摘要
针对自复位结构耗能能力不足、峰值变形大、高阶振型效应显著和楼面加速度放大等关键问题,提出了基于混合控制手段的自复位结构减控方法。依据ASCE 7-10规范,设计了含三层和九层自复位支撑钢框架(SCBF)、带黏滞阻尼器的自复位支撑钢框架(SCBF+VD)、屈曲约束支撑框架(BRBF)以及屈曲约束支撑和自复位支撑组合形成的"半自复位"钢框架(BRBF+SC)等16个结构体系模型,利用OpenSees有限元软件建立体系模型,进行了静力推覆分析、非线性时程分析和增量动力分析,在此基础上得到基于最大层间位移角的倒塌易损性曲线和基于残余层间位移角的不同损伤状态易损性曲线。结果表明:附加黏滞阻尼器能够有效改善SCBF耗能能力不足的缺陷,缓解并抑制高阶振型效应,附加黏滞阻尼比为0.15时可降低SCBF的顶层层间位移角达88%,同时楼板加速度响应也得到了大幅抑制,甚至低于BRBF的。另外,与BRBF相比,半自复位钢框架可以有效降低残余变形,并且不会显著增加楼面加速度。SCBF+VD的倒塌裕度比均大于BRBF的。最大可能地震(MCE)水准下,采用附加阻尼比为0.15的三层和九层SCBF残余位移损伤状态超越0.2%的概率与SCBF相比从41%降至12%。
A hybrid seismic control method was proposed aiming at solving the key issues,such as insufficient energy dissipation,overly large peak deformation,significant high-mode effect and floor acceleration amplification,of self-centering structures.A total of 16 building structures were designed,including three-story and nine-story self-centering braced frames(SCBFs),SCBFs with additional viscous dampers(SCBF+VD),and"partial"self-centering frames with combined buckling restrained braces(BRBs)and SCBs.These structures were designed in accordance with ASCE 7-10 and the models were established in OpenSees.Pushover analysis,nonlinear time-history analysis and incremental dynamic analysis were carried out.Furthermore,collapse fragility curves based on the peak inter-story drift ratio response and damage fragility curves associated with different damage states(DS)based on the residual drift ratio response were obtained.The results show that the use of the VDs can effectively enhance the energy dissipation capacity and suppress the high-mode effect of the SCBFs,where the roof drift ratio of the SCBF+VD frames with an added viscous damping ratio of 0.15 can be reduced by 88%compared with the SCBFs.The floor acceleration is also significantly reduced.Compared with the BRBF,the combination of BRBs and SCBs for hybrid control can effectively reduce the residual deformation without compromising the floor acceleration response.The collapse margin ratio of the SCBF+VDs frame is larger than that of the BRBF.For SCBFs under the maximum considered earthquake(MCE),the probability of exceeding the 0.2%residual inter-story drift limit decreases from 41%to 12%on average when an added viscous damping ratio of 0.15 is considered.
作者
方成
黄琳婷
王伟
陈以一
FANG Cheng;HUANG Linting;WANG Wei;CHEN Yiyi(State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China;Department of Structure Engineering,Tongji University,Shanghai 200092,China;Arcplus Group PLC East China Architectural Design&Research Institute,Shanghai 200002,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2020年第S02期180-191,共12页
Journal of Building Structures
基金
国家自然科学基金项目(51778456,51778459)
国家自然科学基金重点国际合作项目(51820105013)
关键词
自复位支撑钢框架
黏滞阻尼
混合控制
非线性时程分析
易损性分析
抗震韧性
self-centering steel braced frames
viscous damping
hybrid control
nolinear time-history analysis
fragility analysis
seismic resilience
作者简介
方成,出生于1985年,男,工学博士,副教授,主要从事韧性结构研究。email:chengfang@tongji.edu.cn
