![]() ![]() New data suggests ASCE 7-05 wind speeds are conservative Implications – Net wind loads are decreasing Occupancy Category I Occupancy Category II Occupancy Category III Occupancy Category IVĪSCE 77-10 Strength Design Load Combinations ASCE 7-05 1.2D 1.6W L 0.5(Lr or S or R) 0.9D 1.6WĪSCE 7-10 1.2D 1.0W L 0.5(Lr or S or R) 0.9D 1.0W 12ĪSCE 77-10 Allowable Stress Design Load Combinations ASCE 7-05 D (W or 0.7E) 0.6D WĪSCE 7-05 D (0.6W or 0.7E) 0.6D 0.6W 13 Risk Category I Risk Category II Risk Category III Risk Category IV Risk Categories replace Occupancy Categories – – – – Strength design-based or “Ultimate” wind speeds Risk Category replaces the term 7 Occupancy Category ![]() ![]() Topics Discussed – Wind speed maps – Converting ASCE 7-10 pressures for design pressures on windows and doorsĪnswer to life, the universe, and everything?ĪSCE 77-10 Basic Wind Speeds Basic wind speeds didn’t changed at all from ASCE 7-98 through ASCE 705 3-sec gust wind speeds introduced in ASCE 7-95 to replace fastest-mile wind speeds Minor adjustments between ASCE 795 and ASCE 7-98 ģ new maps – Risk Category II (700 year return period) – Risk category III and IV (1700 year return period) – Risk Category I (300 year return period) Eric Stafford
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