ABSTRACT

Pier settlement is unavoidable in bridge construction and operation processes, thus the influence of pier settlement on the train-track-bridge coupled system becomes a classic and meaningful topic in railway engineering. Aiming at this practical problem, three interesting works are conducted in this paper: (a) a detailed single-pier settlement model (SPSM) is developed with analytic method; (b) a multi-pier settlement model (MPSM) is also analytically established in detail; and (c) the influences of SPSM and MPSM on the train-track-bridge system are investigated and compared. On this basis, the application ranges for different pier settlement models are suggested from static and dynamic perspectives. Results show that, from static perspective, SPSM and MPSM have the similarity, and results obtained from MPSM are the superposition of results calculated by SPSM. Computational efficiency of MPSM is lower than that of SPSM due to the large model scale. SPSM is suggested to study the static performance of the coupled system and to perform parametric analysis in dynamic investigation, while MPSM is suggested to investigate the system dynamics in frequency-domain.

摘要

桥墩沉降在桥梁建设和运营过程中是不可避免的，因此桥墩沉降对列车-轨道-桥梁耦合系统的影响成为铁路工程中一个经典而有意义的课题。针对这一实际问题，本文进行了三项有趣的工作：(a) 用解析方法开发了详细的单墩沉降模型 (SPSM)；(b) 还详细分析建立了多码头结算模型（MPSM）；(c) 研究和比较了 SPSM 和 MPSM 对列车-轨道-桥梁系统的影响。在此基础上，从静态和动态角度提出了不同桥墩沉降模型的应用范围。结果表明，从静态角度看，SPSM 和 MPSM 具有相似性，MPSM得到的结果是SPSM计算结果的叠加。由于模型规模较大，MPSM 的计算效率低于 SPSM。建议SPSM研究耦合系统的静态性能并在动态研究中进行参数分析，而建议MPSM研究频域中的系统动力学。