柱支预应力局部单双层浅网壳的结构分析

Structure analysis of columm-supported prestressed partial single-layer shallow reticulated shell

阐述了柱支预应力局部单双层浅网壳的构成原理 ,即柱支浅网壳施加适当预应力能减小结构位移、降低杆端弯矩和单元剪力 ,使网壳的内力分布更趋均匀 ,并降低柱顶水平推力和基础弯矩 ;因而可合理地将壳体中以薄膜力为主、且值很小的那部分区域改成单层。这样处理可降低造价 ,并具有较好的室内视觉效果。具体工程说明了这类结构的技术经济性 ,即施加适当预应力能提高整个结构的荷载 -重量比、与对应的柱支预应力双层浅网壳相比刚度虽然有所下降 ,但小于耗钢量降低率。

The column supported prestressed partial single layer shallow reticulated shell is a new type of long span roof structure. Proper prestressing of the column supported shallow reticulated shell over part of the shell or along its edges will make the distribution of the interior shell forces more uniform, will enlarge the membrane stress area, and will reduce the horizontal reaction forces on the shell supports. The theory of equal strength shells can then be used to lay single layer in the reduced mem...