Field survey and analysis on near-fault severely damaged high-speed railway bridge in 2022 M6.9 Menyuan earthquake

IF 2.6 2区 工程技术 Q2 ENGINEERING, CIVIL Earthquake Engineering and Engineering Vibration Pub Date : 2024-08-06 DOI:10.1007/s11803-024-2270-8
Lin Xuchuan, Liu Fuxiang, Shan Wenchen
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Abstract

The 2022 M6.9 Menyuan earthquake caused severe damage to a high-speed railway bridge, which was designed for high-speed trains running at speeds of above 250 km/h and is located right next to the fault. Bridges of this type have been widely used for rapidly constructing the high-speed railway network, but few bridges have been tested by near-fault devastating earthquakes. The potential severe impact of the earthquake on the high-speed railway is not only the safety of the infrastructure, trains and passengers, but also economic loss due to interrupted railway use. Therefore, a field survey was carried out immediately after the earthquake to collect time-sensitive data. The damage to the bridge was carefully investigated, and quantitative analyses were conducted to better understand the mechanism of the bridge failure. It was found that seismic action perpendicular to the bridge’s longitudinal direction caused severe damage to the girders and rails, while none of the piers showed obvious deformation or cracking. The maximum values of transverse displacement, out-of-plane rotation and twisting angle of girders reached 212.6 cm, 3.1 degrees and 19.9 degrees, respectively, causing severe damage to the bearing supports and anti-seismic retaining blocks. These observations provide a basis for improving the seismic design of high-speed railway bridges located in near-fault areas.

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2022 年门源 M6.9 地震中近断层严重受损高速铁路桥梁的现场调查与分析
2022 年门源 M6.9 级地震对一座高速铁路桥造成了严重破坏,该桥是为时速 250 公里以上的高速列车设计的,紧邻断层。此类桥梁已被广泛用于高速铁路网的快速建设,但很少有桥梁经受过近断层破坏性地震的考验。地震对高速铁路的潜在严重影响不仅是基础设施、列车和乘客的安全,还包括因铁路使用中断而造成的经济损失。因此,在地震发生后立即进行了实地调查,以收集时效性数据。对桥梁的损坏情况进行了仔细调查,并进行了定量分析,以更好地了解桥梁垮塌的机理。研究发现,垂直于桥梁纵向的地震作用对梁体和栏杆造成了严重破坏,而桥墩没有出现明显的变形或开裂。大梁的横向位移、平面外旋转和扭转角的最大值分别达到 212.6 厘米、3.1 度和 19.9 度,导致支座和抗震挡块严重损坏。这些观测结果为改进位于近断层区的高速铁路桥梁的抗震设计提供了依据。
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来源期刊
CiteScore
4.70
自引率
21.40%
发文量
1057
审稿时长
9 months
期刊介绍: Earthquake Engineering and Engineering Vibration is an international journal sponsored by the Institute of Engineering Mechanics (IEM), China Earthquake Administration in cooperation with the Multidisciplinary Center for Earthquake Engineering Research (MCEER), and State University of New York at Buffalo. It promotes scientific exchange between Chinese and foreign scientists and engineers, to improve the theory and practice of earthquake hazards mitigation, preparedness, and recovery. The journal focuses on earthquake engineering in all aspects, including seismology, tsunamis, ground motion characteristics, soil and foundation dynamics, wave propagation, probabilistic and deterministic methods of dynamic analysis, behavior of structures, and methods for earthquake resistant design and retrofit of structures that are germane to practicing engineers. It includes seismic code requirements, as well as supplemental energy dissipation, base isolation, and structural control.
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