预制自保温钢筋混凝土墙板加固震损框架试验研究

为了达到震后快速加固修复和建筑节能改造等综合加固改造目的，提出采用三明治式预制自保温钢筋混凝土墙板（PISW）对震损钢筋混凝土框架进行快速加固的方法。开展了4榀采用预制自保温钢筋混凝土墙板加固震损框架模型的低周往复加载试验，研究了预制自保温钢筋混凝土墙板与损伤框架之间的连接构造以及墙板配筋率对加固效果的影响，分析了试件的破坏特征、滞回性能、骨架曲线、耗能能力等。结果表明：采用预制自保温钢筋混凝土墙板加固方法可大幅度提高震损框架的承载能力；预制自保温钢筋混凝土墙板与损伤框架之间的界面强度是影响加固试件承载能力的主要因素；由于墙板破坏不充分，墙板配筋率的变化并未对承载力产生明显影响。基于试验研究结果提出了预制自保温钢筋混凝土墙板加固震损框架受剪承载力计算方法。

Experimental study on earthquake damaged frames retrofitted with prefabricated insulation sandwich walls

A technology for retrofitting damaged reinforced concrete frames with prefabricated heat-insulation sandwich wall panels (PISW) is proposed to meet the urgent need of rapid retrofitting of damaged structures after earthquake. The PISW takes on the form similar to that of a sandwich. Four damaged RC frame models retrofitted by PISW were tested under cyclic loading to investigate the influence of the connection details between PISW and the damaged frame, reinforcement ratio of PISWs on the seismic behavior of retrofitted specimens. The failure modes, hysteretic loops, skeleton curves and energy dissipation were analyzed. The experimental results indicate that: the strength of retrofitted frames specimens using PISW are remarkably enhanced; the shear strength of retrofitted frames, interface bonding strength between PISW and the damaged frame are the main parameters which affected the strength of the specimens; because the damage of the PISWs is not significant, although reinforcement ratio of RC panels increases, the bearing capacity of specimens does not improve. Based on the test results, the design method of shear capacity is provided.