消能摇摆钢框架结构地震反应的计算方法  

Calculation method of seismic response for steel frame coupledwith rocking structure and dampers

作　　者：张文津 李国强[2] 胡晓华 张惊宙 黄博滔[4] 赵生智 ZHANG Wenjin;LI Guoqiang;HU Xiaohua;ZHANG Jingzhou;HUANG Botao;ZHAO Shengzhi(Zhejiang Construction Co.Ltd,China Construction Eighth Engineering Division,Hangzhou 310000,China;College of Civil Engineering,Tongji University,Shanghai 200092,China;College of Civil Engineering,Guangzhou University,Guangzhou 510000,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]中建八局浙江建设有限公司,浙江杭州310000 [2]同济大学土木工程学院,上海200092 [3]广州大学土木工程学院,广东广州510000 [4]浙江大学建筑工程学院,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2024年第9期1866-1873,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家十四五重点研发计划资助项目(2022YFC3801900).

摘　　要：消能摇摆钢框架结构(SRF)通过摇摆钢桁架抑制各楼层发生不均匀地震变形,通过位于转动底脚的阻尼器消耗地震输入能量,抗震性能良好.推导消能摇摆钢框架结构的弹性计算方法,提出SRF等效单自由度(SDOF)分析模型,基于等效线性化原理给出SRF非线性地震反应的计算方法.采用ATC-63推荐的地震动记录集进行结构弹塑性地震反应分析,得到SRF在3类地震动激励下的延性需求谱.研究表明,由弹性计算方法可以得到SRF在水平作用下的力学反应,等效单自由度分析模型能准确描述整体结构的受力机理和非线性地震反应,依此推导所得的SRF地震反应计算方法可用于预估实际结构的地震反应.相比于普通钢框架结构,SRF屈服后刚度比的取值范围更大,计算所得的延性需求谱与之匹配,可作为设计参考.Steel frame coupled with rocking structure and dampers(SRF)achieves superior seismic behavior under earthquake excitation,with nonuniform inter-story drift restrained by rocking truss structure and inputting-energy dissipated by dampers located around rotational point.The elastic calculation method of SRF was deduced.The equivalent model of single degree of freedom(SDOF)was established for SRF and the evaluation method of nonlinear seismic response for SRF was promoted by equivalent linearization method.Meanwhile,the ductility demand spectra under three types of earthquake records recommended by ATC-63 was developed based on timehistory dynamic analysis results.Results show that the elastic calculation method can be used to calculate the structural response of SRF under lateral loads.Structural mechanism and nonlinear seismic response under earthquake excitation can be accurately evaluated by the equivalent model of SDOF and the seismic response of actual structure can be predicted by the deduced seismic response calculation method of SRF.Ductility demand spectra for SRF obtained by SDOF is appropriate to the fact that post-yield ratio of SRF is greater than that of the steel-frame structures,which can be referred in the practical design.

关 键 词：摇摆结构 阻尼器 地震反应 等效单自由度模型 延性需求谱 

分 类 号：TU4[建筑科学—土工工程]