考虑参数随机性的砂浆脱空长度对行车的影响

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摘要 研究目的：高速铁路无砟轨道砂浆脱空病害直接影响线路运营速度和行车性能。本文以某六跨简支梁桥-CRTSⅡ型无砟轨道系统,CRH2C、CRH3和CRH380A高速动车组为研究对象,基于ANSYS开展无砟轨道-桥梁子模型模态分析,获取整体质量、刚度和阻尼矩阵。结合HBMAT命令和PYTHON语言将整体矩阵转换为稀疏矩阵,并与节点自由度映射文件一起导入多体动力学软件中。通过轮轨接触关系最终建立考虑砂浆脱空的车轨桥耦合系统动力学模型,并进行验证。以中国轨道谱为初始不平顺,基于前期开发的桥轨通用表征模型求得桥墩沉降引起的轨道变形为附加不平顺。考虑扣件刚度、砂浆弹性模量和桥墩沉降的随机性,基于Design-Expert软件,采用Box-Behnken法设计试验点,分别开展耦合动力学模型计算,评估不同类型高铁列车在不同砂浆脱空工况和力学参数随机性下的走行性能。
研究结论：（1）建立的考虑砂浆脱空的车轨桥耦合动力学模型与文献模型计算结果吻合良好;（2）同一砂浆脱空值下,对安全性指标强弱影响依次为CRH380A>CRH2C>CRH3,对舒适性指标影响强弱依次为CRH2C>CRH3>CRH380A,对平稳指标性影响,三种型号的列车基本一致;（3）考虑参数随机性后,安全性、舒适性及平稳性指标值均呈现上下波动情况,各指标控制限值呈上、下界值,取上界值作为控制限值较不考虑参数随机更安全可靠;（4）本研究结果可为高铁简支梁桥上行车设计及验算提供一定参考。

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	冯玉林
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	周旺保

关键词 ：简支梁桥, 高速动车组, 桥墩沉降, 砂浆脱空, 行车性能

Abstract：Research purposes: The mortar void disease of ballastless track directly affects the operating speed and running performance of high-speed railway line. Taking a six-span simply supported girder bridge-CRTS Ⅱ type ballastless track system and the CRH2C, CRH3 and CRH380A high-speed EMUs as the research object, the modal analysis of the ballastless track-bridge submodel is carried out based on ANSYS to obtain the overall mass, stiffness and damping matrix. Combined with HBMAT command and PYTHON language, the overall matrix is transformed into sparse matrix and imported into multi-body dynamics software together with node degree of freedom mapping file. Based on wheel-rail contact relationship, a dynamic model of track-bridge coupling system considering mortar void is finally established and verified. With the Chinese track spectrum as the initial irregularity, the track deformation caused by pier settlement based on the general representation model of bridge-rail developed by the author is the additional irregularity. Considering the randomness of fastener stiffness, mortar elastic modulus and pier settlement, the Box-Behnken method was used to design the test points based on Design-Expert software, coupled dynamics model calculation is carried out respectively to evaluate the running performance of CRH2C, CRH3 and CRH380A under different mortar void conditions and mechanical parameter randomness.
Research conclusions: (1) The established dynamics model of train-track-simply-supported beam bridge coupling system is in good agreement with the calculation results of the literature model. (2) Under the same mortar void condition, the influence on the safety index is CRH380A>CRH2C>CRH380A, and the influence on the comfort index is CRH2C>CRH3>CRH380A, the influence on the stability index of the three types of trains is basically the same. (3) After considering the randomness of parameters, the index values of safety, comfort and stability indexes are all fluctuate up and down, and the control limits of each index are upper and lower limits boundary values. Taking the upper limit boundary value as the control limit is safer and more reliable than not considering parameter randomness. (4) The research results can provide some reference for the design and checking calculation of high-speed railway simply supported girder bridge.

Key words： simply supported beam bridge high-speed bullet trains pier settlement mortar stripping running performance

收稿日期: 2023-02-17

PACS:

U213.2

基金资助:国家自然科学基金(52268074, 52478517); 国铁集团科技研究开发计划重点课题（N2023G040）; 江西省自然科学基金 (20232BAB204081); 湖南省自然科学基金（2023JJ40724）; 轨道交通基础设施性能监测与保障国家重点实验室开放课题（HJGZ2022106）

作者简介: ** 冯玉林,1990年出生,男,副教授。

引用本文:

冯玉林, 谢宇航, 文胜, 蒋丽忠, 楚金辉, 周旺保. 考虑参数随机性的砂浆脱空长度对行车的影响[J]. 铁道工程学报, 2024, 41(11): 17-23.
FENG Yulin, XIE Yuhang, WEN Sheng, JIANG Lizhong, CHU Jinhui, ZHOU Wangbao. Influence of Mortar Void Length Considering Random Mechanical Parameters on Running Performance. Journal of Railway Engineering Society, 2024, 41(11): 17-23.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2024/V41/I11/17

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