螺栓连接装配式一字形钢筋混凝土剪力墙承载力分析

针对螺栓连接装配式剪力墙的受力特性,推导了该装配式剪力墙水平接缝的滑移承载力、连接钢框屈服荷载的计算式,分析了钢框的局部屈曲.基于现有研究成果及规范方法,对预制墙板的开裂、屈服、峰值荷载以及斜截面受剪承载力进行了计算.建立了墙体水平接缝受剪承载力计算模型,给出了受剪承载力的计算式.研究结果表明:该装配式剪力墙的特征荷载与承载力的计算值与试验值吻合较好;合理的设计可实现试件屈服前或达到峰值荷载前受拉端连接件不滑移,以及在试验全过程中连接钢框受拉端不屈服;改善连接钢框翼板与腹板之间的焊接质量能大幅度提高连接钢框的屈曲临界荷载,避免局部屈曲的发生.高强度螺栓的滑移承载力,以及剪力墙受压区预制墙板底部与连接钢框腹板之间的摩擦作用是构成墙体水平接缝受剪承载力的两个主要部分.

Analysis on load bearing capacities of rectangular precast reinforced concrete shear wall assembled by high strength bolts

In view of the mechanical characteristics of precast reinforced concrete (RC) shear wall assembled by high strength bolts, the formulae of the anti-sliding capacity of horizontal connection and yield load of connecting steel frame (CSF) were deduced. The local buckling of CSF was analyzed. Based on the results of existing research and the mythology of current design codes, the cracking load, yield load, peak load and shear capacity of the precast walls were calculated. Based on the established calculation model for the horizontal connections, the formula of shear capacity was proposed subsequently. The research results show that the calculated characteristic loads as well as the load bearing capacities are in good agreement with the test results of the proposed assembled shear wall. Relative slippages at the tension end of the connection can be prevented before yield load or peak load. The CSF does not yield at the tension end throughout the test. The critical buckling stress can be significantly increased by improving the quality of the welding between the CSF flange and web. Therefore, the local buckling can be avoided. The shear capacity of horizontal connections is mainly attributed to the slip resistance of high strength bolt connections and the friction between the wall bottom and the CSF web at the compression side.