According to different shapes, the grid structure can be divided into two-layer plate-type grid structure, single-layer and double-layer shell-type grid structure. The plate type net frame and the double-shell type net frame are divided into an upper chord, a lower chord and a web, which are mainly subjected to tension and pressure; the single-layer shell type frame member is subjected to tension and pressure, and is also subjected to tension and pressure. Bending moment and shear force. At present, most of China's grid structure adopts a plate type grid structure.
The plate type grid structure is mainly divided into three categories according to the composition form: the first type is composed of a plane truss system, which has a two-way orthogonal positive grid, a two-way orthogonal oblique grid, and a two-way oblique oblique grid. And three-way grid four forms; the second category consists of four-corner cone unit, grid structure, with four-corner cone grid, positive-draining quadrangular cone grid, oblique quadrangular cone grid, checker-shaped quadrangular pyramid There are five forms of grid and star quadrilateral cones; the third category consists of triangular pyramidal units, with triangular cone mesh, evacuated triangular cone mesh and honeycomb triangular pyramid mesh. The shell type grid structure is mainly divided into a cylindrical shell type grid frame, a spherical shell type grid frame and a hyperbolic parabolic shell type grid frame according to the shell surface form. The grid structure is divided into a steel grid, a reinforced concrete grid and a combined grid of steel and reinforced concrete according to the materials used, of which steel grids are used more.
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