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steel design provisions for modification

Guangzhou Steel tells you: steel design provisions for modification

3.3.1 Accounting steel deformation when, from time to consider cross-section bolts (or rivets) hole caused by weakened.
3.3.2 Article deflection flexural members shall not exceed the allowable values ​​listed in Table 3.3.2.
The ratio 3.3.3 Frame Structures under wind loads pole horizontal displacement and total height 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: For interior decoration demanding 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 Accounting deformation resulting value should not exceed the allowable values ​​listed in Table 3.3.5. Guangzhou Steel