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Shear capacity of slabs under a combination of loads

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presentation given at the 2013 fib symposium

presentation given at the 2013 fib symposium

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  • 1. Challenge the futureDelftUniversity ofTechnologyShear capacity of slabsunder a combination of loadsEva Lantsoght, Cor van der Veen, Joost Walraven
  • 2. 2Shear capacity of slabs under a combination of loadsOverview• Introduction• Recommendations from previousexperiments• Hypothesis of superposition• Experiments• Results• Superposition• Support material• Comparison to proposed method• ConclusionsS9T6 at failure
  • 3. 3Shear capacity of slabs under a combination of loadsIntroduction: Recommendations (1)• Based on experiments on slabs under a concentrated load• Evaluating existing solid slab bridges:• EN 1992-1-1:2005• 25% reduction of contribution concentrated load close to support• β =av /2dl• Combined: βnew =av /2,5dl• Effective width: French method and minimum 4dl
  • 4. 4Shear capacity of slabs under a combination of loadsIntroduction: Recommendations (2)45 load spreading 45 load spreading – French practice
  • 5. 5Shear capacity of slabs under a combination of loadsHypothesis of superposition• Concentrated load over effective width• Distributed loads over full width• Sum of stresses with combination of loads ≥ stress withconcentrated load only
  • 6. 6Shear capacity of slabs under a combination of loadsSuperposition tests(1)• 2nd series experimental work:• Slabs under combined loading• Line load• Preloading• 50% of shear strength slab strips• Concentrated load• loading until failure• 26 experiments• 8 specimens• Superposition hypothesis valid?
  • 7. 7Shear capacity of slabs under a combination of loadsSuperposition tests (2)
  • 8. 8Shear capacity of slabs under a combination of loadsSuperposition tests (3)
  • 9. 9Shear capacity of slabs under a combination of loadsVerification of the hypothesis,3,c combic concffcombination line conc   
  • 10. 10Shear capacity of slabs under a combination of loadsFlexible versus rigid supports (1)support of steel bearingselastomeric bearings
  • 11. 11Shear capacity of slabs under a combination of loadsFlexible versus rigid supports (2)• Flexible supports: more ductile failure mode• Distance a is same, av different
  • 12. 12Shear capacity of slabs under a combination of loadsFlexible versus rigid supports (3)av as face-to-face distance av as given by codeβ = av/2dl with av distance betweenedge of load and edge of support (orcentre of bearing where flexiblebearings are used)
  • 13. 13Shear capacity of slabs under a combination of loadsComparison to proposed method• EN 1992-1-1:2005• French load spreading method and beff ≥ 4dl• βnew = av/2,5dl for concentrated load only0.0000.5001.0001.5002.0002.5003.0000.00 0.50 1.00 1.50 2.00 2.50 3.00vRdc(MPa)τtest & β (MPa)
  • 14. 14Shear capacity of slabs under a combination of loadsConclusions• Recommendations:• effective width• β =av/2,5dl for concentrated loadson slabs• Superposition valid• Second series confirmsrecommendations• av = face-to-face distance, also forflexible supports
  • 15. 15Shear capacity of slabs under a combination of loadsContact:Eva LantsoghtE.O.L.Lantsoght@tudelft.nl+31(0)152787449