Concrete slabs under a combination of loads

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Concrete slabs under a combination of loads

  1. 1. CONCRETE SLABS UNDER ACOMBINATION OF LOADS INSHEAREva Lantsoght, Cor van der Veen, Joost WalravenEva O.L. Lantsoght, Cor van der VeenJoost C. WalravenDelft University of Technology
  2. 2. 2Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyHYPOTHESIS OF SUPERPOSITION• Concentrated load over effective width• Distributed loads over full width• Sum of stresses with combination of loads ≥ stresswith concentrated load only
  3. 3. 3Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologySUPERPOSITION 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?
  4. 4. 4Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologySUPERPOSITION TESTS (2)
  5. 5. 5Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologySUPERPOSITION TESTS (3)
  6. 6. 6Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyVERIFICATION OF THE HYPOTHESIScombination line conc   ,3,c combic concff
  7. 7. 7Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyFLEXIBLE VERSUS RIGID SUPPORTS(1)support of steel bearingselastomeric bearings
  8. 8. 8Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyFLEXIBLE VERSUS RIGID SUPPORTS(2)• Flexible supports: more ductile failure mode• Distance a is same, av different
  9. 9. 9Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyFLEXIBLE 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(or centre of bearing where flexiblebearings are used)
  10. 10. 10Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyCONCLUSIONS• Superposition valid• av = face-to-face distance,also for flexible supports
  11. 11. 11Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyContact:Eva LantsoghtE.O.L.Lantsoght@tudelft.nl+31(0)15278744914/06/2013 – 12h: PhD Defence at Aula TU Delft

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