According to the use and process requirements to determine the general 3M as a module.The roof span is 3 times, 12 m, 15 m, 18 m, 21m, 24 m, 27 m, 30 m, 36 m,also have a greater span.Triangular steel purlin roof structure is flexible, not limit by 3M modulus.
Steel truss span calculation: the roof supports distance force, generally take the distance between the axis of pillar minus 300 mm.
Roof height: according to the requirements of economic, stiffness, construction and transportation lines, roof slope and other factors to determine.Triangle truss height h= (1 / 4 ~ L / 6) L (span), in order to adapt to the requirements of materials with large roof roof slope.
Trapezoid truss relatively flat slope, the roof span height should meet the demand of stiffness, when the winding slope is 1 / 8 to 1 / 12, span height is generally (L / 6 ~ 1 / 10 L). The small value is taken when the span is large (or the roof load is small),otherwise large value.
End height: when the roof is hinged with the column is 1.6 ~ 2.2 m, when the rigid connection is 1.8 ~ 2.4 m; the large value is taken when the bending moment is large, otherwise small.
Height: according to the end height, roof slope, the maximum height should be less than the transport boundaries, such as railway transportation line is 3.85M.
Division of roof steel truss internodes should be determined according to the roofing material. When using a large house, the roof panel width is equal to the length of internodes, generally 1.5 m or 3 m; When using the purlin, according to the purlin spacing set, generally 0.8 ~ 3 m. Try to make the load of the roof effect directly on steel roof truss joints, avoid the top chord of local moment.
This blog is published by the steel roof truss manufacturer Jiangsu Andy Steel Structure Co. Ltd.
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