Influence of joint's position and rigidity on precast box structure's internal force
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摘要: 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。Abstract: Taking a subway project as an example, a precast double-scan box structure was divided into five parts by using elastic double-dimension finite-element-method, those five parts included top-board, bottom-board and side-wall. The position and rigidity of the joints of those five parts have a great influence on the structure's internal force. The calculation results show that the joint's rigidity can affect the max positive moment of side-wall, the max negative moment and max positive moment of top-board; the joint's position also have influence on the max positive moment and max negative moment of top-board and side-wall; the joint's position should be located on side-wall where its moment is negative.
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图 4 S=-1.0 m时结构弯矩变化规律
Figure 4. Variety regulation of the structure moment when S=-1.0 m
图 5 S=1.0 m时结构弯矩变化规律
Figure 5. Variety regulation of the structure moment when S=1.0 m
表 1 结构内力
Table 1. Internal force of structure
/kN·m η 1点弯矩 2点弯矩 3点弯矩 4点弯矩 5点弯矩 1.0 178.1 394.1 229.2 473.5 196.9 0.8 178.0 394.2 229.2 473.3 197.0 0.6 177.9 394.5 229.3 473.0 197.2 0.4 177.6 394.9 229.3 472.5 197.5 0.2 176.7 396.3 229.5 470.9 198.3 最大变化百分比 -0.8% 0.6% 0.1% -0.6% 0.7% 
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