车辆荷载作用下曲线桥桥墩静力性能研究

Study on Static Performance of Curved Bridge Piers under Vehicle Loads

摘要:

曲线匝道桥作为高架桥的一部分，经受着巨大车流量的考验，其桥墩静力性能在车辆荷载长期作用下会不断变化，最不利位置可能会发生破坏。结合三明南站站前高架进口匝道桥，通过理论分析，研究了不同纵向坡度和行车位置对曲线匝道桥桥墩静力性能的影响。结果表明：主梁纵向坡度越大，随着车速增大，桥墩应力增大较快，在设计过程中应合理控制主梁坡度；随着车速的增大，桥墩变形值变化极小，可以忽略，车速不变时，汽车于内车道行驶的桥墩应力值和变形值最小，运营时应指示车辆靠内行驶。

Abstract:

As a part of the elevated bridge, the curved ramp bridge is subjected to the test of huge traffic flow. The static performance of its piers will constantly change under long-term vehicle loads, and the most unfavorable position may be damaged. Combined with the elevated entrance ramp bridge in front of Sanming South Station, and through the theoretical analysis, the influence of different longitudinal slopes and driving positions on the static performance of curved ramp bridge piers is studied. The results show that the greater the longitudinal slope of the girder, the faster the pier stress increases with the increase of vehicle speed. In the design process, the slope of the girder should be controlled reasonably. With the increase of vehicle speed, the deformation value of pier changes very little and can be ignored. When the vehicle speed remains constant, the stress value and deformation value of the pier where the vehicle runs in the inner lane are the smallest, and the vehicle should be instructed to run in the inner lane during operation.