基于运营安全性能评价的城市轨道交通大跨度梁式桥变形控制标准研究*
李国龙高芒芒杨静静赵文博尤明熙张煜
Deformation Control Standards of Urban Rail Transit Long-span Beam Bridge Based on Operation Safety Performance Evaluation
LI GuolongGAO MangmangYANG JingjingZHAO WenboYOU MingxiZHANG Yu
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作者信息:中国铁道科学研究院集团有限公司基础设施检测研究所,100081,北京
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Affiliation:Infrastructure Inspection Research Institute, China Academy of Railway Sciences Corporation Limited, 100081, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2020.11.011
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中图分类号/CLCN:TU446；U448.21
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栏目/Col:研究报告
摘要:
借鉴圆曲线离心加速度的理念，参考轨道动态质量容许偏差管理限值，以典型的刚构桥和连续梁桥为实际案例，针对大跨度梁式桥进行车-线-桥动力响应分析。首先，分析无初始变形条件下的车辆动力响应，进而确定其与管理标准中车体加速度的差值，以此初步确定桥梁的允许变形限值；然后，综合考虑多种荷载工况和轨道随机不平顺，进行车-桥动力响应分析，以验证和修正最终结论。对于大跨度梁式桥，研究结果表明：满足竖向变形要求的总挠跨比行车安全限值取1/750，预警值取1/1 050；满足横向变形要求的总挠跨比安全限值取1/1 500，预警值取1/2 500；梁端折角的安全限值取5‰，预警值取3.5‰；梁体扭转竖向变形差的安全限值取10 mm，预警值取8 mm。
Abstracts:
Drawing on the concept of circular curve centrifugal acceleration and referring to the track dynamic quality tolerance management limits, taking the rigid frame bridge and the continuous beam bridge as the practical cases, vehicle-track-bridge coupling dynamic analysis is conducted. Firstly, the vehicle dynamic response under no initial deformation condition is analyzed, the difference between which and the car body acceleration in the management standard is found, and the allowable deformation limit of the bridge is primarily determined. Then, considering various load conditions and track geometry irregularity, the vehicle-bridge dynamic response analysis is carried out in order to verify and correct the final conclusion. For long-span beam bridge, research results show that: to satisfy the vertical deformation requirement, the driving safety limit of the total torsion span ratio is 1/750, the warning limit is 1/1 050; to satisfy lateral deformation requirement, the safety limit of total torsion span ratio is 1/1 500, and the warning limit is 1/2 500. The safety limit of rotation angle at bridge end is 5%, and the warning limit is 3.5%; the safety limit of beam torsion vertical deformation difference is 10 mm, and the warning limit is 8 mm.
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