偏心框剪结构基于多模态的耗能减震设计研究  

Research on multimode-based energy dissipation design for eccentric frame-shear wall structures

作　　者：李慧[1,2] 黄小宁[1] 杜永峰[1,2] 

机构地区：[1]兰州理工大学防震减灾研究所,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《建筑结构》2014年第4期69-73,共5页Building Structure

基　　金：国家自然科学基金资助项目(50978130)

摘　　要：结合能力谱法的基本原理,运用基于多模态的耗能减震设计方法对偏心框剪结构进行性能化设计。提出附加阻尼器后结构的性能目标,并对原结构各阶模态进行Pushover分析,得到各阶模态等效单自由度体系最大位移的比值,利用SRSS法将目标位移用第1阶等效单自由度体系的最大允许位移表示。同时依据能力谱法的基本原理计算结构所需附加阻尼比,并根据阻尼系数与层间位移成正比的分配模式对所选粘滞阻尼器进行合理的布置。对原结构与附加阻尼器结构进行时程分析,计算结果表明:附加阻尼器后,结构的位移响应减小较多,层间位移角趋于均匀,其抗震性能可达到预先提出的性能目标。Combined with the principle of capacity spectrum method, muhimode-based energy dissipation design method was used to carry out the performance-based design for eccentric frame-shear wall structures. Performance objectives of the structure with dampers were proposed. Ratios of the maximum displacements of equivalent single degree of freedom （SDOF） systems were obtained by Pushover analysis on all the modes of original structure. SRSS method was used to represent the objective displacement with the maximum allowable displacement of the first-order equivalent SDOF system. The supplement damping ratio was calculated based on capacity spectrum method, and then the selected viscous dampers were placed properly according to the distribution model in direct proportion to the damping parameter and interstory displacement. Finally, structures with and without dampers were analyzed by time-history analysis method. Comparison of the results shows that after the set of dampers, displacements of the structure reduce obviously and interstory angles of the structure become uniform. The structure with dampers can reach the proposed performance objectives.

关 键 词：偏心框架-剪力墙结构 粘滞阻尼器 多模态 阻尼比 性能目标 

分 类 号：TU352.1[建筑科学—结构工程]