楼板变形对地下大空间外墙结构设计的影响分析
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作者单位:

[1.上海市政工程设计研究总院(集团)有限公司, 上海市 200092;

作者简介:

柏炯(1973—), 男, 硕士, 高级工程师, 从事城市交通与地下空间设计工作。

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中图分类号:

TU354

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Analysis on Impact of Floor Deformation on Design of External Wall in Large Underground Space Structure
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    摘要:

    针对地基变形特征及其引发的大型污水处理池混凝土结构破裂渗漏风险,研究人工降水、开挖与桩基加固、滨海潮汐地下水渗透等条件下的地基变形特性,并建立地基变形基本方程及多因素综合影响下的统一函数表达式。结合上海白龙港污水处理厂工程,分析工程区域施工及环境因素可能产生的地基变形及其对结构受力的不良影响。结果表明:(1)地基变形曲率对结构受力产生直接影响,曲率半径越小,结构的附加应力越大、致裂风险越高;(2)结构高度越大,对地基弯曲变形的反应越敏感;(3)结构抗弯刚度突变处,应力集中程度高、局部应力超限风险增大。

    Abstract:

    In the underground space structure, the rationality of the external wall design will directly affect the engineering cost and structural safety. In building the overall model, it is usually assumed that the large underground space slab is infinite rigid in the plane. But for these situations, such as floor slab with side span opening, discontinuities slab, smaller stiffness ratio of wall and slab, the articulation still used at the connection of external wall and floor slab does not conform to the practical stress of slab wall. If the in-plane stiffness of floor slab is smaller than the bending resistance of the external wall in practical engineering, the mid span bending deformation of the external wall in the underground structure and the in-plane deformation of support plates are larger, which will lead to the internal force redistribution of the external wall. In case not considering, the larger calculation error will be caused. Therefore, when the plate wall is calculated and analyzed, the boundary condition of the external wall is actually a spring support with stiffness variation. In the design, the corresponding reinforcement measures should be taken according to the results of finite element calculation. Based on the underground space construction project in the north square of Rizhao Integrated Passenger Station, the finite element calculation is carried out for its external wall. The optimization design scheme of exterior wall structure for deep buried large space structure is put forward.

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历史
  • 收稿日期:2021-06-01
  • 最后修改日期:2021-07-04
  • 录用日期:2021-07-08
  • 在线发布日期: 2022-03-07
  • 出版日期: 2021-03-15
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