高温下钢框架敏感构件评估方法

Evaluation Method for Sensitive Components of Steel Frame at High Temperature

敏感性较大的构件受火时易使结构发生连续倒塌,引起结构安全性的降低,应提前加强保护。为了确定钢框架结构受火时可能引起结构连续倒塌的敏感构件,本文提出了一种高温下钢框架结构敏感构件的计算方法。使用ANSYS有限元软件进行数值模拟,提取构件在不同温度荷载作用下的应力值,计算得到高温作用下构件的敏感性系数,最终确定结构中最敏感的构件。

When exposed to fire,the components with high sensitivity are easy to initiate continuous collapse of structure,resulting in reduction of the structural safety.Therefore,the protection should be strengthened in advance.In order to determine the sensitive components of the steel frame structure that may cause the continuous collapse when fire occurs,this paper proposes a calculation method to determine the sensitive component of steel frame structure under high temperature.The finite element software,ANSYS,is used for numerical simulation to extract the stress values of components under loadings of different temperatures,and to obtain the sensitivity coefficient of components at high temperature.Finally,the most sensitive components in the structure can be identified.