高强度耐火钢高温冷却后力学性能试验研究  

EXPERIMENTAL STUDY ON POST-FIRE MECHANICAL PROPERTIES OF HIGH STRENGTH FIRE-RESISTANT STEEL

作　　者：楼国彪[1,2] 费楚妮 王彦博[1] 陈林恒 LOU Guo-biao;FEI Chu-ni;WANG Yan-bo;CHEN Lin-heng(College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Nanjing Iron&Steel Co.,LTD.,Nanjing 210035,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092 [3]南京钢铁股份有限公司,南京210035

出　　处：《工程力学》2022年第9期153-159,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(5201001048);应急管理部消防救援局重点攻关项目(2019XFGG10)。

摘　　要：该文对国产Q460FR、Q420FR、Q345FR等高强度耐火钢进行了200℃~800℃高温过火、自然冷却后的拉伸试验,在获得高强度耐火钢高温冷却后的应力-应变关系曲线和力学性能参数,并与普通结构钢的高温冷却后力学参数进行对比后,给出了屈服强度和抗拉强度变化系数拟合公式。研究表明:国产高强度耐火钢在高温冷却后的屈服强度和抗拉强度均得到提高,弹性模量基本稳定。该文研究的结果可以用来评估耐火钢结构火灾后的承载性能。A series of static tensile tests on high-strength fire-resistant steel such as grades Q460FR,Q420FR,Q345FR after fire were carried out in this study.The stress-strain curves and mechanical parameters of highstrength fire-resistant steel with post-fire temperatures from 200℃ to 800℃ were obtained.After comparing their mechanical properties with those of ordinary structural steels after high-temperature cooling,the coefficient of variation fitting equationthe of yield strength and tensile strength were proposed.It is shown that:the yield strength and tensile strength of high-strength fire-resistant steel with natural cooling after fire have been improved,while the modulus of elasticity is not influenced by exposing to fire.The results of this study can be applied to the assessment of load-bearing performance of fire-resistant steel structures after fire.

关 键 词：耐火钢 过火温度 高温后 拉伸试验 力学性能 

分 类 号：TU541[建筑科学—建筑技术科学]