PEC柱型钢梁顶底角钢连接框架抗震性能研究

RESEARCH ON THE SEISMIC BEHAVIOR OF PEC COLUMN AND STEEL BEAM FRAME CONNECTED WITH TOP- SEAT ANGLE

为了深入研究PEC柱型钢梁顶底角钢连接框架的抗震性能,以角钢螺栓边距和轴压比为变量,首先通过低周反复荷载拟静力试验分析影响框架的抗震性能指标,研究发现:增大轴压比能显著提高框架承载力,减小角钢螺栓边距可以明显改善框架初始刚度和减缓框架屈服后刚度退化;然后借助ABAQUS软件模拟分析试验试件的承载能力和破坏形态,结果表明:骨架曲线的发展趋势及破坏形态与试验所得结果吻合较好,从而验证了试验分析的可靠性;最后得出此类框架抗震性能好的结论。

In order to study the seismic performance of PEC column-steel beam frames connected with top-seat angle,the edge distance of bolts and the axial compression ratio of angle were regarded as key parameters. Above all,low cyclic loading tests were conducted to analyze the factors which could influence the seismic behavior of frames. The results showed that increasing the axial compression ratio had more influence on the bearing capacity,and shortening the edge distance of the angle bolts could significantly improve the initial stiffness of the framework even mitigate the rigidity degeneration after yield. Through the finite element software ABAQUS,the bearing capacity and failure modes of specimens were simulated and verified. The results showed that the development trends of skeleton curves and failure modes were in good agreement with the experimental results,which proved the reliability of the test analysis. The conclusion was finally drawn that the framework had good seismic performances.