Processing and cooling effects on post-fire mechanical properties of high strength structural steels

Experimental and numerical investigation of S700 high strength steel CHS beam–columns after exposure to fire

“…The thermal properties of high strength steels at elevated temperatures, including the thermal expansion, specific heat and thermal conductivity, were experimentally studied by Xing et al [6], with new predictive formulae proposed. The postfire residual material properties of high strength steels with yield stresses ranging from 460 MPa to 1200 MPa have been studied in a series of testing programmes [7][8][9][10][11][12][13][14][15][16][17]. The test results revealed that the extent of reduction in material properties of high strength steels after exposure to fire is different to that of normal strength steels, and new formulae were developed for predicting the post-fire residual material properties of high strength steels.…”

“…The test results revealed that the extent of reduction in material properties of high strength steels after exposure to fire is different to that of normal strength steels, and new formulae were developed for predicting the post-fire residual material properties of high strength steels. Moreover, the influence of cooling methods, including cooling in air, water, fire-fighting foam and liquid nitrogen, on the post-fire residual material properties of high strength steels [12,[14][15][16] were investigated and quantified. Su et al [13] measured the membrane residual stresses in S690 high strength steel welded I-sections after exposure to elevated temperatures ranging from 30 °C to 950 °C, studied their distributions and magnitudes, and proposed predictive models.…”