Wind Load On Roof Top Equipment

The upward movement of the wind exerts an uplift load on the roof and the roof must be able to resist this uplift.

Wind load on roof top equipment.

The study by kopp and traczuk 2007 provides the basis for the lateral and uplift wind force coefficients used in asce7 10 2010. To determine wind loading on rooftop equipment the first step is to identify the building risk category formerly the occupancy category and the building location. And kopp and traczuk 2007. The code wind load provisions for roof mounted equipment in asce7 10 2010 are primarily based on wind loads obtained from model scale wind tunnel measurements by hosoya et al 2001.

While the commentary alluded to a high uplift component of wind loads that should be considered in the design of rooftop structures asce 7 05 provisions did not provide a method for calculating this uplift. Components cladding wind load provisions roofs walls 3. There are slight variations in the two codes but typically each will. Asce 7 05 provided an equation to generate a horizontal main wind force resisting system mwfrs wind load on rooftop equipment.

Loads on rooftop equipment should be determined in accordance with the 2005 edition of asce 7. A typical uplift load limit assumes a maximum wind speed of about 90 miles per. As an initial step in the design process or post event repairs it is recommended that designers calculate wind loads on rooftop equipment in accordance with asce 7 16 or the local building code whichever procedure results in the highest loads. In 2002 the american society of civil engineers added rooftop equipment design requirements into its asce 7 code document minimum design loads for buildings and other structures smith says to reference the 2005 edition of asce 7 because the 2002 criteria were somewhat non conservative.

Wind loads for signs other structures roof top structures equipment other special conditions 4. Wind loads on non standard buildings asce 7 10 wind. Basics of wind load provisions mwfrs s 2. The provisions contained within asce 7 10 for determining the wind loads on rooftop equipment on buildings is limited to buildings with a mean roof height h 60 feet.

For guidance on load calculations see calculating wind loads and anchorage requirements for rooftop equipment ashrae journal volume 48 number 3 march 2006. 1 determine wind loads using asce 7 05. A minimum safety factor of 3 is recommended for. Wind tunnel applications for buildings 5.

The risk category is determined from section 1604 5 and table 1604 5 of the ibc or table 1 5 1 of asce 7 10.