How to calculate the cost of grid structure

The bolt ball joint of grid structure is solid core, and only part of its connection with rod will be embedded and hollowed out in the case of factory production and processing. In general, the hollow cross-section of the grid is preferred, such as round steel pipe, galvanized square steel, etc. cold rolled section steel, cold drawn thick wall steel section can also be used.

The weight calculation of space truss includes two parts: the weight of members and the weight of nodes. In general, the weight of nodes accounts for 15% - 25% of the total weight of grid members. Most of the members of the grid are made of stainless steel plate, and the density of stainless steel plate is 78.5kn/m3. Generally, its weight is calculated by computer, but it can estimate the weight of the total area of the grid enterprise first. The weight of the two-layer grid can be estimated by pressing and holding formula: G0 = a * (QW * * 0.5) * L / 200, Among them, A-index is taken as 1.0 when seamless steel tube is used as member; 1.2 is taken when section steel is used; QW is the index value of flat roof load or floor load except the weight of grid structure; l-short span of grid structure.

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