Seismic safety assessment with non-Gaussian random processes for train-bridge coupled systems

IF 2.6 2区 工程技术 Q2 ENGINEERING, CIVIL Earthquake Engineering and Engineering Vibration Pub Date : 2024-01-24 DOI:10.1007/s11803-024-2235-y
Han Zhao, Lei Gao, Biao Wei, Jincheng Tan, Peidong Guo, Lizhong Jiang, Ping Xiang
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Abstract

Extensive high-speed railway (HSR) network resembled the intricate vascular system of the human body, crisscrossing mainlands. Seismic events, known for their unpredictability, pose a significant threat to both trains and bridges, given the HSR’s extended operational duration. Therefore, ensuring the running safety of train-bridge coupled (TBC) system, primarily composed of simply supported beam bridges, is paramount. Traditional methods like the Monte Carlo method fall short in analyzing this intricate system efficiently. Instead, efficient algorithm like the new point estimate method combined with moment expansion approximation (NPEM-MEA) is applied to study random responses of numerical simulation TBC systems. Validation of the NPEM-MEA’s feasibility is conducted using the Monte Carlo method. Comparative analysis confirms the accuracy and efficiency of the method, with a recommended truncation order of four to six for the NPEM-MEA. Additionally, the influences of seismic magnitude and epicentral distance are discussed based on the random dynamic responses in the TBC system. This methodology not only facilitates seismic safety assessments for TBC systems but also contributes to standard-setting for these systems under earthquake conditions.

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使用非高斯随机过程对火车-桥梁耦合系统进行地震安全评估
四通八达的高速铁路(HSR)网络就像人体错综复杂的血管系统,纵横交错地横穿大陆。由于高铁的运营时间较长,以不可预测著称的地震事件对列车和桥梁都构成了重大威胁。因此,确保主要由简单支撑梁桥组成的列车-桥梁耦合(TBC)系统的运行安全至关重要。蒙特卡洛法等传统方法无法有效分析这一复杂系统。相反,新的点估计法结合力矩扩展近似(NPEM-MEA)等高效算法被用于研究数值模拟 TBC 系统的随机响应。采用蒙特卡罗方法对 NPEM-MEA 的可行性进行了验证。对比分析证实了该方法的准确性和高效性,建议 NPEM-MEA 的截断阶数为 4 至 6 阶。此外,基于 TBC 系统的随机动态响应,还讨论了地震震级和震中距的影响。该方法不仅有助于对 TBC 系统进行地震安全评估,还有助于为这些系统制定地震条件下的标准。
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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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