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对16根转换柱试件和1根钢筋混凝土柱对比试件采用“建研式”加载设备完成了低周反复荷载试验,用于研究转换柱的基本抗震行为。建立了转换柱中钢与混凝土的相互作用方式及型钢的受剪模型,并以此为基础分析了型钢延伸高度、型钢配钢率、箍筋配箍率及轴压比对转换柱侧移刚度及侧移刚度退化速率的影响。采用反弯点法计算了转换柱的弹性侧移刚度。通过对试验数据的回归分析,同时引入截面抗弯刚度折减系数用于考虑裂缝及混凝土塑性发展的影响,得到了转换柱屈服点侧移刚度的计算公式,计算值与试验值吻合。
The test specimens of 16 columns and one reinforced concrete column were used to carry out the low cycle repeated loading test using the “R & D style” loading equipment to study the basic seismic behavior of the column. The mode of interaction between steel and concrete in the conversion column and the shear model of steel are established. Based on this, the extension stiffness of steel section, steel ratio of steel section, stirrup ratio of stirrups and axial compression ratio are analyzed. And the effect of lateral stiffness degradation rate. The buckling point method is used to calculate the elastic lateral stiffness of the transfer column. Through the regression analysis of experimental data and the introduction of the reduction factor of the flexural rigidity of the section to consider the influence of the plasticity of the crack and the concrete, the formula of the lateral stiffness of the yield point of the transfer column is obtained. The calculated value agrees well with the experimental data.