套索式黏滞阻尼器位移放大系数合理取值和布置优化

Reasonable value and layout optimization of displacement amplification coefficient for toggle-brace-dampers system

针对刚度较大、层间位移较小的超高层剪力墙结构,黏滞阻尼器采用套索布置在避难层中,其放大系数的取值和布置方式仍存在不足。套索连接是位移放大装置,通过放大阻尼器轴向行程来提高阻尼器的耗能能力。从几何分析的角度出发,对反向套索连接阻尼器的结构减振率和布置优化进行探讨:推导了反向套索连接阻尼器轴线最大位移的解析式,对比不同布置高度、不同放大系数的套索连接下结构的动力响应。当布置框架跨度过大时,通过设置悬挑桁架的反向套索连接,对比设置前后结构的动力响应。研究结果表明:套索系统效率与布置框架的高度、跨度有关,按角度确定的理论放大系数与结构减振率并不成正比。与原方案布置相比,优化布置后的结构减振率更高。优化方案在实际工程中均得到验证,即合理选取套索放大系数和布置方式能更大化地提高结构的附加阻尼比。

For super high-rise shear wall structures with large stiffness and small inter-story displacements,the viscous dampers are arranged in the refuge floors using toggle-brace-dampers,and there are still deficiencies in the value of the amplification coefficient and the arrangement.The toggle-brace-damper is a displacement amplification device,which improves the energy dissipation capacity of the damper by amplifying the axial travel of the damper.From the perspective of geometric analysis,the structural of the reverse toggle-brace-damper vibration mitigation efficiency and arrangement optimization are explored:The analytical equation for the maximum displacement of the damper axis of the reversed device is derived,and the dynamic response of the structure under the device with different arrangement heights and different amplification factors is compared.When the arranged frame span is too large,the dynamic response of the structure before and after the setup is compared by setting up the device of the overhanging truss.The results show that the efficiency of the toggle-brace-dampers system is related to the height and span of the arranged frame,and the theoretical amplification coefficient determined according to the angle is not proportional to the vibration mitigation efficiency of the structure.The structural vibration mitigation efficiency is higher after the optimized arrangement than the original arrangement.The optimized scheme has been verified in actual projects,i.e.,a reasonable selection of the amplification factor and arrangement can improve the additional damping ratio of the structure to a greater extent.