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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;截面初始预压应力的增加将降低结构的延性,但也减小了试件最终的残余变形;增加普通耗能钢筋的面积,可以提高结构的耗能能力,但增加了最终残余变形。通过分析,提出普通耗能钢筋的配筋率和初始无连接长度、预应力筋的初始有效预应力的合理取值,为设计不对称混合连接框架提供了参考。
The asymmetric hybrid connection belongs to the post-tension damped dry-jointed ductile joints, and the finite element analysis program DRAIN_2DX is used to study the seismic behavior of the beam-column joints under low cyclic reversed loading. The results of finite element analysis show that the hysteresis curve is obviously asymmetric, the hysteresis curve is more full and the energy consumption is better under the positive loading, and the area covered by the hysteresis curve under the reverse loading is smaller with less energy dissipation ; The hysteresis curve is generally inverse S-shaped and gradually changes to the bow shape with the increase of displacement; the increase of the initial pre-stress of cross-section will reduce the ductility of the structure, but also reduce the final residual deformation of the specimen; increase the ordinary energy- Of the area, can increase the energy consumption of the structure, but increased the final residual deformation. Through the analysis, the reasonable value of the initial effective prestressing of the prestressing tendons and the reinforcement ratio and the initial non-connecting length of ordinary energy-consuming reinforcing bars are proposed, which provides a reference for designing the asymmetrical hybrid connecting frame.