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文[1],[2]、[3]提出的交叉梁系力法及荷载分配法均是以力法原理为基础,是分析正放类交叉梁系平板网架各杆内力的一种较好的方法,并建立了不同边界条件的各类典型方程。它们的优点是简单易懂,计算机所需容量小,且计算精度满足工程设计要求。但是斜放类平板网架,特别是具有点支承的斜放类平板网架,文[1]、[2]、[3]的典型方程就不完全适用,而拟夹层板法也仅适用于正放类平板网架,因为斜放类的各向异性板,其微分方程十分复杂,求解困难。本文根据斜放类平板网架的力学特性,推导出在各种边界条件下的力法典型方程,并考虑腹杆剪切变形的影响,从而扩大了力法解的应用范围,为编制正交正放、正交斜放平板网架力法解的计算用表建立完整的理论基础。本文已在某体育馆的正交斜放网架屋盖中应用(44×44~M),其计算精度满足设计要求,创造了用小型微机(PC—1500)分析较大跨度平板网架杆件内力的先例。
In [1], [2] and [3], the cross-beam force method and the load distribution method are all based on the force method principle. It is a comparative analysis of the internal forces of the rods of the flat-plate grid in the cross-type cross-beam system. Good method, and established various typical equations for different boundary conditions. Their advantages are simple and easy to understand, the required capacity of the computer is small, and the calculation accuracy meets the engineering design requirements. However, the oblique type flat-plate grids, especially the oblique-type flat-type grids with point supports, the typical equations of [1], [2], and [3] are not completely applicable, and the proposed sandwich plate method is also applicable only to The type of flat-plate grid is being placed. Because of the oblique-type anisotropic plates, the differential equations are very complicated and difficult to solve. In this paper, according to the mechanical properties of the oblique plane type grid, the typical force equations under various boundary conditions are deduced, and the influence of the shear deformation of the web is considered, so that the application range of the force solution is enlarged and the orthogonality is developed. The theoretical basis for the calculation table of the force-solution solution of the normal plane and orthogonal oblique plane grid is established. This paper has been applied in the orthogonal tilting grid roof of a gymnasium (44×44~M). The calculation accuracy meets the design requirements, and the analysis of large-span flat grid bar members using a small computer (PC-1500) is created. The precedent of internal forces.