Documentation for Calculations of Standard Fire Resistance of Slabs and Walls of Concrete with Expanded Clay Aggregate

A number of full-scale tests are made in order to document calculation methods for fire-exposed slabs and walls derived during a previous project on fire exposed light-weight aggregate concrete constructions. The calculation methods are derived, and thus have a logical connection with the calculation methods used for other load cases.

In addition the methods are shown to be valid for heavy concrete constructions by cooperation with tests for beams and columns, and a few slabs and walls. The two test series phase 1 and 2 of this report can therefore be seen as a necessary supplement to show that the methods are applicable for slabs and walls of light weight aggregate concrete.

It is shown that the temperatures for standard fire exposed cross sections can be calculated, that the ultimate moment capacity can be calculated for slabs, and that the anchorage capacity and the shear tension capacity can be calculated for slabs and that a support of only 70 mm is sufficient for slabs with deformed bars and the actual loads.

It is also shown, that the load bearing capacity can be modeled for walls, if a detailed model for the thermal expansion is used, and if the calculation is made in time steps taking the transient strains into account.