excel windload calculator
TRANSCRIPT
WINDLOAD CALCULATOR based on representative segment of building
a FREE DOWNLOAD from griffithplans.com (other calculators FREE at griffithplans.com)Read additional instructions before using (available at griffithplans.com)MAKE ENTRIES IN YELLOW BLANKS ONLY BOLD ENTRIES ARE FORMULAS... DO NOT CHANGE
PROJECT: SAMPLE BUILDING
DATE 1/17/2007 BUILDING SEGMENTS ASCE equiv mph
BASIC WINDSPEED 105 mph 125 mph 3 sec gustsDEGREE OF ROOF SLOPE 22.619864623 degrees (from table below)
ROOF PITCH enter rise 5 in 12 degrees roof pitchROOF span 36 ft 4.763639 1/12
ROOF WIDTH usually matches wall length ft 65 ft include overhangs 9.4623218 2/12
ROOF SF WEIGHT lbs 25 lbs 14.036243 3/12
ROOF OVERHANG 1 ft in span direction 18.417758 4/12
TOTAL ROOF HEIGHT above wall 8.00 ft to peak or high point 22.619865 5/12TOTAL BUILDING HEIGHT to roof peak 20.00 ft 26.565051 6/12
WALL LENGTH long wall 65 ft 30.256436 7/12
WALL HEIGHT 12 ft 33.687423 8/12
FASCIA LEADING EDGE 6 in high 32.5 36.869898 9/12
WALL SF WEIGHT 25 lbs 39.805569 10/12WALL WEIGHT per long wall 19500 lbs 1 if flat .5 if peak 42.51044 11/12
SLOPE LENGTH to highpoint 26.50 ft 0.5 45 12/12
TOTAL ROOF AREA 3,445 sf 1WINDWARD ROOF AREA 1,723 sf 135.00 0
TOTAL ROOF WEIGHT 86,125 lbs enter 1 for hip roofWALL WINDLOAD AREA per long wall 780 sf
degree to radians conversionFOOTING DEPTH ft 1.33 ft 22.61986 degrees
WIDTH ft 1.33 ft 0.39479 radiansif footing segments LENGTH ft 65 ft
1 total WT per cf 150 lbs 2.480437 Coeff Lift = 2 * pi * angle of attack in radians
65 ft long ea totalCF conc 115 cf17,247 lbs ea TOTAL FOOTING WT 17,247 lbs = 4.26 cy concrete
WALL, FOOTING AND ROOF WT LESS UPLIFT 66,817 lbs RESULT MUST BE POSITIVE TO PREVENT LIFTING
TOTAL long WALL, FOOTING AND ROOF WT. 122,872 lbs
WINDWARD WALL TOTAL 22,015 lbs by: velocity squared times .00256).
WINDWARD WALL PRESSURE PSF 28 psfLEEWARD WALL SUCTION PSF 25,383 psf
SIDE WALL SUCTION PSF 25,383 psf
TOTAL ROOF UPLIFT leeward 56,055 LIFT=.5*.00238*VELsquared*SFarea*CL
TOTAL ROOF PRESSURE windward 56,055 lbsWINDWARD ROOF PRESSURE 33 PSF
LEEWARD ROOF UPLIFT PSF 33 PSF 1Griffithplans.com has stock plans, custom plans, and free const calculators and const information.
obtain from local wind maps