预制减震墙板加固震损框架抗震性能试验研究

本文中提出先对震损框架进行局部修复，再采用预制减震墙板进行加固的预制减震墙板加固震损框架的方法，设计制作震损修复框架(RBF)、预制减震墙板加固震损框架(DWF)以及预制普通墙板加固震损框架(CWF)3榀足尺试件，对其进行拟静力加载试验，对比研究3个试件的滞回性能、承载能力、破坏形态以及延性等抗震性能。结果表明：对震损框架进行局部修复，再采用预制减震墙板对其进行抗震加固可提高震损修复框架的抗侧刚度、承载能力和屈服后的变形能力；预制减震墙板加固震损框架(DWF)滞回曲线稳定、饱满，其承载力衰减缓慢，具有良好的持续抵抗外荷载的能力，不改变震损修复框架结构的受力和破坏特征，其变形能力满足GB 50011—2010《建筑抗震设计规范》罕遇地震作用下1/50层间位移角的要求，具有良好的抗倒塌能力；预制减震墙板单元与框架间的拉结筋构造措施提高了结构的整体性，保证了预制减震墙板既定的摩擦滑移耗能机制的有效实现。

Experimental study on seismic performance of damaged frame retrofitted by precast damping wall

A new method for retrofitting damaged frames under seismic loading was proposed. This new method is to locally repair the damaged frame first and then to retrofit the repaired frame by using precast damping wall. Three full scale specimens, namely,carbon-fiber repaired frame(RBF), carbon-fiber repaired frame retrofitted by precast damping wall (DWF) and carbon-fiber repaired frame with wallboard (CWF), were designed to study their difference in hysteretic performance, load carrying capacity, failure characteristics and ductility by quasi-static experiment. The results show that, the lateral stiffness, bearing capacity and deformation capacity after yielding is improved by locally repairing the damaged frame and then using the precast damping wall to retrofit the repaired frame. The hysteretic curve of the DWF is stable and plump, and the decrease in the load bearing capacity is slow, which indicates that the DWF performs well against repeated external loading. In addition, the behavior and failure characteristics of carbon-fiber repaired frame structures would not be changed by infilling the DWF, and the deformation capacity of the DWF meets GB 50011—2010 ‘Code for seismic design of buildings’ requirement that the available inter-story drift angle should be greater than 1/50 for severe earthquakes, which suggests that the DWF has good collapse resistance. The connection between the precast damping wall unit and the frame is able to improve the integrity of the structure, mitigate the damage to the precast damping wall and ensure the realization of friction-sliding energy dissipation mechanism of the precast damping wall.