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为进一步研究新型卷边部分外包组合柱(PEC柱)-钢梁组合框架层间抗震机理,以新型卷边PEC柱-钢梁端板预拉对穿螺栓连接组合框架中间层子结构试验试件作为研究对象,利用有限元软件ABAQUS对其进行水平低周往复荷载下抗震性能的有限元分析。基于计算数据整理,分析试件结构的承载力与抗侧刚度、节点连接性能、耗能能力、剪力分配、变形模式、节点域传力机理和破坏模式等抗震性能。研究结果表明:试件结构具有较高的承载力和初始抗侧刚度;新型卷边PEC柱平均分担试件层间水平剪力;预拉对穿螺栓具有部分自复位功效;梁端连接具有较大的转动刚度,相应限制了其转动能力的发挥;试件最终破坏模式为所有梁端端板附近截面形成塑性铰的塑性机构,而相应层间剪切角和节点连接转角均超过设防烈度地震层间侧移限值1/50,表明该结构体系具有良好的抗震倒塌性能。
In order to further study the anti-seismic mechanism between the new hem-clad partially-exposed composite column (PEC column)-steel beam composite frame, a new type of rolled-edge PEC column-steel beam end-plate pre-pull-through bolted composite frame middle layer substructure test specimens As a research object, finite element software ABAQUS was used to perform finite element analysis of seismic performance under horizontal low-cycle reciprocating load. Based on the calculation data, analyze the seismic performance of the specimen’s structure, such as bearing capacity and side stiffness, joint connection performance, energy dissipation capacity, shear distribution, deformation mode, force transmission mechanism and failure mode of the node domain. The results show that the specimen structure has high bearing capacity and initial anti-side stiffness; the new curled PEC column equally shares the horizontal shear force between the specimens; the pre-pulled and penetrated bolts have partial self-resetting effect; and the beam end connections have a comparative advantage. The large rotational stiffness limits the use of its rotation capability; the ultimate failure mode of the specimen is a plastic mechanism that forms a plastic hinge near the cross section of all beam end plates, and the corresponding interlayer shear angle and joint connection angle exceed the fortification intensity between seismic layers. The lateral shift limit of 1/50 indicates that the structural system has good seismic collapse performance.