| 消能自复位摇摆框架墩结构地震反应及易损性分析 |
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| 引用本文： | 周雨龙,韩强,张劲泉,程寿山,王利辉.消能自复位摇摆框架墩结构地震反应及易损性分析[J].中国公路学报,2021,34(11):153-164. |
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| 作者姓名： | 周雨龙 韩强 张劲泉 程寿山 王利辉 |
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| 作者单位： | 1. 交通运输部公路科学研究院 旧桥检测与加固交通行业重点实验室, 北京 100088;2. 北京工业大学 城市与工程安全减灾教育部重点实验室, 北京 100124 |
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| 基金项目： | 国家重点研发计划项目（2018YFC1504306，2017YFE0103000）；国家自然科学基金项目（51838010）；北京市教育委员会资助项目（IDHT20190504）；中国博士后科学基金资助项目（2020M670251）；旧桥检测与加固交通行业重点实验室公开课题项目（2019）；中央级公益性科研院所基本科研业务费专项资金项目（2021-9052a） |
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| 摘 要： | 摇摆构造可限制结构的地震损伤和残余位移，从而提升结构的震后恢复能力。以消能自复位摇摆框架墩结构为研究对象，基于摇摆刚体假定，建立消能自复位摇摆框架墩结构的动力分析模型，并通过试验结果验证了该模型的有效性。模型中采用拉格朗日方程推导出结构的运动学方程，并考虑了桥墩复位碰撞所造成的速度折减以及预应力束和阻尼器的失效。以黄徐路摇摆桥梁结构为工程背景，对消能自复位摇摆框架墩结构进行实例分析、参数分析和易损性分析。实例分析和参数分析结果表明：阻尼器和预应力束的联合应用可减小结构的位移反应，阻尼器刚度的量纲一化参数（ρd）越大则结构减震效果越好，且在脉冲近场地震作用下的减震效果更为明显。针对阻尼器屈服、阻尼器失效、预应力束失效和结构倒塌4个极限状态的易损性分析的结果表明：在E1地震作用下，阻尼器失效、预应力束失效和结构倒塌的发生概率极小；在E2地震作用下，阻尼器极易发生屈服，阻尼器失效和预应力束失效的概率小于20%，结构倒塌的发生概率近乎为0；在脉冲近场地震作用下，ρd增大可降低各极限状态的发生概率，预应力束刚度的增大对各极限状态的发生概率影响较小，预应力束初始应力的增大会增加预应力束失效的发生概率。
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| 关 键 词： | 桥梁工程 摇摆框架墩 刚体分析模型 地震反应 易损性分析 |
| 收稿时间： | 2020-03-19 |
Seismic Response and Fragility Analysis of Post-tensioned Rocking Bridge Frames with Dampers |
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| ZHOU Yu-long,HAN Qiang,ZHANG Jin-quan,CHENG Shou-shan,WANG Li-hui.Seismic Response and Fragility Analysis of Post-tensioned Rocking Bridge Frames with Dampers[J].China Journal of Highway and Transport,2021,34(11):153-164. |
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| Authors: | ZHOU Yu-long HAN Qiang ZHANG Jin-quan CHENG Shou-shan WANG Li-hui |
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| Affiliation: | 1. Key Laboratory of Old Bridge Inspection and Reinforcement Technology Industry, Research Institute of Highway Ministry of Transport, Beijing 100088, China;2. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | Rocking connections can limit the seismic damage and residual displacement of structures, which can improve the post-earthquake resilience of structures. A dynamic analytical model of a post-tensioned rocking bridge frame with dampers was developed based on the assumption of rocking rigid bodies, which was validated by experimental results. In the analytical model, the Lagrange equation was adopted to deduce the kinematic equation. In addition, the impact reduction coefficient of the columns was derived, and the failure of post-tensioned tendons and dampers was considered. Case studies, parameter analysis, and fragility analysis were performed based on the Huangxulu Rocking Bridge. From the results of the case studies and parameter analysis, it can be concluded that the hybrid application of dampers and post-tensioned tendons can decrease the seismic displacement response of this bridge frame. The increase in the dimensionless stiffness parameter of dampers (ρd) can enhance the decrease, which is especially obvious under near-field motion with pulses. The four limit states for fragility analysis comprise damper yielding, damper failure, pre-stressed tendon failure, and structure overturning. Under E1-level earthquakes, the probabilities of damper failure, pre-stressed tendon failure, and structure overturning are extremely low. Under E2-level earthquakes, the probability of damper yielding is extremely high, the probabilities of the failure of the damper or pre-stressed tendon are less than 20%, and the probability of the structure overturning is close to zero. Under near-field motion with pulses, the increase in ρd can decrease the probability of each limit state, the increase in stiffness of post-tensioned tendons has little influence on the probability of each limit state, and the increase in the initial stress of post-tensioned tendons can increase the probability of pre-stressed tendon failure. |
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| Keywords: | bridge engineering rocking frame column rigid-body analytical model seismic response fragility analysis |
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