Wind Velocity Pressures Example
- Harika Inanc (Unlicensed)
- Ömer Can Sagbas (Unlicensed)
Calculation the wind velocity pressures of 160 ft tall office building illustrated in Figure 1 using the analytical procedure of ASCE 7-05 referred to Kishor C. Mehta and William L. Colbourne - Wind Loads - Guide to the Wind Load Provisions of ASCE 7-05 (ASCE) (2011) .
Figure 1. High Building Example
Location : Near Houston, Texas
Topography : Homogeneous
Terrain : Suburban
Dimensions : 100ft x 200ft in plan
Roof height of 157 with 3 ft paraphet
Flat roof
Framing : Reinforced concrete rigid frame in both directions
Floor and roof slabs provide diaphragm action
Fundamental natural frequency is assumed to be greater than 1 Hz
Velocity pressures of MWFRS
Height, ft | Reference | Building Design Suite | Percent Difference | |||
|---|---|---|---|---|---|---|
Kz | qz, psf | Kz | qz, psf | Kz | qz, psf | |
0-15 | 0.57 | 17.9 | 0.57 | 17.86 | 0% | 0.22% |
30 | 0.70 | 21.9 | 0.70 | 21.93 | 0% | 0.13% |
50 | 0.81 | 25.4 | 0.81 | 25.33 | 0% | 0.27% |
80 | 0.93 | 29.1 | 0.93 | 29.03 | 0% | 0.24% |
120 | 1.04 | 32.6 | 1.04 | 32.59 | 0% | 0.03% |
157 | 1.12 | 35.1 | 1.12 | 35.09 | 0% | 0.02% |
160 | 1.13 | 35.4 | 1.13 | 35.41 | 0% | 0.02% |
Wall Cp for the example
Surface | L/B | Reference | Building Design Suite | Percent Difference |
|---|---|---|---|---|
Cp | Cp | Cp | ||
Windward Wall | All | 0.80 | 0.80 | 0% |
Leeward Wall
| 0.5 | -0.50 | -0.50 | 0% |
2 | -0.30 | -0.30 | 0% |
External Pressures for MWFRS: Wind Normal to 200-ft Face
Surface | z, ft | q, psf | Cp | Reference | Building Design Suite | Percent Difference |
|---|---|---|---|---|---|---|
External Pressures, psf | External Pressures, psf | External Pressures, psf | ||||
Windward Wall | 0-15 | 17.9 | 0.80 | 11.9 | 11.89 | 0.08% |
| 30 | 21.9 | 0.80 | 14.5 | 14.56 | 0.04% |
| 50 | 25.4 | 0.80 | 16.9 | 16.87 | 0.17% |
| 80 | 29.1 | 0.80 | 19.3 | 19.28 | 0.10% |
| 120 | 32.6 | 0.80 | 21.7 | 21.64 | 0.27% |
| 157 | 35.1 | 0.80 | 23.3 | 23.3 | 0% |
Leeward Wall | All | 35.1 | -0.50 | -14.6 | -14.6 | 0% |
External Pressures for MWFRS: Wind Normal to 100-ft Face
Surface | z, ft | q, psf | Cp | Reference | Building Design Suite | Percent Difference |
|---|---|---|---|---|---|---|
External Pressures, psf | External Pressures, psf | External Pressures, psf | ||||
Windward Wall | 0-15 | 17.9 | 0.80 | 11.9 | 11.89 | 0.08% |
| 30 | 21.9 | 0.80 | 14.5 | 14.56 | 0.04% |
| 50 | 25.4 | 0.80 | 16.9 | 16.87 | 0.17% |
| 80 | 29.1 | 0.80 | 19.3 | 19.28 | 0.10% |
| 120 | 32.6 | 0.80 | 21.7 | 21.64 | 0.27% |
| 157 | 35.1 | 0.80 | 23.3 | 23.3 | 0% |
Leeward Wall | All | 35.1 | -0.30 | -8.7 | -8.73 | 0.34% |
Verification object link