隔板贯通式方钢管混凝土柱-钢蜂窝梁节点抗震性能

Seismic Behavior of Diaphragm-through Type Square Concrete Filled Steel Tubular Column-Steel Castellated Beam Joint

目的 研究隔板贯通式方钢管混凝土柱-钢蜂窝梁(DTSCFSTC-SCB)节点的抗震性能,为工程应用提供设计依据。方法 应用有限元分析软件ABAQUS对比DTSCFSTC-SCB节点与隔板贯通式方钢管混凝土柱-钢梁(DTSCFSTC-SB)节点的抗震性能,分析不同参数对其抗震性能的影响。结果 DTSCFSTC-SCB节点的承载力较DTSCFSTC-SB节点的承载力降低10%,延性系数提高6.8%;钢材强度、梁柱线刚度比对其抗震性能影响较大(25%~138%);隔板内(外)伸宽度仅在一定范围内对其延性影响较明显(13%~18%),隔板厚度仅在一定范围内对其承载力影响较明显(7%~8%),开孔率对其最大承载力、耗能能力影响较明显(4%~12%);轴压比、混凝土强度等级、含钢率、孔间距、孔壁距离对其抗震性能影响很小(1%~5%)。结论 该节点具有工程可行性,钢材强度、梁柱线刚度比是影响其抗震性能的主要因素。

To study the seismic behavior of the diaphragm-through type square concrete-filled steel tube column-steel castellated beam(DTSCFSTC-SCB)joint and provide design basis for engineering applications,FEM was applied to compare the seismic behavior of DTSCFSTC-SCB with the diaphragm-through type square concrete filled steel tubular column-steel beam(DTSCFSTC-SB)joint.Its seismic behavior influencing factors were analyzed.The results show that the bearing capacity of DTSCFSTC-SCB joint is 10%lower and the ductility coefficient is 6.8%higher than that of DTSCFSTC-SB joint.The steel strength and beam-column′s linear stiffness ratio has a greater influence(25%~138%)on its seismic behavior.The inner and extension widths of the diaphragm has a significant influence(13%~18%)on its ductility within a certain range.The thickness of the diaphragm has an obvious influence(7%~8%)on its bearing capacity.The opening rate has an obvious influence(4%~12%)on its bearing capacity and energy dissipation capacity.The axial compression ratio,concrete grade,steel ratio,hole pitch and hole wall distance has less influence(1%~5%)on its seismic behavior.DTSCFSTC-SCB joint is practical in engineering,and the steel strength,beam-column′s linear stiffness ratio and opening rate are the main factors affecting its seismic behavior.