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宁波甬江铁路斜拉桥在设计中采用钢箱梁方案,在铁路桥中为国内首例。铁路桥梁钢轨横向位置固定,桥面铺装也与公路桥梁不同,为研究钢箱梁正交异性板用于铁路桥梁和公路桥梁的区别,在桥面板上分别设置铁路与公路铺装,通过有限元计算,得出设置不同铺装时疲劳敏感部位应力的横向影响线、纵向影响线,研究各部位应力的产生原因,分析钢箱梁正交异性板用于铁路桥梁和公路桥梁的各自特点;选择具有代表性的铁路车辆与公路车辆对钢箱梁正交异性板进行加载,计算各种车辆作用下疲劳敏感部位的应力情况。分析及计算结果表明:公路沥青混凝土铺装对荷载的分散作用有限,铁路铺装对荷载的分散作用较强,与公路桥梁相比,铁路桥梁各疲劳敏感部位应力影响线量值较小,影响线长度较大;在常规铁路车辆作用下,正交异性板在加劲肋与横隔板连接部位及横隔板开口边缘的最不利应力与常规公路车辆作用下的量值相当;与铁路桥梁相比,公路桥梁正交异性板更易在加劲肋与顶板连接处发生疲劳开裂。
Ningbo Yongjiang Railway Cable-stayed Bridge in the design of steel box girder program, the first of its kind in the railway bridge. In order to study the difference between railway bridge and highway bridge, the bridge deck is set up with railroad and road pavement separately. Through the limited Element calculation, the transverse influence line and longitudinal influence line of stress in different sensitive parts of pavement are obtained, and the causes of stress in each part are studied. The respective characteristics of steel box girder Orthotropic Plate are analyzed for railway bridge and highway bridge. Select the representative of rail vehicles and road vehicles on the steel box girder Orthotropic plate load, calculate the various parts of the vehicle under the fatigue-sensitive parts of the stress situation. The results of analysis and calculation show that asphalt pavement paving has limited effect on load dispersion and railway pavement has a strong dispersion effect on load. Compared with highway bridges, the magnitude of stress-affected lines in each fatigue-sensitive part of railway bridges is small, Under the action of conventional railway vehicles, the most unfavorable stress of the orthotropic plate at the connection between the stiffener and the diaphragm and the edge of the diaphragm is equivalent to that of the conventional road vehicle. Compared with the railway bridge phase Than the highway bridge Orthotropic plate easier in the stiffener and roof joint fatigue cracking occurs.