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针对山区连续刚构桥边跨现浇段施工时,地形条件不利于支架施工的特点,为减小边跨现浇段长度,提出4个不对称悬臂施工合龙方案。以某山区高墩刚构桥为例建立仿真模型,分析不同合龙方案条件下的结构变形特点,探讨山区大跨度刚构桥各个合龙方案的适应性。结果表明,4个合龙方案施工和运营阶段应力均满足规范要求;边跨线形调整值随着不对称悬浇段的增大而增大,且先合龙中跨有利于减小边跨悬臂端挠度;施工和成桥阶段最大挠度值和最大上拱值随不对称悬臂浇注长度的增大有增大的趋势;补充张拉箱梁顶板束和先合龙边跨均会导致中跨跨中位置的徐变上拱值增大;根据地形条件选择合适的不对称悬臂施工合龙方案,可有效减小边跨支架现浇段长度,为山区刚构桥设计施工提供参考。
For the construction of continuous rigid frame bridge cross-section in mountainous area, the topographical conditions are not conducive to the construction of the bracket. To reduce the length of the cast-in-situ section of the side span, four asymmetric boom construction closure schemes are proposed. Taking a high-pier rigid frame bridge in a mountainous area as an example, a simulation model is established to analyze the structural deformation characteristics under different closure schemes and to explore the suitability of various long-span rigid frame bridges in mountainous areas. The results show that the stress of construction and operation phases of four closure schemes all meet the requirements of the specification. The adjustment value of edge cross-line increases with the increase of asymmetric suspension sections. ; The maximum deflection value and the maximum upper arch value during the construction and completion phases tend to increase with the increase of asymmetric cantilever pouring length; The arch value increases on the creep; according to the topography conditions, the suitable asymmetric cantilever construction and closure scheme can effectively reduce the length of the cast-in-situ section of the side-span support, which provides a reference for the design and construction of the rigid frame bridge in the mountainous area.