活动支座摩擦阻力对地铁连续梁桥上无缝线路的影响
徐浩1谢铠泽2陈嘉胤1
Influence of Movable Bearing Friction Resistance on CWR of Subway Continuous Beam Bridge
XU Hao1XIE Kaize2CHEN Jiayin1
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作者信息:1.广州航海学院智能交通与工程学院， 510725， 广州
2.石家庄铁道大学安全工程与应急管理学院， 050043， 石家庄
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Affiliation:1.School of Intelligent Transportation and Engineering, Guangzhou Maritime University, 510725, Guangzhou, China
2.School of Safety Engineering and Emergency Management, Shijiazhuang Tiedao University, 050043, Shijiazhuang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.04.036
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中图分类号/CLCN:U213.9+12
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栏目/Col:研究报告
摘要:
［目的］采用连续梁时地铁桥梁的活动支座处存在摩擦阻力，会影响桥上无缝线路的受力与变形，因此有必要研究活动支座摩擦阻力对桥上无缝线路的影响。［方法］以地铁常用的大跨度三跨连续梁(跨度分别为40 m、64 m 、40 m)为例，基于梁-轨相互作用原理及有限元理论，采用ANSYS 12.0有限元软件建立考虑活动支座摩擦阻力的钢轨-桥梁-墩台一体化空间耦合模型，分析活动支座摩擦阻力对桥上无缝线路受力及变形的影响。［结果及结论］活动支座摩擦阻力增强了连续梁与无缝线路的纵向约束，对连续梁桥上无缝线路受力和变形影响显著。随着活动支座摩擦因数的增大，钢轨伸缩力、钢轨制动力、梁轨相对位移和钢轨断缝值均减小；当活动支座摩擦因数从0增大至0.05时，伸缩工况下钢轨伸缩力减小了37.18%，连续梁固定支座处桥墩纵向力增大了2.02倍；制动工况下钢轨制动力、梁轨相对位移和连续梁固定支座处桥墩受力分别减小了13.74%、17.65%和37.73%；断轨工况下钢轨断缝值和桥墩受力分别减小了9.01%和56.90%；建议在地铁连续梁桥上无缝线路及桥墩设计中应考虑活动支座摩擦阻力的影响。
Abstracts:
［Objective］ When continuous beams are employed in subway bridges, frictional resistance exists at the movable bearings, which may affect the force and deformation of the continuous welded rail (CWR) on the bridge. Therefore, it is necessary to study the effect of movable bearing frictional resistance (MBFR) on bridge CWR. ［Method］ Taken the commonly used large-span three-span continuous beam bridge in subway (spans of 40 m, 64 m, 40 m respectively) as an example, based on the track-bridge interaction principle and finite element theory, the rail-bridge-pier integrated spatial coupling model considering MBFR is established using ANSYS12.0 finite element software. The influence of MBFR on the force and deformation of CWR on the bridge is analyzed. ［Result & Conclusion］ MBFR enhances the longitudinal constraints between the continuous beam bridge and CWR, showing a significant impact on the force and deformation of CWR on the bridge. With the increase of the movable bearing frictional factor (MBFF), the rail expansion force, the rail braking force, the track-bridge relative displacement, and the rail broken gap value all decrease; when MBFF increases from 0 to 0.05, the rail expansion force decreases by 37.18% and the pier longitudinal force at the fixed bearing of continuous beam bridge increases by 2.02 times under expansion condition; under the braking condition, the rail braking force, the track-bridge relative displacement and the pier longitudinal force at the fixed bearing of the continuous beam bridge decrease by 13.74%, 17.65% and 37.73% respectively; under the condition of rail broken, the rail broken gap value and the pier force decrease by 9.01% and 56.90% respectively. It is recommended that the influence of MBFR should be considered in the design of CWR and piers on subway continuous beam bridges.
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