【摘要】 1990年英国broadgate火灾之后,结构整体性以及由于温度而在整体结构中产生的附加应力得到了人们的重视。处于整体结构中的梁的破坏形态与单个构件的梁的破坏形态有较大差别,当考虑梁的悬链线效应时其抗火承载力明显提高。文章采用大型通用有限元程序ANSYS,对T.C.HLiu所做试验进行了验证,表明了有限元计算悬链线效应的可靠性,同时通过计算分析,提出了处于整体结构中钢梁在火灾中破坏的5个阶段,并给出了钢结构防火的概念设计建议。更多还原

【Abstract】 Effects of restrains of neighbor structures and the effects of the thermal expansion are dominant in producing deflections and forces on the steel beam which differ from that of a single steel beam. The fire resistant capacity is enhanced a lot when considering the catenary action of the steel beam. The validation to test of T. C. H Liu is presented and the 5 phase collapse procedure of the steel beam in fire is proposed in this paper with FEM software package ANSYS analysis.更多还原