火灾爆炸作用下型钢柱的动力响应与破坏模式分析

基于ANSYS/LS-DYNA有限元软件,利用流固耦合的方法,对单层单跨的型钢框架进行火灾爆炸作用下型钢柱的动力响应及破坏模式的模拟分析。结果表明,在火灾爆炸作用下,当温度低于200℃时型钢柱产生不可恢复的塑性变形,“比例距离”对型钢柱的动力响应最为显著;在型钢柱两端固接时,易发生剪切破坏,在截面惯性半径接近时,其破坏模式与截面形状无关。

Based on the finite element software ANSYS/LS-DYNA,the dynamic response and failure mode of steel columns of single-story and single-span steel frame under fire and explosion are simulated and analyzed by using fluid-solid coupling method.The results show that under the action of fire and explosion,the irrecoverable plastic deformation of the section steel column occurs when the temperature is lower than 200℃,and the dynamic response of the"proportional distance"to the section steel column is the most significant,and shear failure is prone to occur when the two ends of the section steel column are fixed.The failure mode is independent of the shape of the section when the inertial radius of the section is close.