Wind Girder Roof

The wind girder is arranged as a warren or pratt truss parallel to the roof plane the chords of the wind girder are the upper chords of two adjacent vertical trusses.

Wind girder roof.

Storage tanks basic training3 7 external loading3 7 1 primary wind girders3 7 1 1 open top and floating roof tanks open top and floating roof tanks shall be provided with a primary wind girder to maintain roundness when the tank is subjected to wind loads. Wind girder roof in place as the top shell is erected first gap between the tank bottom and shell 350mm allows wind to flow through the gap reducing effects of the wind load on shell. Although the primary wind girder or the roof will stabilise the tank over its full height local buckling can occur in empty tall tanks between the top of the tank and its base. Table 3 12a of the wfcm specifies sheathing based upon the design wind speed and the spacing of the roof framing for the exposure b category of wind exposure.

The roof of a fixed roof tank assists in keeping the shell rigid and wind forces are transmitted to the bottom of the tank. Product description the steel joist institute presents the webinar wind design considerations for joists and joist girders this webinar will provide a comprehensive review of wind forces on steel joist and joist girder roof systems including wind load determination wind load combinations and wind load application. To prevent this local buckling secondary wind girders are introduced at intervals in the height of the tank.