新型带耗能支撑-分散核心筒结构的抗震性能研究  

Study on seismic performances of a new decentralized core tubes structure with energy dissipating braces

作　　者：吴轶[1] 杨春[2,3] 王俊然 陈麟[1] 张春梅[1] Wu Yi;Yang Chun;Wang Jun-ran;Chen Lin;Zhang Chun-mei(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广州大学土木工程学院,广东广州510006 [2]华南理工大学土木与交通学院,广东广州510640 [3]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《工程抗震与加固改造》2020年第5期133-140,147,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51578246);亚热带建筑科学国家重点实验室开放课题(2019ZB)。

摘　　要：为了解决强震作用下核心筒底部损伤严重问题,提出把刚度高度集中的核心筒离散成多个分散筒体,分散筒之间采用框架梁和耗能斜撑联系,建立多道设防的新型带耗能支撑-分散核心筒结构。本文从结构整体响应、构件材料损伤、结构耗能等方面对比普通和新型耗能框架-核心筒结构抗震性能差异,并研究结构的地震损伤模式。研究结果表明:两种结构侧移和侧向刚度等整体响应相差不大。强震作用下,相比传统核心筒结构,新型核心筒结构混凝土受压应变最大减少65%,钢筋受拉应变最大降低55%;滞回耗能主要分布在防屈曲支撑、连梁,少部分分布在剪力墙、框架和钢管混凝土暗柱上。新型核心筒结构中剪力墙总滞回耗能以及底部剪力墙滞回耗能均最少降低50%。防屈曲耗能支撑耗散了超过50%结构总塑性耗能,在结构高度的1/10至4/5范围内充分起到了耗能作用,大大减少了墙肢的损伤程度,地震损伤模式更为合理。To solve the problem of severe damage at the bottom of core tubes structure under strong earthquakes,a decentralized core tubes structure,connected by frame girders and energy-dissipation diagonal braces,instead of highly centralized rigidity in normal core tubes structure is proposed,multi-fortification can be achieved in the new decentralized core tubes structure with energy dissipating braces.In the paper,seismic performance differences between normal and new dissipating core tube structure are compared according to integral seismic responses,material damage of structural members,structural dissipation and seismic damage patterns.The research results show that the two structures hold similar integral seismic responses including structural lateral drifts and rigidity.Under strong earthquakes,compared with normal core tubes structure,concrete compression strain in new core tube structure decrease maximally 65%,and tension strain of steel bars decrease maximally 55%.In new structure,hysteresis energy consumption distributes mainly in energy-dissipation diagonal braces,coupling beams,only small part of energy consumption disperses in shear wall,frames and concrete filled steel tube columns.Total hysteresis energy consumption in shear walls and bottom shear walls reduce at least 50%.Along 1/10 to 4/5 height of the structure,energy-dissipation diagonal braces function very well,consume over 50%total hysteresis energy consumption.Therefore,damage of shear walls in core tubes can be significantly decreased,the seismic damage pattern of the new structure is more reasonable.

关 键 词：框架-核心筒 分散筒 耗能支撑 材料损伤 地震能量耗散 

分 类 号：TU352.1[建筑科学—结构工程]