后张无粘结预应力混合装配式短肢剪力墙静力弹塑性分析

Pushover Analysis of Unbonded Post-tensioned Hybrid Short-pier Walls

研究了预应力度、连梁特性及墙肢特性等设计参数对后张无粘结预应力混合装配式短肢剪力墙抗侧性能的影响,并提出了设计建议。利用非线性有限元软件DRAIN-2DX中的纤维单元、梁柱单元、连接单元及自编的05单元,建立了后张无粘结预应力混合装配式短肢剪力墙的非线性有限元模型。使用静力弹塑性分析及能力谱法对新型剪力墙进行了多参数分析。新型剪力墙中因采用了后张有阻尼干性连接,具有了自恢复能力,即最终的残余变形很小。墙肢翼缘宽度、肢长、预应力筋面积的增加可大幅提高新型剪力墙的抗侧能力。研究表明,通过合理的参数选择,可使后张无粘结预应力混合装配式短肢剪力墙获得良好的抗侧能力。

In this paper, the effect of structural design parameters such as the amount of posttensioning, beam properties, and wall properties on the behavior of muhistory unbonded post-tensioned hybrid short-pier walls under lateral loads and presents the design recommends is studied. The nonlinear finite element model is established by using fiber element, beam-column element, simple connection element of DRAIN-2DX and 05 element developed by author. The parametric study is conducted by using pushover analysis and capacity diagram method. The new type of hybrid wall is possessed of the ability of self recovery by using the concept of post-tensioned with damping in ＂Dry＂ connections, i.e., the residual deformation is little. With the increase of flange width and length of piers and area of tendons, the new type of hybrid wall performs better under lateral load. The results indicate that by reasonably choosing theses parameters in design, the wall can be made with good performances under lateral load.