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利用弹性二维有限元分析模型 ,把广州地铁三号线明挖段初步设计阶段的整体双跨箱形结构划分为顶板、底板和边墙 5块构件 ,计算了边墙与顶板的连接接头的设置位置及其抗弯刚度变化对预制双跨箱形结构内力的影响。结果表明 :接头抗弯刚度的变化主要影响边墙最大正弯矩、顶板最大负弯矩和顶板最大正弯矩 ;而且接头的位置离顶板轴线距离越小 ,顶板最大正弯矩和边墙最大正弯矩越大 ,而顶板最大负弯矩越小 ;因为顶板最大正弯矩和边墙最大正弯矩均小于顶板最大负弯矩 ,所以接头设置在边墙适当的负弯矩处比较有利。
Based on the elastic two-dimensional finite element analysis model, the whole double-span box structure in the preliminary design stage of the Guangzhou Metro Line 3 excavation is divided into five components of roof, floor and side wall. The connection between the side wall and the roof is calculated Effect of Position and Bending Stiffness on Internal Forces of Precast Double Span Box Structures. The results show that the change of joint bending stiffness mainly affects the maximum positive bending moment of the side wall, the maximum negative bending moment of the roof and the maximum positive bending moment of the roof. The smaller the distance between the joints and the axis of the roof, the maximum positive moment and the maximum The larger the positive moment and the lower the maximum negative moment of the roof, the more favorable negative moment of the joint wall is more advantageous because the maximum positive moment of the roof and the maximum positive moment of the side wall are less than the maximum negative moment of the roof. .