火损GHPFRCC框架结构抗震性能有限元分析

基于火损C30和GHPFRCC框架的低周反复试验,利用OpenSees软件,选取3种不同的钢筋本构模型,进行非线性模拟分析.对比滞回曲线、骨架曲线、荷载、位移和延性系数等,有限元模拟结果与试验结果吻合较好.通过数值模拟,分析了轴压比和不同受火工况对火损GHPFRCC框架抗震性能的影响.结果表明:钢筋选用Hysteretic本构模型,模拟结果较好;随着轴压比的增大,GHPFRCC框架结构的极限承载力和位移逐渐降低,对结构的延性越不利;相比于下层受火框架,上层受火框架的极限位移和延性较大,双层受火框架的极限承载力和位移有所降低.

Simulation and Analysis on Seismic Performance of Fire Damaged GHPFRCC Frame Based on OpenSees

Based on the low-cycle load test of fired C30 and GHPFRCC frame,three different steel constitutive models were selected to carry out finite element numerical simulation on the OpenSees platform.For the hysteresis curves,skeleton curves,load,displacement and ductility coefficients,the finite element simulation results are in good agreement with the experimental results.The effects of axial compression ratio and different fire conditions on seismic performance of the GHPFRCC frame was analyzed using finite element simulation.The results show that the hysteretic constitutive model has a good performance.With increase of the axial compression ratio,the ultimate bearing capacity and displacement of the GHPFRCC frame structure gradually decreased,which is more unfavorable to ductility of the structure.Compared with the lower story fired frame,the upper story fired frame has higher ultimate displacement and ductility.However,the ultimate bearing capacity and displacement of the double story fired frame decreased.