反复荷载作用下PRC结构竖缝强度及刚度的退化

Research on the strength and stiffness degeneration of vertical connection in PRC structures

为了了解PRC结构竖缝的抗震性能,并进行合理的设计,以试验结果及理论分析为基础,对竖缝在反复荷载作用下强度和刚度的退化进行分析,认为接缝混凝土强度的退化率随接缝宽度的增大而减小;接合筋强度退化率仅与剪切摩擦系数有关;接缝强度的退化率随接缝宽度增大而减小,与接合筋的关系呈非线性;接缝刚度退化率随缝宽增大而减小,与接合筋关系不大。

In order to master the mechanical behaviors of vertical connection and correct design in prefabricated reinforced concrete (PRC) structures the strength degeneration and stiffness degeneration of the connection under repeated loading are analysed based on test results and theoretical analysis. It concludes that degeneration rate (DR) of concrete strength in connection decreases with connection width, but the DR of connecting rod strength involves only shear-friction coefficient, the DR of connection strength decreases with connection width and changes with connecting rod nonlinearly,and the DR of connection stiffness decreases with connection width, but has not much with connecting rod.