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进行了4榀底部框架、上部密肋复合墙结构墙梁大比例模型的抗震性能试验,研究了墙梁在低周反复荷载作用下的破坏过程及特征、滞回及耗能特性、承载力、位移延性、刚度退化以及抗倒塌能力。试验结果分析表明:多层框支密肋复合墙结构墙梁以剪切型破坏为主,结构具有较高的承载能力、较大的延性和较好的抗倒塌能力;墙梁的组合作用效应显著,托梁支座斜截面受剪承载力为其主要控制因素;上部密肋复合墙体呈现“填充砌块-密肋框格-隐形框架”依次开裂的破坏特征,有利于保证结构的抗震安全性能;在洞口设置构造柱和过梁能够保证结构的承载力和刚度基本不变,但试件的延性会有所降低;密肋复合墙体的水平承载力和抗侧刚度较大,应注意合理控制结构上下刚度和承载力的分布,可通过在底层增设密肋复合墙或对密肋框格进行优化设计予以实现。
The seismic performance test of the large-scale model with 4 榀 bottom frame and upper ribbed composite wall structure beam was carried out. The failure process and characteristics of the wall beam under low cyclic loading were studied. The hysteretic and energy dissipation characteristics, bearing capacity, Displacement ductility, stiffness degradation and anti-collapse ability. The analysis of the test results shows that the shear wall is mainly composed of shear failure, and the structure has high carrying capacity, large ductility and good anti-collapse ability. The combined effect of wall beams Significantly, the shear bearing capacity of the joist section is the main control factor. The upper multi-ribbed composite wall shows the failure characteristics of “filling block-dense rib box-stealth frame” Of the seismic safety performance; in the hole to set the structure of columns and beams to ensure that the structure of the bearing capacity and stiffness remain unchanged, but the ductility of the specimen will be reduced; the horizontal bearing capacity and stiffness of the multi-ribbed composite wall greater stiffness , Attention should be paid to the rational control of the structure of the upper and lower stiffness and bearing capacity distribution can be through the addition of multi-ribbed composite wall at the bottom or to optimize the design of the dense rib box to be achieved.