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Information gained from standard load and fire tests on eleven steel-supported constructions is presented. An elastic analysis of an idealized composite steel-concrete beam is developed, and a definition for the degree of composite action inherent in test specimens is proposed. The restraint afforded by the test frame and its importance to continued composite action during the fire test are examined. The degree of composite action is calculated for a number of assemblies, and the mechanism of load failure during fire test is discussed briefly. Using this information, some aspects of present fire test practice are examined and possible improvements are suggested.
fire tests, steel construction, reinforced concrete, failure, thermal expansion, restraint
Pearce, N. S.
Assistant chief engineer, Underwriters' Laboratories of Canada, Scarborough, Ont.
Stanzak, W. W.
Steel industries fellow, National Research Council, Ottawa, Ont.