足尺钢桁架连梁抗震性能试验研究及非线性有限元分析

对4 个足尺的新型钢桁架连梁试件进行了低周反复荷载试验,研究了试件的破坏形态,测量分析了连梁加载点的荷载位移滞回曲线,并分析了连梁的延性、刚度退化规律和耗能能力。采用通用软件ABAQUS 对钢桁架连梁进行了单调加载及低周反复加载作用下的非线性有限元分析。有限元计算和试验结果对比分析表明:两者的荷载位移曲线及承载力特征点吻合较好,都证明钢桁架连梁具有较好的延性,能够耗散较大的地震能量。在此基础上对钢桁架连梁进行了参数分析,研究了腹杆截面、弦杆截面和跨高比对连梁受力性能的影响,以供进一步研究和工程设计参考。

EXPERIMENTAL STUDY AND NONLINEAR FINITE ELEMENT ANALYSIS ON THE SEISMIC PERFORMANCE OF FULL-SCALE STEEL TRUSS COUPLING BEAMS

Based on a low-cyclic loading experimental study on 4 full-scale specimens of a new type of steel truss coupling beam,the failure patterns and the load-displacement hysteretic curves of the beams’ loading point were studied,and the beams’ ductility,rigidity degradation discipline and energy dissipation mechanism were analyzed as well.Nonlinear finite element analyses were conducted on these beams under monotonic loading and low cyclic loading using ABAQUS.The result of finite element calculation and test shows that the load-displacement curves and bearing capacities’ characteristic points of both methods are in a good agreement,which all prove that the steel truss coupling beam has good ductility and good ability of dissipating earthquake energy.Parametric analyses were carried on to investigate the influences of the sections of web members and chord members,and the span-to-depth ratio on the beams’ mechanical property,which can be available for reference of further research and aseismic design of the steel truss coupling beam system.