Wind Load — MWFRS (Directional Procedure)
Compute wind pressures on the Main Wind Force Resisting System (MWFRS) for an enclosed or partially enclosed regular-shaped building using ASCE 7-22 Chapter 27 Part 1 (Directional Procedure). Determines velocity pressure at each height, external pressure coefficients for windward, leeward, side walls, and roof, and combines them with internal pressure to obtain net design pressures on each building surface.
What this calculates
Basic wind speed (V) based on Risk Category, velocity pressure exposure coefficient (Kz) at each height per Table 26.10-1, velocity pressure qz = 0.00256·Kz·Kzt·Kd·Ke·V², external pressure coefficients (Cp) per Figure 27.3-1, internal pressure coefficient (GCpi), and net design wind pressure p = q·G·Cp − qi·(GCpi) on each surface.
Inputs
3-second gust wind speed per ASCE 7-22 wind speed maps
Exposure B, C, or D per Section 26.7
Mean roof height
Building width perpendicular to wind
Building length parallel to wind
Roof slope angle
Topographic speed-up factor (1.0 for flat terrain)
Directionality factor per Table 26.6-1 (0.85 for buildings)
Enclosed, partially enclosed, or open
Outputs
Velocity pressure at mean roof height
Net design pressure on windward wall at roof height
Net design pressure on leeward wall
Net roof pressure in the upwind zone
Total wind base shear on the building
Methodology
Per ASCE 7-22 Chapter 26 (wind speed, exposure, topography) and Chapter 27 Part 1 (Directional Procedure for MWFRS). Risk category determines the basic wind speed map used. Exposure category (B, C, or D) determines Kz profile per Table 26.10-1. Topographic factor Kzt per Section 26.8. Wind directionality factor Kd per Table 26.6-1. Ground elevation factor Ke per Section 26.9. Gust-effect factor G per Section 26.11 (rigid buildings G = 0.85). External pressure coefficients Cp from Figure 27.3-1 for windward, leeward, sidewall, and roof surfaces.
Code References
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