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对一栋缩尺为1∶2的两层单开间预制板砖砌体结构房屋模型进行不同强度地震作用下的双向拟动力试验和非线性地震响应分析,研究该结构在地震作用下的破坏机制、变形、滞回特性及耗能能力等。结果表明:构造柱与圈梁的存在,使得预制板砌体结构具有较好的延性,地震破坏主要集中在底层,即使墙体严重开裂,也不至于整体结构垮塌;双向地震作用下一个方向的承载力与刚度退化会加剧另一个方向承载力与刚度的退化,从而导致砌体结构整体抗震能力的下降;滞回曲线由弓形最后发展到反S形,具有明显的捏缩和滑移效应;建立的砌体结构非线性空间有限元模型,能够反映预制板砌体结构的弹塑性地震响应,计算结果与实测结果基本吻合;两层砌体结构房屋能够满足设计规范的抗震要求。
A two-story single-bay prefabricated brick masonry building with a scale of 1: 2 was used to simulate two-way quasi-dynamic test and nonlinear seismic response under different seismic intensity. The failure mechanism of the structure under earthquake action was studied , Deformation, hysteresis characteristics and energy consumption capacity. The results show that the existence of the structural column and the ring beam makes the prefabricated masonry structure have good ductility, and the seismic damage is mainly concentrated in the bottom layer, even if the wall is severely cracked and the whole structure does not collapse; in one direction under the bidirectional earthquake The degradation of bearing capacity and stiffness will aggravate the degradation of bearing capacity and stiffness in the other direction, resulting in the decrease of the overall seismic capacity of masonry structures. The hysteresis curve finally develops anti-S shape from the arched shape with obvious pinching and sliding effect. The established nonlinear finite element model of masonry structure can reflect the elasto-plastic seismic response of prefabricated masonry structures. The calculation results are in good agreement with the measured results. Two-story masonry building can meet the seismic requirements of design code.