| 青海玛多7.4级地震桥梁工程震害特性分析 |
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| 引用本文： | 管仲国,黄勇,张昊宇,盖海龙,蔡丽雯,绽蓓蕾,刘炜.青海玛多7.4级地震桥梁工程震害特性分析[J].世界地震工程,2021,0(3):038-45. |
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| 作者姓名： | 管仲国 黄勇 张昊宇 盖海龙 蔡丽雯 绽蓓蕾 刘炜 |
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| 作者单位： | 1. 同济大学 土木工程学院桥梁工程系, 上海 200092;2. 中国地震局工程力学研究所, 地震工程与工程振动重点实验室, 哈尔滨 150080;3. 青海省地震局, 西宁 810001 |
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| 摘 要： | 2021年5月22日青海果洛州玛多县发生7.4级地震，导致了显著的桥梁结构震害。本文基于现场调查，介绍了野马滩大桥、野马滩2号桥、黑河中桥、吾儿美岗大桥和雅娘黄河桥的典型震害特征。进一步结合地震断裂与桥位关系、地震台站的地震动记录与特性分析，初步分析了各桥的地震致灾要素和结构失效机理。野马滩大桥和野马滩2号桥整体划一的落梁震害可能系近断层法向的方向性效应所致；黑河中桥的结构轻微震害应系桥台的纵向约束作用，整个桥梁的纵向地震响应类似于整体式桥；吾儿美岗大桥结构南北方向的地震响应高于东西方向，同时减隔震支座与上、下部结构的有效锚固是发挥其减震耗能功效的必要保证；雅娘黄河桥未见水平方向地震作用所导致的显著震害特征，初步推断墩底的压溃破坏可能系震中竖向地震动所致。
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| 关 键 词： | 青海玛多地震 震害调查 桥梁工程 近断层地震 竖向地震 |
Damage characteristics and analysis of bridge engineering in M7.4 Qinghai Maduo earthquake |
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| GUAN Zhongguo,HUANG Yong,ZHANG Haoyu,GAI Hailong,CAI Liwen,ZHAN Beilei,LIU Wei.Damage characteristics and analysis of bridge engineering in M7.4 Qinghai Maduo earthquake[J].World Information On Earthquake Engineering,2021,0(3):038-45. |
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| Authors: | GUAN Zhongguo HUANG Yong ZHANG Haoyu GAI Hailong CAI Liwen ZHAN Beilei LIU Wei |
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| Affiliation: | 1. Department of Bridge Engineering, Tongji University, Shanghai 200092, China;2. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, CEA, Harbin 150080, China;3. Qinghai Earthquake Agency, Xining 810001, China |
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| Abstract: | On May 22, 2021, a M7.4 earthquake occurred in Qinghai Maduo, China, which caused significant damage to bridge engineering.This paper introduces the seismic damage characteristics of the Yematan Bridge, the No.2 Yematan Bridge, the Middle Heihe Bridge, the Wuermeigang Bridge and the Yaning Yellow River Bridge according a field investigation. Combined with the locations of the fault and the bridges, the records of the nearest station and the frequency content of the ground motions, the major feature of the seismic action and the failure of the structures are preliminarily analyzed. The unique collapse failure of the Yematan Bridge and the No.2 Yematan Bridge may due to the forward directivity effect of the near-fault ground motion. The minor damage of the Middle Heihe Bridge is mostly benefited from the constraining effect of the abutments, the response of which is much like an integrate bridge. The response of the Wuermeigang Bridge in the north-south direction is observed larger than in the east-west direction and the fixed connection of the upper and lower plates of the high damping rubber bearings to the superstructure and substructure respectively, is an essential guarantee for the isolation effects. No evident damage from lateral seismic action was observed in the Yaning Yellow River Bridge and thus the crush of the concrete at the base of the piers is believed to be caused by the vertical component of the ground motion at the epicenter. |
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| Keywords: | Qinghai Maduo earthquake field investigation bridge engineering near-fault earthquake vertical component of ground motion |
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