铁路箱梁装配式桥面系防撞性能试验研究

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摘要 研究目的: 为推动装配式结构在铁路桥梁中的应用,本文针对列车脱轨荷载作用下客货共线铁路箱梁装配式桥面系开展试验研究。为掌握新型装配式桥面系的防撞性能,设计和制备预制装配式桥面系挡砟墙和现浇挡砟墙足尺试验模型,对足尺模型开展静载试验,对比研究客货共线铁路箱梁预制装配式桥面系挡砟墙防撞性能。
研究结论: (1)装配式桥面系挡砟墙在脱轨设计荷载多次循环作用下结构基本处于弹性状态,满足设计要求;(2)极限状态下,挡砟墙出现斜向主裂缝并破坏,极限承载能力达到脱轨设计荷载的1.44倍,具有一定安全余量,相比于现浇挡砟墙结构具有更高的承载能力;(3)列车脱轨荷载极限状态下桥面系预制件与桥面翼缘板之间采用螺栓连接的方式安全可靠,满足防撞设计要求;(4)脱轨设计荷载作用下,线路侧部分砂浆层退出工作,结构裂缝主要集中于线路侧底板底面和挡砟墙线路侧墙面,挡砟墙上裂缝呈水平向分布;(5)试验现象和结果验证了设计方法和假定条件的正确性,并得出应对挡砟墙进行抗剪极限承载力验算的结论;(6)本研究成果可为高速铁路、客货共线铁路箱梁预制装配式桥面系的防撞设计和结构优化提供借鉴。

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	李旺旺
	尹京
	苏永华
	班新林
	王苇
	陈胜利

关键词 ：装配式桥面系, 铁路箱梁, 足尺模型试验, 挡砟墙, 极限承载力

Abstract：Research purposes: In order to promote the application of prefabricated structure in railway bridges, this paper conducts experimental research on the prefabricated bridge deck system of passenger-freight railway box girder under train derailment load. In order to investigate the anti-collision performance of the new type of prefabricated bridge deck system, the full-scale test models of prefabricated bridge deck system and cast-in-place ballast wall were designed and fabricated, the static load test was carried out on the full-scale model, and the anti-collision performance of prefabricated bridge deck system of passenger-freight railway box girder was compared and studied.
Research conclusions: (1) The ballast wall of prefabricated bridge deck system is basically in elastic state under the action of multiple cycles of derailment design load, which meets the design requirements. (2) Under the ultimate state, the main diagonal cracks appear in the ballast wall and damage. The ultimate bearing capacity reaches 1.44 times of the derailment design load, and has a certain safety margin. Compared with the cast-in-situ ballast wall, it has higher bearing capacity. (3) The bolt connection between the prefabricated bridge deck system and the bridge deck flange plate is safe and reliable under the ultimate state of train derailment load, which meets the requirements of anti-collision design. (4) Under the derailment design load, part of the mortar layer on the line side is deactivated, and the structural cracks are mainly concentrated in the bottom of the line side floor and the ballast wall of the line side, and the cracks on the ballast wall are distributed horizontally. (5) The test phenomena and results verify the correctness of the design method and assumptions, and draw the conclusion that the shear ultimate bearing capacity of the retaining wall should be checked. (6) The research results can provide reference for anti-collision design and structural optimization of prefabricated bridge deck system of box girder in high-speed railway and passenger-freight railway.

Key words： prefabricated bridge deck system railway box girder full-scale model test ballast retaining wall ultimate bearing capacity

收稿日期: 2021-03-25

PACS:

U443.5

基金资助:中国国家铁路集团有限公司科技研究开发计划课题(K2019G005);中国铁道科学研究院基金项目(2021YJ074)

作者简介: ^**李旺旺,1988年出生,男,副研究员。

引用本文:

李旺旺, 尹京, 苏永华, 班新林, 王苇, 陈胜利. 铁路箱梁装配式桥面系防撞性能试验研究[J]. 铁道工程学报, 2022, 39(3): 62-68.
LI Wangwang, YIN Jing, SU Yonghua, BAN Xinlin, WANG Wei, CHEN Shengli. Experimental Research on the Anti-collision Performance of Fabricated Bridge Deck System for Railway Box Girder. Journal of Railway Engineering Society, 2022, 39(3): 62-68.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I3/62

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