【摘要】 为研究火灾引起多高层钢结构连续性倒塌的破坏机理以及多高层钢结构在火灾作用下的初始破坏规律,基于ABAQUS预定义场和重启动功能,建立了局部火灾引起多高层钢结构连续倒塌分析的静-动力转换分析方法,运用此分析方法模拟了局部火灾作用下钢结构的破坏过程,重点研究了柱破坏引起多高层钢结构倒塌的初始破坏机理,分析了受火柱约束刚度比和荷载水平对火灾作用下钢结构初始破坏以及对整体结构产生动力效应的影响规律。研究结果表明:静-动力转换分析方法具有可行性;初始破坏的动力放大系数在1.2~1.5之间。更多还原

【Abstract】 To investigate the progressive collapse mechanism and the initial failure rule of multistory steel structures under fire conditions,the static-dynamic conversion analysis method was developed based on the predefined field and restart function of ABAQUS.Applying this staticdynamic analysis method,the failure process of a steel structure under local fire was simulated and the initial damage mechanism of multi-story steel structures caused by the damage of column was studied.The influence of restraint stiffness ratio and load level to the initial damage mechanism of steel structures under fire conditions and dynamic effect of the whole structures was analyzed.The study results show that the static-dynamic conversion analysis method is feasible and the dynamic amplification coefficient of the column initial damage lies from 1.2to 1.5.更多还原