A common type of Slim-Floor-Constructions consists of prestressed hollow core slabs supported onthe lower flange of transverse shallow steel beams. This construction method enables slender ceilingswithout girders. However, the shear capacity of the hollow core slabs is considerably reduceddue to transverse stresses when the supporting beams with a limited bending stiffness deflect. At theInstitute of Structural Concrete at RWTH Aachen University, four full-scale tests on two-span floorsystems were performed to investigate the load bearing behavior of hollow core slabs on flexiblesupports. The effects of several test parameters, such as cross section of the slabs, bending stiffnessof the steel beam, bearing details, horizontal constraints of the slabs and filling of selected cores onthe shear capacity were determined. International design provisions are briefly described andrecommendations regarding the construction and the design are given.
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