火災加熱を受けた高強度鋼材の材料特性の評価に関する一提案

抄録

This study is aimed at evaluating the residual properties of high strength structure steel (HSSS) after a fire. Tensile coupons obtained from the HSSS Q690 sheets were heated to various temperatures up to 900 °C, and then were cooled down in furnace to ambient temperature. Tensile coupon tests were carried out to obtain their post-fire mechanical properties and ductile fracture behaviors. Test results showed that the HSSS can keep the unchanged mechanical properties after it experiences temperatures up to 600 °C. As a result, prediction equations are obtained to evaluate the post-fire properties of HSSS.