【摘要】 通过对一榀三层预压装配式混凝土框架的拟静力试验,了解框架承载力和破坏模式,得到框架位移滞回曲线、梁端转角滞回曲线,研究预压装配式混凝土框架的破坏机制、刚度退化、滞回性能、耗能能力、梁端转角延性等抗震性能。研究结果表明:在低周反复荷载作用下,框架梁端率先出现塑性铰,梁端截面转角延性系数在3.64至5.62之间;节点在柱轴向压力和水平预应力的共同作用下,核心区处于双向受压状态,节点的抗裂性能、框架整体抗侧刚度和变形恢复能力较好;加载至框架层间位移角为1/42～1/67时,框架承载能力没有出现明显下降,预压装配式框架属"强柱弱梁"型结构。更多还原

【Abstract】 Based on the pseudo static experimental study of a specimen of three story post-tensioned precast concrete frame,this paper investigated the load-bearing capacity and the failure mode of frame,the story shear-displacement hysteresis curve of frame and the moment-rotation hysteresis curves at both ends of the beams.The research included the seismic performance of failure mechanism,rigidity degradation,hysteretic behavior,rotation ductility and etc.The results indicate that the plastic hinges first appear at the ends of beam at lower stories and the rotation ductility coefficient is between 3.64 and 5.62 with good ductility.The connections are under bi-directional compression caused by column axial pressure and horizontal prestressing stress.The cracking resistance of the connection,the frame lateral stiffness and deformation recovery can be improved greatly compared with those of ordinary frames.The load carrying capacity of frame can be sustained without serious degradation at story drifts between 1/42 and 1/67.The post-tensioned prestressed precast concrete frame is a ’strong column weak beam’ structure.更多还原