大跨度多跨连续梁桥悬臂施工合龙顺序的优化

以湘江特大桥的预选合龙方案为依据,通过MIDAS有限元模拟该桥的3种预选合龙方案的施工过程,从最终合龙后的恒载内力分布情况、张拉预应力筋所产生的次内力、徐变次内力、纵向位移等方面对合龙方案进行了初步对比分析,并提出判定合龙方案优劣的几点建议。

Discussion on the Optimization of the Closure Sequence in Cantilever Construction of Large Multi-span Continuous Beam Bridge

Based on pre-selected closure scheme of Xiangjiang Super Bridge, this paper simulates the construction processes of three pre-selected closure schemes of this bridge by using MIDAS finite elements, makes comparative analysis on these closure schemes from the internal force distribution under constant load, secondary internal forces produced by prestressed tendon in tension, creep second-secondary internal force, and longitudinal displacement, etc., and puts forward some suggestions on judging that the closure scheme is good or not.