对称双塔连体结构采用粘滞流体阻尼器的消能减震分析

根据双轴对称双塔连体结构在水平地震作用下的受力和变形特点,在连体位置设置斜向粘滞流体阻尼器对结构进行消能减震。分析了结构各种响应随阻尼系数的变化情况,结果表明存在一个最优的阻尼系数使得结构的响应取得最小值。在对阻尼系数进行优化的基础上,详细研究了结构在小震和大震下的减震效果,计算表明,在采用最优阻尼系数的条件下,结构的最大层间剪力、层间相对位移和楼层位移等各指标都有较好的减震效果。但在大震作用下,由于结构进入塑性后本身的阻尼比增加了,阻尼器的耗能比例相对降低,其减震效果没有小震时明显。

Energy Dissipation and Vibration Reduction of the Biaxial-symmetric Two-tower-connected Structure with Fluid Viscous Dampers

Based on the load-bearing and deforming behavior of the biaxial-symmetric tuo-tower-connected structure,the fluid viscous dampers are used at the location of the connecting part to dissipate energy and reduce the vibration of the structure.The variation of the structure response with the changing damping factor is analyzed and an optimized damping factor is found to achieve minimum structural response.By optimizing the damping factor,the vibration reducing effect of viscous fluid damper on the structure is investigated in detail under both large and small earthquakes.The calculation has shown that by applying optimal damping factor,satisfactory vibration reducing effect can be obtained in terms of major structural parameters,such as the maximum shear force between stories,relative displacement between stories and story displacement.However,due to the increasing damping ratio after the structure enters plastic phase under a large earthquake,the energy dissipation ratio of the dampers will relatively decrease,therefore,the vibration reducing effect will not be so notable as that of the dampers under a small earthquake.