位移与速度型消能器在某不规则建筑结构抗震设计中的混合应用

 某工程为细腰不规则超限结构, 选择纯框架结构, 扭转周期比和层间位移角均不满足规范要求。考虑到建筑外立面效果, 不能在外立面布置剪力墙, 同时在不影响建筑使用功能的前提下, 也没有合适的位置布置全部钢支撑。因此, 经方案比选采用了附加黏滞流体阻尼器和屈曲约束支撑的消能减震结构方案。运用ETABS 结构分析软件, 建立三维有限元模型, 采用振型分解反应谱法对无控结构、附加黏滞流体阻尼器结构和同时附加黏滞流体阻尼器及屈曲约束支撑结构进行计算分析, 对比分析了3 种结构的动力特性和地震反应。最后, 采用时程分析法对振型分解反应谱法进行了补充计算。结果表明, 黏滞流体阻尼器降低了结构的地震反应, 而屈曲约束支撑降低结构地震反应的同时增加了结构刚度, 有效控制了结构的扭转效应。

Combined application of displacement-related and velocity-related energy dissipation devices in the aseismic design of an irregular building structure

A wasp-waisted and irregular overrun building is in consideration. When a pure frame structure is selected, the torsional period ratio and the inter-story drift do not satisfy the requirements in the standards. In view of the external elevation appearance, the arrangement of shear walls on the front plane is not allowed. And there is no suitable position for laying all steel bracing. After a comparison of various schemes, the seismic control plan is designed by using fluid viscous dampers and buckling-restrained braces. In this paper, a three-dimensional finite element model of the structure is established by the ETABS for the calculations of the uncontrolled structure, the structure installed with fluid viscous damper and the structure installed with fluid viscous damper and buckling-restrained brace by the modal shape decomposition response spectrum method. Then, the comparison and analysis of the dynamic characteristics and the seismic response of the three structures are made. Finally, the time-history analysis is carried out. The results show that the fluid viscous damper and the buckling-restrained brace can all reduce the seismic responses effectively. Besides that, the buckling-restrained braces can control the torsion effectively.