092, China xuewc@tongji.edu.cn*
More informationCHAPTER 8 FLEXURAL BEHAVIOUR OF FIBRE REINFORCED GEOPOLYMER COMPOSITE R.C. BEAMS
170 CHAPTER 8 FLEXURAL BEHAVIOUR OF FIBRE REINFORCED GEOPOLYMER COMPOSITE R.C. BEAMS 8.1 GENERAL An experimental investigation on the behaviour of geopolymer composite concrete beams reinforced with conventional
More informationAPPLICATION OF EXPANSIVE AGENT (EA) TO PRODUCE POST TENSIONING FORCE IN FRP JACKETS FOR LATERAL RETROFITTING OF RC COLUMNS
CD04-002 APPLICATION OF EXPANSIVE AGENT (EA) TO PRODUCE POST TENSIONING FORCE IN FRP JACKETS FOR LATERAL RETROFITTING OF RC COLUMNS A.A.Mortazavi 1, M.Jalal 2, M.M.Khodaparast 3 1. Associate professor,
More informationEffect of Fly Ash On Elastic Properties Of Self Compacting Concrete With Prestressing
Effect of Fly Ash On Elastic Properties Of Self Compacting Concrete With Prestressing 1 Mr.Tushar Harihar Sonawane, 2 Prof. Yuvraj L. Bhirud 1 Lecturer, 2 Associate Professor and Head 1 Civil Engineering
More informationRESILIENT INFRASTRUCTURE June 1 4, 2016
RESILIENT INFRASTRUCTURE June 1 4, 2016 EFFECT OF CONCRETE STRENGTH ON THE PUNCHING SHEAR BEHAVIOUR OF GFRP-RC SLAB-COLUMN EDGE CONNECTIONS Ahmed M. Mostafa MSc Student, University of Manitoba, Canada
More informationStress Redistribution of Concrete Prisms Due to Creep and Shrinkage: Long- Term Observations and Analysis
CONCREEP 10 138 Stress Redistribution of Concrete Prisms Due to Creep and Shrinkage: Long- Term Observations and Analysis P. Criel 1 ; R. Caspeele 1 ; N. Reybrouck 1 ; S. Matthys 1 ; and L. Taerwe 1 1
More informationDevelopment on precast PC slab with a new type of joint for reinforcing bars, combination of lap splice and mechanical anchorage
Development on precast PC slab with a new type of joint for reinforcing bars, combination of lap splice and mechanical anchorage Kengo Hara 1*, Hiroyuki Abe 1, Satoshi Otani 1 and Meguru Tsunomoto 1 1
More informationINFLUENCE OF PRSTRESS LEVEL ON SHEAR BEHAVIOR OF SEGMENTAL CONCRETE BEAMS WITH EXTERNAL TENDONS
- Technical Paper - INFLUENCE OF PRSTRESS LEVEL ON SHEAR BEHAVIOR OF SEGMENTAL CONCRETE BEAMS WITH EXTERNAL TENDONS Dinh Hung NGUYEN *1, Ken WATANABE *2, Junichiro NIWA *3 and Tsuyoshi HASEGAWA *4 ABSTRACT
More informationInfluence of Steel Fibres and Matrix Composition on The Properties of UHPFRC
Influence of Steel Fibres and Matrix Composition on The Properties of UHPFRC Kim Huy Hoang, Philipp Hadl, Nguyen Viet Tue Institute of Structural Concrete, Graz University of Technology, Austria Abstract:
More informationBENDING BEHAVIOR OF PRECAST BRIDGE SLABS IN UHPFRC UNDER STATIC AND CYCLIC LOADINGS
BENDING BEHAVIOR OF PRECAST BRIDGE SLABS IN UHPFRC UNDER STATIC AND CYCLIC LOADINGS J.-P. Charron, F. Lachance and B. Massicotte Research Center on Concrete Infrastructures (CRIB), Polytechnique Montreal,
More informationUsability s Perspectives of Recycled Aggregate Concretes (RAC) for Structural Applications
Usability s Perspectives of Recycled Aggregate Concretes (RAC) for Structural Applications MARIO BASSAN, FULL PROFESSOR MARCO QUATTRONE, ENG. PHD CANDIDATE VITTORIO BASILICO, DR. ENG. Wascon 2009 Lyon
More informationFagà, Bianco, Bolognini, and Nascimbene 3rd fib International Congress
COMPARISON BETWEEN NUMERICAL AND EXPERIMENTAL CYCLIC RESPONSE OF ALTERNATIVE COLUMN TO FOUNDATION CONNECTIONS OF REINFORCED CONCRETEC PRECAST STRUCTURES Ettore Fagà, Dr, EUCENTRE, Pavia, Italy Lorenzo
More information