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以充气膜为模板的钢筋混凝土扁壳结构在国内极少运用,设计和施工没有专用规范可循.对某气膜钢筋混凝土扁壳结构的设计进行了详细的介绍和分析,结合气膜钢筋混凝土结构施工工艺,讨论了结构在荷载作用下的变形和内力、温度作用的影响、支座约束对结构的影响、基础环梁对扁壳结构的作用、形态偏差对结构受力性能的影响、扁壳结构的配筋及基础设计.分析表明:壳体结构中间区域以薄膜内力为主,在基础边缘位置轴力和弯矩都较大;支座节点刚度的增大能有效减小结构的变形和内力;温度作用对结构内力和变形影响很大,升降温引起结构挠度变化幅度达到-37.5%~43.75%;环梁对壳体边缘的约束作用能减小结构的变形,对边缘壳体产生较大的附加内力;结构位移和内力随形态偏差的增大而增大;扁壳结构的配筋采用双层双向钢筋,采用混凝土矩形截面偏心拉压公式在同一高度分层计算;气膜混凝土扁壳结构的基础设计需考虑施工荷载和工艺的特殊性.
The use of inflatable membrane as a template of reinforced concrete flat shell structure rarely used in the country, design and construction there is no specific code to follow.A membrane-reinforced concrete structure design of a detailed description and analysis, combined with the film reinforced concrete Structure and construction technology, the deformation and internal forces under the action of load, the effect of temperature, the influence of the support constraint on the structure, the effect of the basic ring beam on the flat shell structure and the influence of the shape deviation on the mechanical behavior of the structure are discussed. The reinforcement and basic design of the shell structure are analyzed.The results show that the internal force of the shell is dominated by the membrane internal force and the axial force and bending moment are large at the base edge position.The increase of the stiffness of the bearing node can effectively reduce the deformation of the structure And internal force. The effect of temperature on the internal forces and deformation of the structure is very great, and the variation range of the structural deflection caused by the temperature rise and fall reaches -37.5% ~ 43.75%. The constraint effect of the ring beam on the edge of the shell can reduce the deformation of the structure, Large additional internal forces; structural displacement and internal force increases with the increase of the form deviation; the reinforcement of the flat shell structure adopts double-layer bi-directional reinforced concrete, Layered calculation at the same height; the basic design of the film-concrete shell structure needs to consider the construction load and the particularity of the process.