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为保证高墩六跨连续刚构桥顺利合龙,结合城川河大桥工程实例,运用Midas/Civil软件建立了该桥的有限元模型,模拟其施工过程。按照先中跨、后边跨、再次中跨的合龙顺序,考虑混凝土长期收缩徐变作用及合龙温差对主梁与桥墩的变形与受力的不利影响,分别提出不施加顶推力、在次中跨跨中施加顶推力、在中跨和次中跨跨中施加顶推力3种顶推方案。并对顶推位移量、顶推力的大小进行了计算分析,将3种顶推方案在成桥状态下对结构内力的影响进行对比分析。计算结果表明,施加顶推力方案与不施加顶推力方案相比,能明显改善墩底受力,同时对跨中下挠有一定改善作用。经综合比较,方案2与方案3的计算结果基本一致,但方案2施加4对顶推力,施工复杂且工作量较大,故选择方案3为施工合龙方案。
In order to ensure the successful closure of the six-span continuous rigid frame bridge with high piers, the finite element model of the bridge was constructed by using Midas / Civil software and the construction process was simulated. Considering the long-term shrinkage and creep of concrete and the influence of temperature difference on the deformation and stress of the main girder and bridge piers, respectively, according to the order of the first midspan, the second midspan and the second mid-span, Thrust is applied across the middle and three push solutions are applied to the midspan and mid-span. The displacement of thrusting and the magnitude of pushing force are calculated and analyzed. The impact of three kinds of thrusting schemes on the internal force of structure is compared and analyzed under the condition of bridge. The calculation results show that compared with the scheme of not applying thrust force, the jacking thrust scheme can obviously improve the pier bottom stress and improve the mid-span deflection at the same time. After a comprehensive comparison, the calculation results of Scheme 2 and Scheme 3 are basically the same, but 4 pairs of jacking thrust are applied in Scheme 2, the construction is complicated and the workload is heavy, so that the alternative 3 is the construction and closing scheme.