PRESENTATION OF NIKER EU PROJECT

Transcription

1 ENGINEER S SEMINAR: HISTORIC BUILDINGS AND EARTHQUAKE DECEMBER 2011, MIKVE ISRAEL, ISRAEL SPEAKER: & FRANCESCA DA PORTO DEPARTMENT OF STRUCTURAL & TRANSPORTATIONS ENGINEERING UNIVERSITY OF PADOVA, ITALY

2 Post-earthquake survey of damages after seismic event allowed the scientific community to understand the drawback and limitation of the state-of-the-art technologies and approaches applied at the time. INTRODUCTION

3 INTRODUCTION Some defects that make useless the effects of the interventions and even increase the vulnerability of Cultural Heritage assests can arise for various reasons. Inadequate intervention: infinitely rigid diaphragms at roof level Inadequate analysis of historic structures Use of Inadequate materials that give rise to chemical, physical and mechanical incompatibility

4 Proposes the development of a new integrated methodology for solving the problems, aiming at improving the general safety level and for reducing the loss of artistic value. INNOVATION IN THE FOLLOWING AREAS Materials and techniques for intervention Studies and techniques for structural connections Testing and sub-structuring test methods Optimization approach for CH buildings Monitoring and early warning systems Integrated, multidisciplinary approach for CH Standardization NIKER PROJECT

5 WP1: Project management WP2: Dissemination and exploitation PROJECT STRUCTURE WP3: Damage based selection of technologies WP4: Optimization of design for vertical elements WP5: Optimization of design for floors roofs and vaults WP8: Parametric modelling of structural behaviour WP6: Connections and dissipative systems with early warning WP7: Systemic improvement of seismic response WP9: Knowledge based assessment WP10: Guidelines for endusers

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7 WP3 - DAMAGE BASED SELECTION OF TECHNOLOGIES MAIN SCIENTIFIC AND TECHNICAL OBJECTS New structured database on earthquake induced failure mechanisms, construction types and materials, interventions and assessment techniques.

8 WP3 - DAMAGE BASED SELECTION OF TECHNOLOGIES MAIN SCIENTIFIC AND TECHNICAL OBJECTS New structured database on earthquake induced failure mechanisms, construction types and materials, interventions and assessment techniques.

9 MAIN SCIENTIFIC AND TECHNICAL OBJECTS Development of materials and techniques for intervention on structural elements (WP3; WP4; WP5), based on: Construction material Construction type Environmental conditions Innovation also within tradition

10 PROJECT RESULTS - WP3 D3.1 Inventory of earthquake-induced failure mechanisms related to construction types, structural elements, and materials D3.2 Critical review of retrofitting and reinforcement techniques related to possible failure mechanisms and requirements D3.3 Critical review of methodologies and tools for assessment of failure mechanisms and interventions D3.4 Critical review for the onsite control of the repair technique and interventions

11 WP4 - OPTIMIZATION OF DESIGN FOR VERTICAL ELEMENTS Injection with nano-hydraulic-limes, micro-silica, earthen grouts Repointing and reinforced repointing FRP-SRP/SRG application Glass fibre, geo textiles and stainless steel elements MAIN SCIENTIFIC AND TECHNICAL OBJECTS Technological solutions for vertical elements: walls and pillars, with compatibility, durability, effectiveness, feasibility and design related issues, based on:

12 Earthen walls under static and cyclic loading PROJECT RESULTS - WP4 - BAM Static experiments on small sized wall segments Earth block (adobe) Rammed earth Cob

13 STONE MASONRY WALLS PROJECT RESULTS - WP4 - UNIPD The static tests are composed essentially by simple compression test and shearcompression in-plane cyclic tests on reinforced and unreinforced stone masonry panels which allow characterizing the complex mechanical behavior of this material and elements, extremely useful for the numerical simulation of this type of material and structure. Simple Compression Tests Shear-Compression Tests

14 Half-timbered walls PROJECT RESULTS - WP4 - UMINHO A varying vertical pre-compression will be applied, namely 90, 120 and 150kN, to be divided in the vertical posts Reinforcement will be applied on the tested walls in terms of additional nails or screws, steel plates, GFRP or TRM.

15 WP5 - OPTIMIZATION OF DESIGN FOR FLOORS, ROOF AND VAULTS MAIN SCIENTIFIC AND TECHNICAL OBJECTS Technological solutions for horizontal elements: floors, roofs and vaults, with compatibility, durability, effectiveness, feasibility and design related issues, based on: Bracing with FRP and SRP strips for floors and roofs Dry wood-to-wood techniques for floors Reinforced transverse vertical diaphragms for vaults FRP and SRP application, special alloys ties and anchors Pins and grouting mortars in horizontal earthen elements

16 FM SB FM FM +45 SP(40) FM+45 SP(25) FM +45 SP(33) FM ±45 DP(25) FM Wood D(25) FM SRP D FM CFRP D FM Steel D FM Wood D(50) FM net HV FM net HE FM net Wood D(50) Fmax [kn] WP5 - EXPERIMENTAL RESULTS PROJECT RESULTS - WP5 - UNIPD In-plane monotonic and cyclic tests on unreinforced and reinforced timber floors Results - Examples Fmax - PLANKINGS DIAGONALS NET

17 WP5 - EXPERIMENTAL RESULTS PROJECT RESULTS - WP5 - ITAM In-plane cyclic tests on timber ceilings in original and strengthened conditions Results - Bare timber Hysteresis curves Results - Wooden ceiling (timber) with the rammed earth floor

18 WP5 - EXPERIMENTAL RESULTS PROJECT RESULTS - WP5 - MINHO Loading tests on reinforced and unreinforced wooden trusses Full scale tests The truss showed an elasticplastic and relatively symmetrical response to the applied loads.

19 WP5 - EXPERIMENTAL RESULTS PROJECT RESULTS - WP5 - UBATH Testing setup - Arches on spreading supports Single ring of recycled Victorian bricks and NHL 5 lime mortar. Arch span: 2.0 m Arch rise: 0.5 m f c : 5.5/6.0 MPa f t : 0.18/0.20 MPa Sliding abutment. Movement is controlled by hydraulic jack that is released while the arch is loaded by adding weights on top Fixed abutment

20 MAIN SCIENTIFIC AND TECHNICAL OBJECTS WP6 CONNECTIONS AND DISSIPATIVE SYSTEM WITH EARLY WARNING Techniques for connections: wall-to-wall; floor-to-wall; roof-to-wall: Corner confinement with FRP/SRP/SRG Steel angle connections or steel bed joint repointing Dissipative device and sensoring system in anchors

21 Stress [MPa] Load [kn] WP6 - EXPERIMENTAL RESULTS PROJECT RESULTS - WP5 - UBATH Strain [10e-6] Dissipative element Anchorage Dissipative element - FE Anchorage - FE Pull-out - Standard 20 Pull-out - Yielding No 1 10 FE - 2D with substrata Displacement [mm]

22 WP7 - SYSTEMIC IMPROVEMENT OF OVERALL SEISMIC RESPONSE MAIN SCIENTIFIC AND TECHNICAL OBJECTS Characterization of the seismic behaviour of original substructures and substructures strengthened with integrated interventions by shaking table tests (WP7).

23 WP7 - SYSTEMIC IMPROVEMENT OF OVERALL SEISMIC RESPONSE MAIN SCIENTIFIC AND TECHNICAL OBJECTS Two building models were realized with both the same materials and geometry. Reducing scale factor: 2:3 Masonry thickness: 0.33m Floor Dimensions: 2.40mx2.8m Overall height: 3.60m Regular openings Timber beams Double planking wooden floors Insertion of steel tie rods 1. First model to be initially tested in unstrengthened conditions 2. Second model to be strengthened through injection before the test

24 Stress [MPa] WP7 - SYSTEMIC IMPROVEMENT OF OVERALL SEISMIC RESPONSE MAIN SCIENTIFIC AND TECHNICAL OBJECTS Characterization of the seismic behaviour of original substructures and substructures strengthened with integrated interventions by shaking table tests (WP7) Connection Dissipative element -300 Strain [10e-6]

25 WP7 - SYSTEMIC IMPROVEMENT OF OVERALL SEISMIC RESPONSE MAIN SCIENTIFIC AND TECHNICAL OBJECTS Integration, validation and assessment of intervention techniques by evaluation of overall seismic response of model buildings on shaking table (WP7).

26 WP8 PARAMETRIC MODELLING OF STRUCTURAL BEHAVIOUR Reliable models for connections and substructures Parametric assessment for identifying interactions Sensitivity study to quantify building seismic performance and response parameters Optimized performance based design procedures MAIN SCIENTIFIC AND TECHNICAL OBJECTS

27 Ag[g] WP8 PARAMETRIC MODELLING OF STRUCTURAL BEHAVIOUR Reliable models for connections and substructures Parametric assessment for identifying interactions Sensitivity study to quantify building seismic performance and response parameters Optimized performance based design procedures (WP8) MAIN SCIENTIFIC AND TECHNICAL OBJECTS 0,3 Th_7 0,2 0, ,1-0,2-0,3 Time [s]

28 MAIN SCIENTIFIC AND TECHNICAL OBJECTS WP9 KNOWLEDGE BASED ASSESSMENT Calibration of innovative measuring devices or systems, and on-site application for: assessment of local and global behaviour early warning model calibration quality assessment and long-term check of effectiveness (WP9)

29 Integrated methodologies that include: i) monitoring (from WP9) ii) reliable structural models (from WP8-WP9) LIVERABLES YEAR 1 YEAR 2 YEAR 3 ILESTONES PM 1 PM 2 PM 3 PM 4 PM 5 PM 6 PM 7 PM 8 PM 9 PM 10 PM 11 PM 12 PM 13 PM 14 PM 15 PM 16 PM 17 PM 18 PM 19 PM 20 PM 21 PM 22 PM 23 PM 24 PM 25 PM 26 PM 27 PM 28 PM 29 PM 30 PM 31 PM 32 PM 33 PM 34 PM 35 PM 36 M1 M2 D 1.1 iii) Start selection, D 1.1 design, and application of minimized interventions (from WP3 to WP8)...M2 1.2, 1.3, 1.4, of.5, 1.6, 1.7 D 1.2 D 1.3 D 1.4 D 1.5 D 1.6 D 1.7 iv) evaluation of execution of intervention (from WP4 to WP7 and WP9) M3 M5... v) step-by-step procedure in the application of interventions (from WP9) PROJECT PLAN 2.3 & D 2.7 Start D 2.3 D , 2.2, 2.4, of D 2.1 D 2.2 D 2.4 D 2.5 D 2.6 D 2.8.5, 2.6 & 2.8 WP 2...M5; M18 M4 M6 M7 D 3.1 D 3.1 D 3.2 D 3.2 D 3.3 Start D 3.3 D 3.4 of D 3.4 D 3.5 WP 3 D 3.5 D 3.6 D 3.6 D 3.7 D 3.7 M8 M11 D 4.1 D 4.1 D 4.2 Start D 4.2 D 4.3 of D 4.3 D 4.4 WP 4 D 4.4 D 4.5 D 4.5 M8 M11 D 5.1 D 5.1 D 5.2 Start D 5.2 D 5.3 of D 5.3 D 5.4 WP 5 D 5.4 D 5.5 D 5.5 M9 M12 D 6.1 D 6.1 D 6.2 Start D 6.2 D 6.3 of D 6.3 D 6.4 WP 6 D 6.4 D 6.5 D 6.5 M10 M14 D 7.1 D 7.1 D 7.2 Start D 7.2 D 7.3 of D 7.3 D 7.4 WP 7 D 7.4 D 7.5 D 7.5 M13 M15 D 8.1 D 8.1 Start D 8.2 D 8.2 of D 8.3 D 8.3 WP 8 D 8.4 D 8.4 D 9.1 D 9.1 D 9.2 Start D 9.2 D 9.3 of D 9.3 D 9.4 WP 9 D 9.4 D 9.5 D 9.5 M17 D 10.1 D 10.1 D 10.2 Start D 10.2 D 10.3 pf D 10.3 D 10.4 WP 10 D 10.4 D 10.5 D 10.5 M16

30 WP10 GUIDELINES FOR END-USERS IMPLEMENTATION THE RESULTS INTO GUIDELINES simplified for the needs of the end-users and designers provide simple design rules, design formulations and design charts indicate materialization procedures and costs of interventions support assessment of single elements, connections & structure support passive interventions for improving earthquake resistance advice the best choice and application of active devices exploit and promote integrated methodologies The guidelines will compose a series of documents furnished with: a clear navigation system sorted according to o materials and their vulnerability o structures and their vulnerability o specific problems (including site and interactions) o time of intervention (retrofitting, repair,.) a rich illustration of practical examples and instructions reference to codes references to further reading, ongoing research and suppliers

31 PARTNERSHIP PROJECT COORDINATOR: UNIVERSITY OF PADOVA ITALY

32 WP leaders European Commission COORDINATION STRUCTURE Project management Steering Committee (SC) UMINHO POLIMI BAM UBATH WP2 WP8 WP3 WP4 WP6 Information feedback Reporting Project coordinator (Coo) WP1 Coordinating progress UNIPD WP5 Project progress Consortium Participant Plenum (CPP) NTUA UPC ITAM WP7 WP9 WP10 Reporting progress

33 EXPECTED IMPACT AND EU POLICIES Environment, Health and Sustainable development impact on protection of Cultural Heritage impact on safety and quality of life Growth and Jobs impact on competitivness of SMEs and Industry impact on employment and the use/development of skills impact mainly on construction and tourism sectors Better Regulation contribution to standards Climate, Energy, minimization of interventions and targeted, sequential implementation European Neighbourhood Policy and Regional Policy participation of ACs, ICPCs and MPCs and less advanced areas of the EU Nanotechnologies, Tourism

34 ENGINEER S SEMINAR: HISTORIC BUILDINGS AND EARTHQUAKE DECEMBER 2011, MIKVE ISRAEL, ISRAEL THANK YOU! SPEAKER: DEPARTMENT OF STRUCTURAL & TRANSPORTATIONS ENGINEERING UNIVERSITY OF PADOVA, ITALY