大空间钢网架结构耐火性能分析

Research of fire resistance ability of the large-space steel truss

目前大空间钢网架被广泛应用于我国现代建筑中,然而钢材耐火性能较差,常温下钢材强度较高,高温时强度会迅速劣化,极易发生屈服现象。我国对于大空间钢网架耐火性能的研究较少,现行的规范不够完善,因此,对于大空间钢网架耐火性能的研究具有十分重要的理论意义和工程价值。以实际工程中大空间钢网架为研究对象,应用ABAQUS有限元软件进行钢网架结构的抗火性能模拟计算分析,得出了该钢网架结构在火灾下的应力、应变和位移变化规律。

At present,large-space steel truss has been widely used in modern buildings in China. However,the steel material is weak in fire resisting,steel has high strength at normal temperature,and it is yielded easily at the high temperature. The research on large-space steel truss’ s fire-resistant behavior is still inadequate,the current provisions are not perfect enough,therefore,the research on the fire resistance of large-space steel truss is a great value in theory and engineering. Taking the large space steel grid in the actual project as the research object,the ABAQUS finite element software was used to simulate and analyze the fire resistance performance of the steel grid structure. The variation of stress,strain and displacement of the steel grid structure under fire was obtained.