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重庆曾家岩嘉陵江公轨两用大桥为主跨270m的刚性悬索加劲连续钢桁梁桥,其跨径位列中国同类桥梁首位;主梁采用两片主桁设计,横向间距达26.4m,在同类桥梁中也尚属首次使用,鉴于桥面系纵横向受力较大且较为复杂,有必要对其受力体系进行研究。通过数值计算和经济分析,确定了曾家岩大桥上下层桥面分别采用梁格受力体系和板桁组合体系,其构造设计可供类似结构借鉴。
Chongqing Zijiayan Jialing River Rail-to-Girder Bridge is a rigid suspension stiffening continuous steel truss girder bridge with main span of 270m. Its span diameter ranks the first of its kind in China. The main girder adopts two main girders designed with horizontal spacing of 26.4m. It is also the first time that a bridge is used. In view of the fact that the bridge deck is subject to large and complicated longitudinal and transverse loads, it is necessary to study its stress system. Through numerical calculation and economic analysis, it is confirmed that the deck girders of deck girders of Zengjiayan Bridge are combined with girder force plate system and slab girder combination system, respectively.