Hainan Steel tells you: steel design provisions for modification

3.3.1 When calculated in steel deformation, do not consider the cross section bolts (or rivets) hole caused by weakened.
3.3.2 Article deflection of flexural members should not exceed the allowable values ​​in Table 3.3.2 listed.
Vertex horizontal displacement ratio to the total height of the multi-frame structure 3.3.3 under wind loads of not more than 1/500, the ratio of the relative displacement between the layer and the story should not be greater than 1/400.
Note: The request for interior decoration higher civil multilayer frame structure, the ratio of the relative displacement between the layers of the story should be appropriately reduced. No partition of multilayer frame structure, the relative displacement between layers unrestricted.
3.3.4 which features heavy duty crane factory level, the cross between each side of the crane structure crane truss girder or braking, the deflection by a maximum lateral horizontal crane loads generated by braking structure should not exceed span 1/2200.
Article 3.3.5 has a heavy duty crane factory level columns and features, the heavy duty crane class outdoor trestle column, top elevation at the crane or crane truss girder, by a maximum horizontal load of the crane deformations resulting value should not exceed the allowable values ​​in Table 3.3.5 listed. Hainan Steel