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针对目前常规剪切钢板阻尼器防屈曲构造措施的不足,提出3种改进型防屈曲构造方案,即夹板防屈曲、肋板防屈曲、边框防屈曲方案,以减小焊接残余应力影响和钢板面外变形,改善剪切钢板受力性能。推导了改进型防屈曲剪切钢板阻尼器的基本性能参数(弹性刚度、屈服荷载、屈服位移)理论计算式;通过有限元分析,模拟其单调加载受力性能,分析结果表明其剪切钢板应力分布更加均匀,全截面基本屈服;对改进型防屈曲剪切钢板阻尼器进行低周往复加载试验,结果表明改进型阻尼器约束构造有效。主要参数的理论计算值、有限元分析值和试验值基本吻合,具有稳定的耗能能力和抗低周疲劳性能。
In order to overcome the shortcomings of current buckling preventive measures for conventional shear plate dampers, three kinds of improved buckling preventive schemes are proposed, namely anti-buckling of plates, anti-buckling of stiffeners and anti-buckling of frame. In order to reduce the influence of welding residual stress and the deformation of steel plate External deformation, improve the shear stress performance. The theoretical calculation formulas of the basic performance parameters (elastic stiffness, yield load, yield displacement) of the improved anti-buckling shear plate damper are derived. The monotonic loading behavior is simulated by finite element analysis. The results show that the shear stress The distribution is more uniform and the total cross-section basically yields. The low-frequency reciprocating loading test of the improved buckling-resistant steel plate damper shows that the improved damper restraining structure is effective. The main parameters of the theoretical calculations, the finite element analysis and experimental values basically consistent with a stable energy consumption and low cycle fatigue resistance.