Abstract
ABSTRACTThis paper is concerned with the material characteristics of various commercial high strength structural steels (yield strengths between 460 and 700 N/mm2) under fire conditions. The paper proceeds with a description of the experimental programme which includes two different grades of high strength steel. The aim of this research is to assess (i) the mechanical properties at elevated temperature through tensile testing to support the safe design of fire resistant structures made from high strength steel and (ii) the effect of chemical composition and processing route on the microstructure through a detailed metallurgical investigation. In this paper, a series of isothermal and anisothermal elevated temperature tests are conducted on two commercially‐available steel grades (S690QL and S700MC). Following a detailed description of the tests, the results are analysed to determine strength and stiffness reduction factors at elevated temperatures and these values are compared with literature and EN 1993‐1‐2 (2005). It was found that the results for S700MC, for which there is limited data in the literature, showed better strength retention properties than S690QL at elevated temperatures. The results also showed that under isothermal conditions, the guidance for the elastic moduli of these materials may be unconservative and overly optimistic.
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