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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第11期    总第80期    2016年11月

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文章编号:1672-7029(2016)11-2174-07
考虑轨道约束的重载铁路大跨度连续刚构桥地震响应
涂鹏1,周文涛1,闫斌1,2

(1.中南大学 土木工程学院,湖南 长沙 410075;2.高速铁路建造技术国家工程实验室,湖南 长沙 410075)

摘 要: 为研究大跨度重载铁路连续刚构桥与轨道系统地震响应规律,建立考虑轨道约束的重载铁路大跨度连续刚构桥与轨道系统一体化仿真模型。以某6-32 m简支梁+(108+180+108) m重载铁路连续刚构桥+6-32 m简支梁为例,分析轨道约束和相邻桥跨对自振特性的影响,研究一致激励下梁轨系统地震响应,探讨路基段长度、线路纵向阻力和地形对系统地震响应的影响,研究地震与温度的耦合作用机理。研究表明:轨道约束和相邻桥跨会使自振频率增大;系统地震响应与地震频谱特性有关;考虑相邻桥跨后,钢轨最大地震应力、墩顶水平力最大值和墩顶水平位移均有所增大;随着路基段长度的增大,钢轨地震应力最大值增大,墩底水平力最大值和墩顶水平位移减小,路基段长度建议至少取100 m;铺设无砟轨道时的钢轨地震应力最大值大于有砟轨道和小阻力扣件,其墩顶水平力和墩顶水平位移三者最小。随着桥墩高度的增大,墩顶水平力增大;地震与温度荷载耦合作用时的钢轨应力不等于两者单独作用时结果的线性叠加。

 

关键字: 重载铁路;轨道约束;相邻桥跨;连续刚构桥;梁轨相互作用;地震响应

Seismic response of large span continuous rigid frame bridges under heavy haul railway considering track restraint
TU Peng1, ZHOU Wentao1, YAN Bin1,2

1.School of Civil Engineering,Central South University, Changsha 410075, China; 2.National Engineering Laboratory for Construction of High Speed Railway,Changsha 410075, China

Abstract:For the study of seismic response law of long span continuous rigid frame bridge and track system in the heavy haul railway, a simulation model for continuous rigid frame bridge and track system considering track restraint under heavy haul railway was established. Taking a 6-32m simply supported beam+(108+180+108) m heavy haul railway continuous rigid-frame bridge +6-32m simply supported beam as an example, the influence of the track constraints and the adjacent bridge span on the self-vibration characteristics was analyzed, and seismic response of the system was studied. The influence of the length of the subgrade, the longitudinal resistance and the topography on the seismic response of the system were also studied. The research shows that track restraint and the adjacent bridge increase the frequency of the system; the seismic response of the system is related to the spectrum characteristics of earthquake; after considering the adjacent bridge, the maximum rail stress, the maximum horizontal force loaded on top and horizontal displacement of pier top increases; with the increase of the length of the subgrade, the maximum value of the stress of the rail increases, and the maximum of the pier horizontal force and horizontal displacement of pier top decreases, and the length of the subgrade should be at least 100m;when the rail laying ballastless track the maximum stress value is greater than the laying of ballasted track and small resistance fastener, the horizontal force of pier top and horizontal displacement of pier top is the minimum of the three cases; with the increase of pier height, the horizontal force of pier top increases; the rail stress of coupling effect of earthquake and temperature loads is not equal to the sum of the two separate effects.

 

Key words: heavy haul railway; track restraint ; adjacent bridge span; continuous rigid-frame bridge; track-bridge interaction; earthquake response

ISSN 1672-7029
CN 43-1423/U

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