LOAD TRANSFER FROM HOLLOWCORE SLABS TO DELTABEAM^® SLIM FLOOR BEAMS IN CASE OF A FIRE

This paper presents the background, results and conclusions of a series of fire tests with DELTABEAM^® composite beams supporting prestressed hollowcore slabs (HCS) concerning the shifted direct support in fire situation. When designing a slab system consisting of DELTABEAM^® and HCS in fire situation, the current European design codes and product approvals for both products do not cover the special issues “indirect / shifted direct” and “flexible” support that arise from combining beams and HCS. A test program of single HCS unit shear tests and system fire tests has been carried out to assess these issues. The presented paper will give an overview of the test program and a detailed look at the shifted direct support situation for load transfer from the slab to the beam.