钢框架后张抗震梁柱节点的非线性分析

Nonlinear analysis of seismic resistance capacity of posttensioned column-beam connections for steel frames

推导了后张顶底角钢梁柱节点的初始刚度及极限承载力的一般公式,并利用ANSYS建立了其三维有限元模型,模拟该节点在地震荷载下的受力特征。分析表明,后张顶底梁柱节点具有与传统焊接刚性节点相近的刚度,能够充分发挥各个组成构件的性能,且残余变形较小。对比证明,角钢厚度和后张力大小是影响节点性能的主要因素。最后针对后张节点的薄弱环节提出了适合应用的改进形式。

The general formula of initial stiffness and ultimate load for posttensioned column-beam connections of top and bottom angle are derived.A three-dimension finite element model for the column-beam connection is set up by the ANSYS,the dynamic behavior of the connections under earthquake loads is simlated.The results analyzed are indicated that the stiffness of the posttensioned column-beam connections is similar to that of the welded connections,performances of its components can be brought full play,and residual displacement is small.The angle thickness and the posttensioned force are major factors,which are influenced on the performance of the connections.Finally,a suitable improved form that is pointed to the connection＇s weak parts is put forward.