Wind Loads Direction Parallel To Ridge Line Or Flat Roof

For transverse load case the roof pressure coefficient gcpf when negative in zone 2 or 2e shall be applied in zone 2 2e for a distance from the edge of the roof equal to 0 5 times the horizontal dimension of the building parallel to the direction of the mwfrs being designed or 2 5 he at the windward wall whichever is less.

Wind loads direction parallel to ridge line or flat roof.

For calculating the sum of the wind load on the windward and leeward walls parallel to the building ridge the average roof height hr he 2 is used. These example calculations assume transverse wind loads produce the controlling loading. External wall flat roof lean to or ridge roof. Asce 7 05 protecting manufactured homes from floods and other hazards.

Wind direction l b windward leeward side wall wind normal to 35 ft wall 2 00 0 8 0 3 0 7 wind normal to 70 ft wall 0 50 0 8 0 5 0 7 since roof is flat theta 0 the cp values are the same for parallel and normal to ridge. Face a is in the windward direction while face c is opposite to face a and is on the leeward side case 0 wind incidence angle. This option allows to choose the wind direction for roofs as specified in asce 7 16 chapter 27 fig. Face a face b face c and face d.

Wind direction h l from to cp min cp max wind normal to 35 ft wall 0 21 0 00 ft 15 00 ft 0 9 0 18. 90 degrees wind parallel to roof ridge. The remainder of zone 2 2e extending to the ridge line shall use the pressure coefficient gcpf for zone 3 3e. Wind in the direction parallel to the roof ridge may produce greater loads for certain cases and must be evaluated during final design.

Minimum wind load for mwfrs design shall be 10 psf applied on projected vertical plane. For flat roofs roof angle 0 degrees either gable or monoslope may be used. Set the type of the cover according to ec. Wind flow which denotes unobstructed wind flow with blockage less than or equal to 50.

When such end gable walls are not provided it is necessary to provide lateral bracings connecting the last two trusses. Wind parallel to ridge roof angle q for wind in longitudinal direction use q 0 degrees assumed. The roof has been divided into four parts i e. Generic building wind load dialog in all four cases a green arrow plays a crucial role in correct load generation in lean to and ridge roof the arrows are generated automatically by fd but for flat roof.

Generic building s wind load as surface loads can be placed automatically on covers.