钢管混凝土L形柱-H型钢梁Z字形节点抗震性能研究

SEISMIC BEHAVIOR OF Z-SHAPED JOINT CONNECTING H-BEAM AND L-SHAPED CONCRETE-FILLED STEEL TUBULAR COLUMN

对适用于装配式钢结构的钢管混凝土L形柱-H型钢梁Z字形节点的抗震性能进行研究。建立并基于节点试验结果验证了ABAQUS有限元模型,通过有限元分析获得了节点的荷载-位移曲线、骨架曲线、破坏模式和性能指标。结果表明:设置腹板拼接板、增加梁高、减小上翼缘最外排螺栓与拼接区中心距离等措施,能够提高节点的屈服荷载和峰值荷载;增加翼缘高强度螺栓数量能够提高节点的滑移荷载,但是会降低延性;增加悬臂梁外伸距离,可以提高滑移荷载、屈服荷载和峰值荷载,减少翼缘连接的高强度螺栓数量需求。基于有限元结果,验证了节点受弯承载力和极限受弯承载力计算公式的可靠性。

The seismic behavior of Z-shaped joints connecting H-section beam and L-shaped concrete-filled steel tubular column for prefabricated steel structures were studied.The ABAQUS finite element model was established and validated based on the joint test results.The load-displacement curves,skeleton curves,failure mode and performance indicators of the joint were obtained by finite element analysis.According to the finite element results,adding web splice plates,increasing the beam section height or decreasing the distances between the outmost bolts and the splicing zone center can increase the yield load and peak load of the joints.Increasing the bolt number on the flange can improve the slip load of the joint,but may reduce the ductility performance.Increasing the overhang distance of cantilever beam can improve the slip load,yield load and peak load,and reduce the required bolt number for the flange connection.Based on the finite element results,the reliability of the calculation formulas for the joint flexural capacity and ultimate flexural capacity is verified.