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斜拉索更换施工过程中旧索的拆除和新索的重新张拉必然引起桥面线形、主梁应力和剩余斜拉索的索力等桥梁结构受力指标的变化,造成斜拉桥的内力重新分布,并对桥梁结构本身可能产生不利的影响。通过建立各种斜拉索更换方案、旧索拆除顺序的独立有限元模型,并进行施工阶段分析计算,比较各种方案下的斜拉索索力增量、桥面线形、主梁应变和主梁弯曲应变能等代表桥梁受力状态的指标,得到最优的斜拉索更换方案,为施工过程提供指导。
During the construction of the stay cable replacement, the demolition of the old cable and the re-tensioning of the new cable inevitably lead to the change of the stress index of the bridge structure, such as the linear profile of the bridge deck, the stress of the main girder and the cable force of the remaining stay cables, resulting in the internal force of the cable- Redistribute it and have a detrimental effect on the structure of the bridge itself. Through the establishment of a variety of stay cable replacement program, the old cable removal sequence of independent finite element model, and construction stage analysis and calculation, comparison of various programs under the cable stay force increment, the deck line shape, the main girder strain and the main beam Bending strain energy and other indicators of the bridge on behalf of the state of force, to be the best cable replacement program for the construction process to provide guidance.