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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。
Pseudo-static and quasi-static tests were carried out on one span of two span two-story prestressed concrete frame, El Centro seismic waves with different acceleration peaks were used to excite the load and the low cycle repeated load was applied with the yield displacement of the pseudo-dynamic test , The frame time history curve, restoring force - displacement hysteresis curve under different loading conditions were obtained. The failure mechanism, deformation performance, stiffness degradation and energy dissipation capacity of prestressed concrete monolithic frame are studied. The results show that the plastic hinge is firstly appeared at the beam end of the test frame, and the core area of the node has strong rigidity and improves the overall lateral stiffness of the frame. When the displacement angle between layers reaches 1/42, no serious damage occurs to the frame beams and columns . The analytical program DRAIN-2DX is used to elastoplastic analysis of the model structure. The displacement calculated by finite element method is slightly smaller than the measured displacement.