基于IDA的铅黏弹性阻尼减震结构地震易损性研究
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国家重点研发计划(2017YFC0703600);长江学者和创新团队发展计划(IRT13057);广州大学研究生创新能力培养资助计划(2018GDJC-M43);广州市建筑集团有限公司科技计划(2019-KJ019、2019-KJ033)


IDA based seismic fragility analysis of lead viscoelastic damping structure
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    摘要:

    为系统评估铅黏弹性阻尼器(Lead Viscoelastic Damper,LVD)减震设计钢筋混凝土框架结构的抗震性能,设计了8度(0.2g)地区的一栋6层钢筋混凝土抗震框架结构(Reinforced Concrete Frame,RCF)和铅黏弹性阻尼减震框架结构(LVD-damped Frame,LVDF)。使用OpenSees软件建立了RCF结构和LVDF结构的弹塑性分析模型,采用ATC-63推荐的22条远场地震动对RCF和LVDF进行增量动力分析,基于增量动力分析结果对其进行概率地震需求分析和地震易损性分析,定量评估了RCF结构和LVDF结构超越各损伤状态的概率。研究表明:铅黏弹性阻尼器可以有效控制结构地震动响应,使同一地震作用下LVDF结构的地震动响应小于RCF结构;由概率地震需求分析结果可知,铅黏弹性阻尼器可以降低因地震动特性差异导致的结构动力分析结果的离散性;由地震易损性分析结果可知,LVDF结构在不同损伤状态下的超越概率均低于RCF结构,表明铅黏弹性阻尼器可以显著降低结构的损伤,提高结构的抗震性能。

    Abstract:

    To systematically evaluate seismic performance of reinforced concrete frame structure designed with lead viscoelastic damper (LVD), a 6-layer RC frame (RCF) and LVD-damped RC frame (LVDF) in 8 degree (0.2g) were designed and established. Finite analysis models of the RCF and LVDF were built using OpenSees. Incremental dynamic analysis (IDA) was conducted to both RCF and LVDF using a total of 22 far field ground motion records as recommended from ATC-63. Based on results of IDA, probabilistic seismic demand analysis followed with the seismic fragility analysis was carried out for RCF and LVDF, and the probability of achieving different damage states of RCF and LVDF were quantitatively evaluated. The analysis results show that lead viscoelastic damper can be used to seismically control structural dynamic behavior so that structural response of LVDF is smaller than that of RCF under the same earthquake. As shown in results of probabilistic seismic demand analysis, LVD reduce dispersion of structural dynamic analysis results due to differences characteristics of ground motion records. As shown in seismic fragility analysis results, LVDF has lower probability of exceedance under different damage states than that of RCF, indicating that LVD can significantly both release structural damage and improve seismic performance of the structure.

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黄炜元,张超,周云,石菲.基于IDA的铅黏弹性阻尼减震结构地震易损性研究[J].土木与环境工程学报(中英文),2021,43(3):75-82. HUANG Weiyuan, ZHANG Chao, ZHOU Yun, SHI Fei. IDA based seismic fragility analysis of lead viscoelastic damping structure[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2021,43(3):75-82.10.11835/j. issn.2096-6717.2020.179

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  • 收稿日期:2020-07-16
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  • 在线发布日期: 2021-04-09
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