不对称混合连接的抗震性能模拟及关键参数研究

不对称混合连接属于后张有阻尼干连接延性节点,采用有限元分析程序DRAIN_2DX研究梁柱节点在低周反复荷载下的抗震性能.有限元分析结果表明:滞回曲线明显呈不对称形状,正向加载时的滞回曲线较为饱满,耗能较好,反向加载时的滞回曲线所包围的面积较小,耗能较差;滞回曲线大体呈反S形,随着位移的增加逐渐向弓形过渡;截面初始预压应...

STUDY ON SEISMIC BEHAVIOR MODELING AND KEY PARAMETERS OF THE UNSYMMETRICAL HYBRID CONNECTIONS

Unsymmetrical hybrid connection is a post-tensioned dry connection with damping.The finite-element analysis program DRAIN_2DX was used to simulate the seismic-resistance performance under reverse cyclic loading.Results of the finite-element analysis showed that the hysteretic curves were unsymmetrical,plumper with better energy-dissipation under positive loading,while thinner with worse energy-dissipation under negative loading,and that the hysteretic curves showed the"s"shape which gradually became bow shape,and that the increase of initial compressed stress would lead to the reduction of ductility and residual deformation,and that the increase of the area of the mild steel bars could improve the energy-dissipation ability,however increased the residual deformation.The area ratio and the initial unbonded length of mild steel bars,and the effective stress of PT tendons were studied,some useful design advice was brought forward.