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在悬索桥上部结构施工过程中,索塔容许偏位的正确计算以及主索鞍顶推阶段和顶推量的合理确定,事关索塔的受力安全。以四渡河悬索桥为工程背景,分别按索塔截面不出现拉应力和拉应力不超限两种强度条件分析了索塔的容许偏位,且系统地分析了各施工阶段考虑P-Δ效应对索塔容许偏位和不平衡水平力的影响,并提出了主索鞍顶推阶段和顶推量的确定方法,得出了若干结论,对悬索桥的施工控制有直接参考价值。
During the construction of the superstructure of the suspension bridge, the correct calculation of the allowable deviation of the pylon and the reasonable determination of the pushing stage and the pushing amount of the main saddle are relevant to the safety of the pylon. Taking the Siduhe Suspension Bridge as the engineering background, the allowable misalignment of the pylon was analyzed according to the two kinds of strength conditions that the tensile stress and tensile stress of the pylon did not appear to exceed the limit, and the P-Δ effect was considered systematically in each construction stage The allowable deviation of tower and unbalanced horizontal force, and puts forward the determination method of the main saddle pushing stage and pushing amount, and draws a number of conclusions, which have direct reference value to the construction control of the suspension bridge.