Understand the difference between ASCE 7-05 and ASCE 7-10
Many engineers were shocked to see the new wind speeds published in ASCE/SEI 7-10. In this code released by the American Society of Civil Engineers (ASCE) Structural Engineering Institute (SEI), it seems that a typical building went from a 50-year design wind load to a 700-year design wind load. It appears that wind speeds in the newer version were substantially higher than in ASCE 7-05.
The difference is in its approach.
ASCE 70-10 presents wind speed maps with return periods of 300, 700 and 1700 years for different importance or risk categories. Whereas the wind speed map in ASCE 7-05 uses a 50-year return period regardless of building importance or risk category.
However, if you check the load combination factors, you would realize that both versions of the code give you similar wind load calculations.
To keep it simple, wind loads calculated based on ASCE 7-05, should be factored by 1.26 to arrive at the same load calculations as ASCE 7-10.
#DesignLoads #BuildingDesign #SteelStructures #ASCE #SEI #StructuralEngineering #WindLoad
