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 quadrangular pyramid units.
The structure of the grid structure is composed of four square pyramid net racks, a positive-discharged four-corner cone net frame, an oblique quadrangular pyramid net frame, a checkerboard quadrangular pyramid net frame and a star quadrangular pyramid net frame; the third type consists of triangles. The cone unit is composed of a triangular cone mesh frame, an evacuated triangular cone mesh frame and a honeycomb triangular pyramid mesh frame. 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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