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大跨度桥梁结构在施工过程中,由于桥梁结构的空间位置及形状随施工的进展将不断发生变化,要经过多次的体系转换过程,若同时考虑到施工过程中的结构自重、施工荷载以及混凝土材料的收缩、徐变、施工时间荷载等因素的影响,将可能导致桥梁合拢困难、成桥线形与设计要求不相符、设计状态难以保证等问题。因此,必须对大跨度桥梁的施工预拱度、主梁梁体内的应力等进行严格的施工控制。以某公路大桥为例,对该大跨度桥梁结构主桥施工过程中的变形和应力进行分析。
Long-span bridge structure In the process of construction, as the spatial position and shape of the bridge structure will continue to change with the progress of construction, after many times of system conversion process, taking into account the structural weight of the construction process, construction load and concrete Material shrinkage, creep, construction time load and other factors, will likely lead to bridge closure difficulties, into line with the design requirements do not match, the design state is difficult to guarantee and other issues. Therefore, it is necessary to carry out strict construction control on the construction camber of the long-span bridge, the stress in the main girder and the like. Taking a highway bridge as an example, this paper analyzes the deformation and stress during the construction of the bridge spanning the long - span bridge.