| 玛多地震中大野马岭大桥震害机理分析 |
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| 引用本文： | 黄勇,宋光有,李国昌,俎林,蔡丽雯.玛多地震中大野马岭大桥震害机理分析[J].世界地震工程,2021,0(4):012-20. |
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| 作者姓名： | 黄勇 宋光有 李国昌 俎林 蔡丽雯 |
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| 作者单位： | 1. 中国地震局工程力学研究所, 中国地震局地震工程与工程振动重点实验室, 哈尔滨 150080;2. 青海省地震局, 西宁 810001 |
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| 摘 要： | 2021年5月22日青海玛多发生了Ms7.4级地震，从地震中桥梁震害情况看:此次地震的特点是断层北侧震害轻，南侧震害重。位于断层南侧的野马滩大桥是简支梁桥，发生大量落梁，是此次地震中受损最为严重的大桥之一；而位于北侧的大野马岭大桥是连续梁桥，仅发生了部分挡块开裂。其中原因值得深入研究。本文通过有限元分析软件Midas/Civil建立大野马岭大桥（上行线）模型，进行地震反应分析，讨论分析了大野马岭大桥在此次地震中的震害机理。发现南北向的地震动是造成该桥横向挡块破坏的主要原因，东西向地震动因受到桥台和纵向挡块的约束并没有出现严重损伤。若将该桥由连续梁桥变成简支梁桥，地震反应会有所变化，但总体趋势特点变化并不大。另外，本文通过现有资料选定5组地震动作为输入，进行地震反应分析，比较分析不同地震动对该桥的影响，并验证地震动模拟效果。
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| 关 键 词： | 青海玛多地震 大野马岭大桥 震害机理 地震动模拟 |
Analysis of damage mechanism of Dayemaling bridge during the Maduo earthquake |
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| HUANG Yong,SONG Guangyou,LI Guochang,ZU Lin,CAI Liwen.Analysis of damage mechanism of Dayemaling bridge during the Maduo earthquake[J].World Information On Earthquake Engineering,2021,0(4):012-20. |
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| Authors: | HUANG Yong SONG Guangyou LI Guochang ZU Lin CAI Liwen |
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| Affiliation: | 1. Institute of Engineering Mechanics, Institute of Enginerring Mechanics;Key Laboratory of Earthquake Engineering and Engineering Vibration of CEA, Harbin 150080, China;2. Seismological Bureau of Qinghai Province, Xining 810001, China |
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| Abstract: | On May 22, 2021, a Ms7.4 earthquake occurred in Maduo, Qinghai. From the perspective of bridge damage in the earthquake, the characteristics of this earthquake are light damage on the north side of the fault and heavy damage on the south side of the fault. The Yematan Bridge, which located on the south side of the fault, is a simply supported girder bridge with a large number of girders drops. It is one of the most severely damaged bridges in the earthquake. The Dayemaling Bridge, which located on the north side is a continuous girder bridge, and only part of the stopper cracked. The reason is worthy of in-depth study. This paper uses the finite element analysis software Midas/Civil to establish a model of the Dayemaling Bridge, conduct seismic response analysis, and discuss and analyze the damage mechanism of the Dayemaling Bridge in this earthquake. It is found that the north-south ground motion is the main cause of the damage to the lateral block of the bridge, and the east-west ground motion is constrained by the abutment and the longitudinal block and there is no serious damage. If the bridge is changed from a continuous girder bridge to a simply supported girder bridge, the seismic response will change, but the overall trend characteristics will not change much. In addition, this paper selects 5 sets of ground motions as input based on existing data, conducts seismic response analysis, compares and analyzes the impact of different ground motions on the bridge, and verifies the effect of ground motion simulation. |
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| Keywords: | maduo earthquake Dayemaling bridge earthquake damage mechanism earthquake motion simulation |
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