防屈曲支撑框架抗震性能影响因素的模拟分析
Simulation analysis of seismic performance influencing factors for buckling-restrained braced frame structures
张国伟 1常永坤 1丁梦婷 1秦昌安 1李建赢2
作者信息
- 1. 北京建筑大学工程结构与新材料北京高等学校工程研究中心,北京 100044
- 2. 北京建筑大学工程结构与新材料北京高等学校工程研究中心,北京 100044;中国建筑科学研究院有限公司,北京 100013
- 折叠
摘要
本文旨在研究防屈曲支撑(BRB)平面布置方式和抗侧刚度比两种综合因素对防屈曲支撑钢筋混凝土框架(BRBF)的抗震性能影响,以及框架中BRB的合理布置方案.通过采用OpenSees软件建立了 4、8和12层的BRBF空间模型,并进行双向地震作用下的结构弹塑性时程分析,对比分析3种BRB布置方式与5种抗侧刚度比的组合工况下结构抗震性能,基于分析结果综合判定BRB最优布置方案.结果表明:在外框架、内框架和全框架的3种支撑布置方式中地震损伤程度的控制效果分别可达30％、40％和60％,且效果随抗侧刚度比的增加而递增;BRB的设置显著增加了底柱的最大轴力,其中全框架布置方式在3种支撑方式中表现出最优的降低结构竖向反应的效果.BRB最优布置方案组合为内框架布置与刚度比1.0和全框架布置与刚度比2.5.研究成果可为每层采用相同BRB布置方式的规则钢筋混凝土框架结构的加固设计提供参考.
Abstract
This paper aims to investigate the combined effects of spatial arrangement of buckling-restrained braces(BRB)and lateral stiffness ratio on the seismic performance of buckling-restrained brace reinforced concrete frames(BRBF).Additionally,it aims to identify a rational arrangement for BRBs within the frames.Spatial models of 4-story,8-story and 12-story BRBF structures were developed using software OpenSees.Elastic-plastic time-history analyses of the model structures subjected to bi-directional seismic actions were conducted.The seismic performance of the structures was compared under three spatial arrangements for BRBs and five lateral stiffness ratio combinations to determine the optimal configuration of BRBs.The results indicate that the earthquake damage control efficiency of the three configurations for BRBs,namely BRBs arranged on external,internal,and full frames,can achieve approximately 30％,40％,and 60％,respectively.And the efficiency increases with higher lateral stiffness ratios.The installation of BRBs significantly increases the maximum axial force in the bottom columns,and the model of BRBs arranged on full frames is demonstrated to the best performance in reducing vertical structural responses.The optimal combination of arrangement of BRBs and lateral stiffness ratio is a corresponding stiffness ratio of 1.0 for BRBs on internal frames and a stiffness ratio of 2.5 for BRBs on full frames.The research results can provide valuable insights for the retrofitted design of regular reinforced concrete frame structures with the same BRBs arranged on each floor.
关键词
防屈曲支撑框架/OpenSees/刚度比/BRB布置方式/抗震性能Key words
buckling-restrained braced frame/OpenSees/stiffness ratio/BRB arrangement/seismic performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据