遭受火灾的大跨网架结构性能评估方法研究

摘要

A finiteelement model analyzing the post fire mechanical performance of space grid structures with the temperature increase-decrease course was proposed combined with the usage of numerical simulation of post fire mechanical performance of space grid structures provided by ABAQUS.The deformation and load carrying capacity of the typical space grid structures was calculated by using this method.The changes of space grid structures load and deflection as well as the time of the membrane effect were analyzed.The results showed that the load bearing capacity reduced 20％ after fire due to the temperature increase-decrease.%建立考虑升、降温的火灾后网架力学性能分析的计算模型,利用ABAQUS提供的顺序热力耦合方法实现火灾下及火灾后网架结构力学性能的数值模拟,对典型网架火灾后的变形和承载能力进行分析.分析网架结构荷载与挠度的变化以及膜效应发生的时间.结果表明,由于火灾升、降温的影响,火灾后网架结构承载能力下降20％.