Abstract
After a fire event, the exposure to extreme temperature variations could have reduced the load-bearing capacities of steel members. The main reason for this is the reduction in postfire mechanical properties (yield strength, elastic modulus, ultimate strength, and elongation) of steels. After a fire attack, some steel buildings may collapse and some may not have serious damage. On cooling from elevated temperatures, the structural engineer then must decide if the residual strength of the load carrying members was still adequate for future use. In this chapter, tension test and results on residual strength and elastic modulus of steels after fire exposure are presented. The residual factors are determined by test results, and design equations are proposed for predicting the residual strength of high strength steels after fire exposure.
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