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基于增量动力分析法的高层建筑-阻尼器系统地震易损性分析
国巍1,2, 曾晨1, 潘毅3, 赖炜煌4, 胡思远3
1.中南大学 土木工程学院, 长沙 410075;2.中南大学 高速铁路建造技术国家工程实验室, 长沙 410075;3.西南交通大学 土木工程学院, 成都 100191;4.同济大学 土木工程学院, 上海 200092
摘要:
高层建筑在远场强地震下可能发生严重震害,通常在建筑中设置阻尼器实现消能减震,降低建筑物主体结构地震响应以减轻震致破坏。现行建筑抗震设计规范已经给出了建筑中阻尼器的通用设计方法,然而,建筑-阻尼器系统在强地震下的实际响应是否与设计结果有所偏差、在同一设防目标下不同类型阻尼器的性能是否存在差异尚不清楚。基于现行建筑抗震设计规范,设计了20层钢框架结构以作为阻尼器性能评估的Benchmark模型,并以同一减震目标设计了3类典型阻尼器:摩擦阻尼器、粘滞阻尼器和防屈曲支撑,基于所拟合的阻尼器试验曲线,对阻尼器进行参数设计,给出了典型阻尼器的数值模型。基于场地类型选取了10条地震动进行增量动力分析,对比评估了3类典型阻尼器对结构抗倒塌性能的控制效果。采用基于位移的结构性能水准评价指标,研究了3类典型阻尼器的减震控制效果,结果表明,对于采用基于中国规范设计的高层建筑-阻尼器系统,速度型的粘滞阻尼器控制效果最优,位移型的摩擦阻尼器和防屈曲支撑次之,且性能相近。
关键词:  框架结构  阻尼器  远场地震动  增量动力分析  地震易损性
DOI:10.11835/j.issn.2096-6717.2019.072
分类号:TU973
基金项目:国家重点研发计划(2016YFC0802205);长江学者和创新团队发展计划(IRT1296);湖南省青年骨干教师项目(150220077)
IDA based seismic fragility analysis of high-rise building-damper system
Guo Wei1,2, Zeng Chen1, Pan Yi3, Lai Weihuang4, Hu Siyuan3
1.School of Civil Engineering, Central South University, Changsha 410075, P. R. China;2.National Engineering Laboratory of High Speed Railway Construction, Central South University, Changsha 410075, P. R. China;3.School of Civil Engineering, Southwest Jiaotong University, Chengdu 100191, P. R. China;4.School of Civil Engineering, Tongji University, Shanghai 200092, P. R. China
Abstract:
High-rise building may experience severe damage under far field strong earthquake. A common measure to reduce the seismic damage is using dampers which can mitigate the response of the structure. Current seismic design code has already been implemented with a general damper design method. However, whether the actual seismic response of the building deviates from the design, and whether the performance of different dampers under the same seismic precaution is different, are still unknown. In this study, firstly, a 20-story steel frame structure based on current seismic design code is established as the Benchmark model, and three different types of typical dampers, including friction damper, vicious damper and buckling-restrained brace are designed under the same control target. Numerical models of the three types of dampers are established according to the fitting of damper experiment curves. Based on the site types, ten ground motions have been selected for incremental dynamic analysis, and the control effect of the structural collapse resistance of the three types of typical dampers were compared. In the meantime, displacement-based structural seismic performance level is taken as the evaluation indicator to compare the control effect of three types of typical dampers, respectively. The results show that for the high-rise building-damper system designed according to the Chinese code, the viscous damper performs the best, followed by friction damper and buckling-restrained brace.
Key words:  steel frame structure  damper  far field earthquake  IDA analysis  seismic fragility
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