楼板变形对地下大空间外墙结构设计的影响分析

在地下空间结构中,外墙设计是否合理直接影响工程造价及结构安全.在构建整体模型中,通常假定地下大空间楼板为平面内无限刚.但对于楼板存在边跨开洞、不连续、板墙刚度比较小等情况,外墙与楼板连接处仍采用铰接则不符合板墙实际受力.在实际工程中,当楼板平面内刚度相比外墙抗弯度较小时,深埋地下结构外墙的跨中弯曲变形及支撑薄板平面内变...

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

In the underground space structure, the rationality of the external wall design will directly affect the project 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, large stiffness ratio of wall and slab, will lead to the calculation of the articulated boundary of plate and wall which does not conform to the static analysis results. If the in-plane stiffness of floor slab is smaller than that of the external wall in practical engineering, the mid span bending deformation of the external wall and the in-plane deformation of plates are larger, and the internal force redistribution of the external wall is obvious. Therefore, when the model is calculated, the boundary condition of the external wall is actually a spring support with stiffness variation. In the design, corresponding reinforcement measures should be adopted according to the results of finite element calculation. Based on Rizhao comprehensive passenger station construction project, the external wall is calculated by finite element method. The optimization design of exterior wall structure for deep buried large space structure is put forward.