【摘要】 对一榀二跨二层预应力装配式混凝土框架进行了拟动力和拟静力试验,采用不同加速度峰值的El Centro地震波激励加载,并以拟动力试验的屈服位移为加载起点施加低周反复荷载,得到了不同加载工况下框架时程曲线、恢复力-位移滞回曲线。研究了预应力混凝土装配整体式框架的破坏机制、变形性能、刚度退化及耗能能力等抗震性能。研究结果表明:试验框架梁端率先出现塑性铰,节点核心区有着较强的刚性,提高了框架整体抗侧刚度,在层间位移角达到1/42时,框架梁、柱未产生较严重破坏。采用分析程序DRAIN-2DX对模型结构进行弹塑性动力分析,有限元计算位移值略小于实测位移值。更多还原

【Abstract】 Pseudo-dynamic and pseudo-static test were conducted on tow storey double-span post-tensioned precast prestressed concrete model frame.The frame was first subjected different peak acceleration based on the El Centro ground motion,and then subjected to cyclic loading at starting point of yield displacement.The displacement-history curves and hysteresis curves of restoring force-displacement of experiment under different load condition were recorded and analyzed.The main parameters investigated were the failure mechanism,deformation properties,rigidity degradation and energy dissipation capacity of the frame under seismic action.The results indicate that the plastic hinge first appeared at the end of beam and post-tensioned prestressed beam have strong deformation recovery capabilities.The connections of frame on bi-direction compression enhanced joint stiffness to improve the frame lateral rigidity.The beam and column do not result in more serious damage at story drifts of 1/42.The results obtained from analysis using DRAIN-2DX are compared with the test results,indicating that the displacement of the analytical models is lower than that of the test structure.更多还原