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在网壳结构下部用预应力钢索施加与外荷载作用下方向相反的力，对改善网壳结构的受力状态、提高结构承载能力、增强结构的整体刚复、节约钢材、降低造阶等有利。本文进行了预应力短程线型钢网壳计算理论的研究，给出了预应力索单元的刚度矩阵，编制了空间杆系有限元理论的预应力网壳五阶段全过程设计的静力分析程序，结合己完工的攀枝花体育馆屋盖网壳结构的工程实例．探讨了短程线型钢网壳在自重、拉索预应力和设计荷载作用下结构的内力及位移的分布规律、索力的优选、预应力损失以及支座约束变化对网壳内力和位移的影响，还对比了网壳在不同预应力张拉顺序及有无预应力时的计算结果。
In the lower part of the reticulated shell structure, the force acting in the opposite direction to the external load is exerted by the prestressed steel cable, which improves the stress state of the reticulated shell structure, improves the bearing capacity of the structure, enhances the overall rigidity of the structure, saves the steel materials, and reduces the leveling. favorable. This paper studies the calculation theory of prestressed short-range linear steel lattice shells, gives the stiffness matrix of prestressed cable elements, and compiles the static analysis program of the five-stage whole process design of the prestressed lattice shell of space rod finite element theory. 4. Combined with the completed engineering example of Panzhihua Stadium roof reticulated shell structure. The distribution law of the internal forces and displacements of the geodesic reticulated shells under self-weight, cable prestress and design load, the optimization of cable forces, the loss of prestress, and the influence of changes in bearing constraints on the internal forces and displacements of the lattice shell are discussed. The calculation results of reticulated shells with different prestressing tension sequences and with or without prestressing are also compared.