基于不同变形模式耗能框剪结构地震响应分析  

Seismic Response Analysis of Energy Dissipation Frame-Shear Wall Structure Based on Different Deformation Modes

作　　者：罗维刚[1,2,3] 祁盼 宋江朋 李兰舟 LUO Weigang;QI Pan;SONG Jiangpeng;LI Lanzhou(Western Center of Disaster Mitigation in Civil Engineering,the Ministry of Education,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Gnsu Key Laboratory of Civil Engineeriny Disaster Prevention and Mitiyation,Lanzhou University 0$Technoloyy,Lanzhou,Gnsu 730050,China;Colleye A Civil Engineeriny,Lanzhou University A Technology,Lanzhoo,Gnsu 730050,China)

机构地区：[1]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [2]甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [3]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《水利与建筑工程学报》2023年第4期109-117,共9页Journal of Water Resources and Architectural Engineering

基　　金：甘肃省建设科技攻关项目(JK2013-18)。

摘　　要：基于地震作用下双重结构体系中两个分体系侧向变形模式的不同,提出一种在两个分体系之间设置BRB的新型耗能结构,以框架剪力墙双重结构为例,建立不同剪力墙与框架抗侧移刚度比耗能双重结构强度模型,输入6条不同特征的地震动记录进行非线性动力时程分析,结果表明:耗能双重结构与传统结构相比,出现了两个分体系模态振型不一致的交互振动,且基本周期增长;在BRB屈服强度设计为相应传统结构连梁内力的10%~33%时,耗能双重结构的峰值加速度、基底剪力、基底弯矩响应与传统结构相比均明显减小,尤其剪力墙响应更为突出,表现出了以框架为主引起的惯性力向剪力墙传递时被“切断”的耗能机制;耗能双重结构相比传统结构框架侧向位移响应有所增大,但合理设计BRB参数可以将层间位移角控制在规范限值内;耗能双重结构中剪力墙与框架抗侧移刚度比越大,峰值加速度响应和基底剪力响应减小越显著,框架侧向位移增大幅度也比较小,结构耗能效果越好。Based on the difference of lateral deformation modes of two subsystems in dual structure system under earthquake action,a new energy dissipative structure with BRB between two subsystems is proposed.The dual structure system of frame-shear wall is taken as an example.The strength model of energy dissipation dual structure with different lateral stiffness ratio of shear wall to frame is established.The nonlinear dynamic time history analysis is carried out by inputting six records of ground motions with different characteristics.The results are as follows.Compared with the traditional structure,the energy dissipating dual structure presents the interaction vibration of the two sub-systems with different mode shapes,and the natural period increases;When the BRB yield strength is 10%F_y~33%F_y of the corresponding traditional structure,the peak acceleration,base shear force and base bending moment response of the energy dissipation structure strength model are significantly reduced compared with the traditional structure,especially the shear wall's,which shows the"cut-off"mechanism when the inertia force caused by gravity frame is transferred to the shear wall;Compared with the traditional structural,the lateral displacement response of the frame is increased,but the inter-story drift angle can be controlled within the code limit by rational design of BRB parameters;The larger the lateral stiffness ratio of shear wall to frame,the smaller the peak acceleration and base shear response,and the better the energy dissipation effect,and the degree of increase of lateral displacement of the frame is relatively smaller.

关 键 词：耗能结构 双重结构体系 变形模式 强度模型 抗侧移刚度比 

分 类 号：TU352[建筑科学—结构工程]