| 跨断层地震动及其对桥梁结构影响研究进展 |
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| 引用本文： | 宗周红,林元铮,林津,黎雅乐.跨断层地震动及其对桥梁结构影响研究进展[J].中国公路学报,2023,36(1):80-96. |
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| 作者姓名： | 宗周红 林元铮 林津 黎雅乐 |
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| 作者单位： | 1. 东南大学 爆炸安全防护教育部工程研究中心, 江苏 南京 211189;2. 东南大学 土木工程学院, 江苏 南京 211189;3. 江苏开放大学 建筑工程学院, 江苏 南京 210036 |
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| 基金项目： | 国家自然科学基金项目（52108441，52008187）；中央高校基本科研业务费专项资金项目（2242021k30021） |
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| 摘 要： | 与常规地震动激励的情况相比，跨断层地震动作用下桥梁结构具有更复杂的动力响应、更大的地震需求以及更严重的地震损伤。伴随着川藏铁路等超级基础工程的开工建设，越来越多的桥梁具有跨越潜在断层的风险，相关研究亟待开展。从跨断层桥梁震害出发，首先阐述了近/跨断层地震动的基本特性并介绍了相关模拟方法，然后综述了跨断层桥梁抗震分析理论、数值模拟和模型试验等研究的相关进展，进而归纳了考虑跨断层地震动作用的应对策略。结果表明：现有的跨断层地震动模拟方法合理可行，但存在一定的应用条件和改进空间；跨断层桥梁研究对象大多为中小跨径梁桥，其地震响应和损伤破坏模式受断层类型、跨越位置、跨越角度、永久位移等多因素影响；针对跨断层桥梁的减隔震和防落梁限位措施等技术得到初步发展。最后展望了未来跨断层桥梁抗震研究的发展方向，主要包括：发展更为精确、高效的跨断层地震动模拟技术；开展大跨径桥梁的跨断层振动台台阵试验及倒塌数值模拟研究；突破跨断层桥梁振动台台阵试验技术瓶颈；明确跨断层地震动参数对不同类型桥梁结构地震损伤机理的影响规律；进一步发展相应的减隔震技术、防落梁措施以及韧性防控技术，并进行试验验证等。
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| 关 键 词： | 桥梁工程 抗震性能 综述 跨断层 地震动模拟 地震响应 地震损伤 应对策略 |
| 收稿时间： | 2021-06-11 |
Research Advances of Across-fault Ground Motions and Their Effects on Bridge Structures |
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| ZONG Zhou-hong,LIN Yuan-zheng,LIN Jin,LI Ya-le.Research Advances of Across-fault Ground Motions and Their Effects on Bridge Structures[J].China Journal of Highway and Transport,2023,36(1):80-96. |
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| Authors: | ZONG Zhou-hong LIN Yuan-zheng LIN Jin LI Ya-le |
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| Affiliation: | 1. Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China;2. School of Civil Engineering, Southeast University, Nanjing 211189, Jiangsu, China;3. Department of Building Engineering, Jiangsu Open University, Nanjing 210036, Jiangsu, China |
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| Abstract: | Compared to scenarios under conventional ground motions, bridge structures subjected to across-fault ground motions have more complicated dynamic responses, larger seismic demands, and more severe seismic damage. With the development of super-infrastructure, such as the Sichuan-Tibet railway, an increasing number of bridges are facing the hazard of crossing potential faults; therefore, relevant studies are urgently needed. Based on the seismic damage of fault-crossing bridges, this paper first demonstrates the basic characteristics of near- and across-fault ground motions and introduces the relevant simulation methods. Then, studies on the analysis theory, numerical simulation, and model tests of fault-crossing bridges are reviewed, and coping strategies against the fault-crossing effect are summarized. The results show that the current simulation methods of across-fault ground motions are generally reasonable and feasible, but certain application conditions exist and improvements are needed; the studies on fault-crossing bridges mainly focus on middle- and small-span girder bridges, and the seismic responses and damage modes of bridges are affected by multiple factors, including fault type, fault-crossing location, fault-crossing angle and permanent displacement. The seismic isolation technique and the anti-collapse displacement restriction measurements for fault-crossing bridges have achieved preliminary improvements. Finally, development orientations for future studies on fault-crossing bridges are proposed in this study. In particular, more accurate and efficient simulation techniques for across-fault ground motions need to be developed; shake table array tests and numerical studies on long-span fault-crossing bridges need to be conducted, the difficulties with the experimental technique of shake table array tests for fault-crossing bridges need to be solved, the influences of ground motion parameters on different types of fault-crossing bridges need to be explicitly pointed out, and seismic isolation, anti-collapse, and resilient techniques should be further developed and experimentally validated. This study can provide a reference for the simulation of across-fault ground motions and the analysis and design of fault-crossing bridges. |
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| Keywords: | bridge engineering seismic performance review fault-crossing ground motion simulation seismic response seismic damage coping strategy |
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