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温度变化及混凝土收缩徐变长期作用会对高墩连续刚构桥主梁和桥墩的变形及内力产生影响,对于高墩多跨连续刚构桥,合理的合龙方案能优化桥梁在施工阶段和使用阶段的变形,保证高墩的稳定性。结合某特大桥工程实例,开展多跨高墩连续刚构桥合龙方案及合龙段顶推力的研究,运用有限元软件建模计算出各种合龙方案的理论顶推量,推导出各合龙方案的顶推力,并针对各种合龙方案进行变形和内力的对比分析,确定出最佳的合龙方案。
Long-term effects of temperature variation and concrete shrinkage and creep will affect the deformation and internal forces of the main girder and pier of high rigid continuous rigid frame bridge. For the high pier and multi span continuous rigid frame bridge, a reasonable bridging scheme can optimize the bridge construction and use Stages of deformation, to ensure the stability of high pier. Combined with the engineering example of a super large bridge, the research on the cross-pier project of multi-span high piers continuous rigid frame bridge and the thrust of the closing section are carried out. The theoretical pushing amount of various closing schemes is calculated by finite element software modeling, Thrust, and a variety of closure programs for deformation and internal force of the comparative analysis to determine the best closure program.