【摘要】 应用有限元软件ABAQUS建立半刚性连接的钢管混凝土平面框架模型,采用SPRING2单元模拟半刚性节点,节点采用具有半刚性特性的不同弯矩-转角曲线作为约束条件。对比了2层两跨半刚性框架试验的荷载-位移模拟曲线和试验曲线进行模型验证。基于验证结果,对一典型6层三跨半刚性连接的钢管混凝土框架进行了模拟,分析不同连接刚度条件对钢管混凝土组合框架的抗震性能影响。结果表明:半刚性连接对钢管混凝土框架结构的抗震性能影响显著。相对于刚接,采用半刚性连接时,钢管混凝土框架结构底层剪力明显减小,低阶振型的自振周期增大,结构动力响应变化很大。更多还原

【Abstract】 A semi-rigid connection model of the composite planar frame with concrete-filled steel tubular(CFST) columns is established using ABAQUS,and the semi-rigid connection is simulated with SPRING2 element in ABAQUS elements library.Different moment versus rotation relationships with semi-rigid characteristic are used to describe the behavior of the connection constraint.The model is verified by comparing the simulated load versus displacement curves with the others experimental results of a two-floor-span semi-rigid frame with CFST tubular columns.Based on the model,a six-floor-three-span plane frame is simulated and the influence to the seismic performance of the composite frame under different connection rigidity is analyzed.The results show that the rigidity of the semi-rigid connection of the frame with CFST columns significantly affects the seismic performance.Unlike the rigid conection for the composite frames with CFST columns,the bottom shear forces of the semi-rigid connections are reduced clearly,the natural periods of low-level order are increased,and the dynamic response is changed obviously.更多还原