作　　者： ; ; ; ; ;

机构地区： 广州大学土木工程学院

出　　处： 《工程抗震与加固改造》 2010年第2期68-74,80,共8页

摘　　要： 为了解决底部大空间结构上刚下柔,底部框支层变形大的问题,在不影响建筑使用空间的前提下,本文提出在柔性底层设置耗能腋撑以改善转换结构抗震性能。以带梁式转换层的型钢混凝土框架结构为研究对象,利用大型通用有限元程序ETABS对型钢混凝土转换结构及带耗能腋撑型钢混凝土转换结构进行地震反应对比分析,研究耗能器类型与场地土类型对耗能腋撑工作性能和转换结构受力性能的影响作用。研究表明,粘滞型耗能腋撑对本文算例的层间位移角与层间剪力的最大值减幅均可达到36%左右,结构顶层加速度与基底剪力的峰值最大减幅分别为29%和56%;而粘弹型耗能腋撑仅对转换层处有一定减震作用,控制效果不理想;软弱场地与坚硬场地上带耗能腋撑转换结构的减震位移比分别介于0.80～0.90和0.65～0.85之间,耗能腋撑对坚硬场地上转换结构的减震效果较佳。 To control soft-story failure due to large deformations and abrupt changes in story stiffness and strengths at the bottom several stories, and keep fully utilization of architectural floor space, energy dissipation haunch brace is proposed to be installed in the soft bottom stories to improve seismic performances of transfer structure. A steel reinforced concrete （SRC） frame structure with beam transfer story is selected, and seismic performances of the SRC frame structure and SRC frame structure with supplemental energy dissipation haunch brace are studied using ETABS program, the effects of dampers and ground soil on behaviors of energy dissipation haunch brace and transfer structure are thoroughly investigated. Resuhs show that the maximum inter-story drift angle and story shear of SRC transfer structure are decreased about 36% , the peak acceleration of top story and peak value of bottom story shear are decreased 29% and 56% , respectively, by installing viscous energy dissipation haunch braces. Compared with viscous damper, much limited energy dissipation effects can he obtained by adding viscoelastic energy dissipation haunch braces in transfer structures. Compareing SRC transfer structure with supplemental viscous energy dissipation haunch braces buih in stiff and soft ground soil, the damper ratios are 0. 80 - 0. 90 and 0. 65 - 0. 85, respectively, significant energy dissipation effects can be achieved for viscous energy dissipation haunch braces added structures built in stiff ground soil.

关 键 词： 耗能腋撑 转换结构 型钢混凝土框架 耗能减震

领　　域： [建筑科学]