Concrete slabs under a combination of loads
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Concrete slabs under a combination of loads

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    Concrete slabs under a combination of loads Concrete slabs under a combination of loads Presentation Transcript

    • 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
    • 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
    • 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?
    • 4Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologySUPERPOSITION TESTS (2)
    • 5Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologySUPERPOSITION TESTS (3)
    • 6Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyVERIFICATION OF THE HYPOTHESIScombination line conc   ,3,c combic concff
    • 7Concrete Slabs under a Combination of Loads in ShearEva Lantsoght, Delft University of TechnologyDelftUniversity ofTechnologyFLEXIBLE VERSUS RIGID SUPPORTS(1)support of steel bearingselastomeric bearings
    • 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
    • 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)
    • 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
    • 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