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以采用端板预拉对穿螺栓的两层单跨新型卷边钢板组合截面PEC(弱轴)-钢梁(梁端削弱截面)组合框架结构试验试件为研究对象,利用有限元软件ABAQUS对其进行低周往复荷载下滞回性能有限元分析。研究结果表明:试件结构具有较高承载力和较大的抗侧刚度,两层初始抗侧刚度差距较大,随着加载引起结构损伤进程的发展,刚度差异不断减小;试件主要通过梁端屈服和PEC柱脚混凝土压溃与钢构架屈服耗能,上下层耗能分布均匀;采用端板预拉对穿螺栓连接和梁端削弱截面,不仅使连接具有部分自复位功效,且较好改善了连接的转动能力和抗震耗能需求;试件最终破坏模式为梁端和PEC柱脚处形成塑性铰的塑性破坏机构,层间侧移和连接转角均超过大震层间侧移限值(1/30),表明试件结构体系具有良好的抗震性能。
Taking PEC (weak axis) - steel beam (beam end weakening section) composite frame structure test specimen with two layers of single span as an example, It performs finite element analysis of hysteretic behavior under low cyclic loading. The results show that the specimen structure has higher bearing capacity and greater lateral rigidity, and the difference of initial lateral stiffness between the two layers is larger. The stiffness difference decreases with the development of structural damage caused by loading. The specimen mainly passes through Bending of concrete at end of beam and collapse of concrete in PEC column and yielding energy of steel frame and uniform energy dissipation in upper and lower layers. So the connection rotation ability and seismic energy dissipation requirement are improved. The ultimate failure mode of the specimen is the plastic failure mechanism which forms the plastic hinge at the beam end and the PEC column foot. The lateral displacement and the connection angle of the specimens exceed the lateral displacement between the large earthquakes Value (1/30), indicating that the specimen structural system has good seismic performance.