Tensile membrane action can have a major influence on the performance of composite floor structures, and a number of design tools have been developed to take account of this. These represent a major advance on previous design methods and generally compare well with available test data. However, uncertainties remain about suitable failure criteria and the relative importance of various assumptions. This paper reports on a project to study these issues, comparing results obtained using different design methods, and also with tests on model scale slabs.
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