大跨度混合梁斜拉桥上无砟轨道纵向力分析

Analysis on Longitudinal Force of Ballastless Track System on Long Span Hybrid Girder Cable-stayed Bridge

以昌赣客运专线(35+40+60+300+60+40+35)m混合梁斜拉桥为例,建立了大跨度斜拉桥上无砟轨道精细化模型计算分析不同荷载作用下大跨度桥上无砟轨道纵向力。计算结果表明:在温度荷载作用下,钢轨纵向应力相对较大,最大拉应力为130.03 MPa,跨中轨道板纵向应力较小。在竖向荷载作用下,钢轨、轨道板和底座板的拉应力最大值出现在桥塔附近,压应力最大值出现在跨中附近,其中钢轨压应力最大值为15.02 MPa,底座板拉应力最大值为3.05 MPa。在列车制动作用下,钢轨、轨道板和底座板的拉应力最大值出现在跨中附近,压应力最大值出现在桥塔附近,轨道板和底座板纵向应力均较小。

Taking a(35+40 +60+300+60+40+40+35)m hybrid girder cable-stayed bridge from Nanchang to Ganzhou passenger dedicated line as an example,the refined model of ballastless track on the long span cable-stayed bridge was established to study the longitudinal force law of ballastless track on long span bridge. The calculation results show that under the action of temperature load,the longitudinal stress of the rail is relatively large,and the maximum tensile stress is 130.03 MPa,and the longitudinal stress of mid-span track plate is small. Under the action of vertical load,the maximum tensile stresses of rail,track plate and base plate appear near the bridge tower,and the maximum compressive stresses appear near the mid-span. The maximum compressive stress of rail is 15.02 MPa,and the maximum tensile stress of base plate is 3.05 MPa. Under the action of train braking,the maximum tensile stresses of rail,track plate and base plate appear near the mid-span,the maximum compressive stresses appear near the bridge tower,and the longitudinal stresses of track plate and base plate are small.