火灾后型钢混凝土平面框架抗震性能有限元分析

建筑火灾的频繁发生给人们的生命及财产安全带来的危害越来越大,建筑结构抗火性能研究已成为建筑结构安全分析领域的一个重要课题.针对火灾后型钢混凝土柱-型钢混凝土梁-钢筋混凝土楼板单层单跨组合平面框架的抗震性能进行了研究,运用有限元分析软件ABAQUS建立了模型,考虑受火时间、柱轴压比和梁跨中荷载等因素对其的影响,研究了火灾后型钢混凝土框架的滞回曲线和骨架曲线,并在此基础上分析了各参数对火灾后型钢混凝土框架延性和耗能方面的影响.通过分析可知在相同轴压比和相同梁跨中荷载的情况下,受火时间越短滞回曲线越丰满,亦即抗震性能越好;在相同受火时间的情况下,轴压比越小滞回曲线越丰满;而梁跨中荷载大小变化对滞回曲线影响较小.且在最不利的情况下,延性系数为3.53,等效粘滞阻尼系数为0.24,说明型钢混凝土框架结构具有的良好的延性和抗震性能.

Anti-Seismic Performance Finite Element Analysis of Steel Reinforced Concrete Frame after Fire

With the frequent occurrence of building fire, the harm to people＇s life and property is growing. Researches on fire resistance performance have become an important topic in the field of structural safety analysis. This paper focuses on the studies of the mechanical properties of the plane frame after fire which is composed by the steel reinforced concrete column, steel reinforced concrete beam and reinforced concrete floor slab. By using the software of ABAQUS, the hysteretic curves and skeleton curves of the steel reinforced concrete frame after fire are obtained. The effects of the factors such as the fire time, the column axial compression ratio and beam load are analyzed and the effects on the ductility and the dissipation of the steel reinforced concrete frame after fire are further discussed. And it is obtained that with the same axial compression ratio and beam mid-span load, the shorter the fire time is, the more plump the curve is. And under the same fire time the smaller the axial compression ratio is, the more plump the curve is. What is more, the size of beam mid-span load has smaller influence on hysteresis curve. Under the worst condition if the ductility factor is 3.53 and equivalent viscous damping coefficient is 0.24, the steel reinforced concrete frame structure has good ductility and anti-seismic performance.