文中主要针对梁腹板带有摩擦阻尼器的自复位钢框架整体结构进行抗震性能和自复位性能的研究。首先提出利用ABAQUS有限元软件连接单元实现整体结构自复位梁柱节点双旗帜滞回模型的模拟方法。将用该方法模拟的自复位梁柱节点弯矩-转角滞回曲线与课题组已经完成的3个节点试验滞回曲线相对比,结果表明:节点刚度和弯矩值与试验值吻合较好,证明了该模拟分析方法的可行性。然后对同条件的自复位钢框架和刚接框架(仅梁柱节点形式不同)进行了24条地震动下的时程分析,结果显示:自复位钢框架各层最大绝对速度、绝对加速度和自振周期与刚接框架均十分接近,层间位移角接近或略大于刚接框架,基底剪力、结构塑性发展和震后残余层间位移角均远小于刚接框架,结构震后自动复位优势明显。
The dynamic and self-centering behaviors of steel self-centering moment resisting frames using web friction damper are researched in this paper. The simulation method about double-flag hysteresis model of beam-column connection in steel self-centering structures is put forward firstly by utilizing connecting element of ABAQUS finite element software. Comparing the self-centering beam-column moment-rotation hysteresis loops from this simulation method with results of three connection experiments completed by the research group,the moment and stiffness of the connection from the simulation results are consistent with experimental results,which verifies the feasibility of the simulation method. The seismic time-history analyses including 24 ground motion records on steel self-centering moment resisting frame and steel moment resisting frame( just difference in beam-column connection types) under the same conditions are carried out. And the results show that the maximum absolute velocity,absolute acceleration and period of vibration from each story of steel self-centering moment resisting frame are close to the results of steel moment resisting frame respectively. The story drift is close to or slightly larger than that of steel moment resisting frame,and the baseshear force,the structural plasticity development and residual story drift are far less than those of steel moment resisting frame. The self-centering advantage is greatly obvious after earthquake.