1. Operating Wind Design Calculations:
st
1.0 Wind Profile & Gust per API RP2A-wsd 21 Ed Dec 2000:
1.1 Wind Data: 1/12-YEAR RETURN/1-HR MEAN/ALL YEAR
UO = 54.462 ft/s 1 hour mean speed 16.600 m/s 10 m MSL
zr = 131.234 ft element elevation 40.00 m
t= 15 sec UO = 59.76 kph
to = 3600 sec UO = 37.13 mph
1.2 Wind Parameter:
Iu(z) = 0.06 x [1+0.0131 x UO] x (z/32.8)-0.22 §(2.3.2-3)
Iu(z) = 0.075782
C = 5.73 x 10-2 x (1+0.0457 x UO)1/2
C = 0.107029
1.3 Wind Profile:
U(z) = UO x [1+ C x ln(z/32.8)] §(2.3.2-2)
U(z) = 62.54 ft/s 42.64 mph
U(z) = 19.06 m/s 68.63 kph
1.4 Wind Gust Profile to time t:
u(z,t) = U(z) x [1- 0.41 x Iu(z) x ln(t/to)] §(2.3.2-1)
u(z,t) = 73.19 ft/s 49.91 mph
u(z,t) = 22.31 m/s 80.31 kph
1.5 Wind Speed and Pressure:
1.5.1 Shape Coefficients:
CS = 1.5 Beams
CS = 1.5 Sides of Building
CS = 0.5 Cylindrical
CS = 1.0 Overall projected Area of Platform
1.5.2 Element Shape Coefficients:
CS = 1.5 Flat surface!!!!
1.5.3 Wind Gust & Pressure at height z:
q = (ρ/2) x u(z,t)2 x CS where: ρ = 0.0023668slugs/ft3
1.5.4 Wind Pressure Profile at height z:
q= 6.944 psf
2
q= 0.332 kN/m
1.5.5 Gust Wind Pressure Profile at height z:
q= 9.510 psf
2
q= 0.455 kN/m Repair Operating wind pressure at z MSL
2.0 Conclusion:
Use Operating wind pressure at z (height) = 40 M MSL
2
q= 0.455 kN/m
Date/Time:11/12/201212:22 PM
Calculation by: Socrates L dela Pena File:f6-windcal-OPERATING_api
26 September 2006 Rev. 01 Page 1 of 1 Tab:Wind_Calculations