The analytical procedure for the Main Wind Force Resisting System (MWFRS) follows these sequential steps:
The formula for pressure depends on whether the building is "Rigid" (natural frequency $\geq 1$ Hz) or "Flexible" (requires consideration of Gust Effect Factors). For most low-rise rigid buildings: wind load calculation as per asce 7-05
Example: Building in Chicago (V=90 mph), Exposure C, Risk Category II (I=1.0), flat site (( K_zt=1.0 )), MWFRS (( K_d=0.85 )). The analytical procedure for the Main Wind Force
): Accounts for wind speed-up over hills or ridges (Section 6.5.7). Generally 0.85 for buildings (Table 6-4). 2. The Governing Equations Risk Category II (I=1.0)
: Reserved for complex, irregular, or very flexible structures where standard formulas may not be accurate. Key Steps for Analytical Procedure (Method 2) The fundamental equation for velocity pressure (