European Construction Technology Platform
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1 European Construction Technology Platform Present and future in the design, construction and maintenance of bridges Prof. Giuseppe Mancini Versailles 2006, November, 21 st 22 nd
2 Marcus Vitruvius Pollio Art of Building Firmitas Utilitas Venustas Robustness and safety Serviceability and functionality Elegange and beauty Prof. Giuseppe Mancini
3 After more than twenty centuries those principles are still valid, although the increased importance of economy A new more general concept has been focused during the last two decades Sustainability Prof. Giuseppe Mancini
4 Construction process has been substantially influenced by sustainability concept (fib, Bull. 28) Resources Resources Cost Quality Environmental issues Culturalsocial aspects Time Economic constraint Emissions Biodiversity Emissions Biodiversity Prof. Giuseppe Mancini
5 Sustainability: Satisfaction of the needs of the present without compromising the ability of future generations to meet their own needs Analysis of complete life-cycle Durability Prof. Giuseppe Mancini
6 New trend for the future Design for durability Verification of Robustness Safety Serviceability Prof. Giuseppe Mancini
7 Guidance paper for durability fib Model Code for Service Life Design (Bulletin 34 February 2006) Four options Full probabilistic design approach Partial factor design approach Deemed to satisfty design approach Avoidance of deterioration design approach Prof. Giuseppe Mancini
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9 Main parameters influencing durability Conceptual design Detailed design Technology concept Construction process Use Maintenance Repair Design Construction Utilization Prof. Giuseppe Mancini
10 A typical engineering approach Learn by the past experience For the future avoid to spend the resources essentially in repairing the effect of the errors of the past Prof. Giuseppe Mancini
11 Present and near future for bridges A lot of investments in repair, strengthening upgrading of existing bridges Significant amount of investments in new bridges Avoid to repeat the errors made in the past Prof. Giuseppe Mancini
12 A case study of damaged piers (H= 150 m, built in 1973) Construction with self-launching formwork (3 m/day, continous launching, wrong mix design) Cover cracked and very permeable Spalling and reinforcement corrosion Carbonation Chlorides attack Prof. Giuseppe Mancini
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16 Spider system suspending the facilities from the top of the pier Hydrodemolition (60 80 mm; p= bars) Adding of reinforcement Casting ( mm) with S.C.C. (pumped from the bottom) reconstruction speed: 1.8 m/day Prof. Giuseppe Mancini
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26 A case study of damaged beams a) Very thin webs in combination with pretensioned and postensioned prestressing Explosion of the web Prof. Giuseppe Mancini High stress level in compressed stress field Fatigue Tensile stresses transversely to the tendon profile, without local reinforcement
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30 b) Tendons corrosion by insufficient or missing grouting Now a fib document available (Boulletin 33, December 2005) Adding of external prestressing Prof. Giuseppe Mancini
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36 Improuvement of durability aesthetics in small span recent bridges Continuity Prestressing protected with plastic ducts (HDPE) Massive structures (cast in situ slabs) Prof. Giuseppe Mancini
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52 Continous beams (current span m) Box girder section Prof. Giuseppe Mancini
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59 18 External tendons 19φ0.6 A A Prof. Giuseppe Mancini
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76 A recent solution for spans up to m Composite box girder deck whit external prestressing Prof. Giuseppe Mancini
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79 Advantages Velocity in construction Economy Durability External prestressing 15% reduction of dead weight Prof. Giuseppe Mancini
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95 Conclusions Sustainability Durability Full integration Research Design Construction Prof. Giuseppe Mancini
96 New solutions for concrete bridges using the composition with steel Composite box girder (slabs in concrete) External prestressing Corrugated webs Prof. Giuseppe Mancini
97 Himi bridge Structural Concrete Vol. 7, n. 3, September 2006 Prof. Giuseppe Mancini
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99 Thank you for the kind attention Prof. Giuseppe Mancini
PRESTRESSED COMPOSITE BOX GIRDER BRIDGES
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The 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
fib publications Oppdatert November 2018:
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fib publications - Pr.November 2017:
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