Laserfiche WebLink
STRUCTURAL ANALYSIS FOR NEW PHOTOVOLTAIC SOLAR SYSTEM <br />NOTE: <br />THESE CALCULATIONS ARE BASED ON INFORMATION AND MEASUREMENTS PROVIDED BY THE CONTRACTOR FROM <br />HIS SITE INSPECTION. <br />3 Analysis of Existing Rafter Capacity:PV SOLAR ARRAY: HOANG RESIDENCE <br />1202 S. KAREN AVENUE, SANTA ANA, CA 92704 <br />Rafter Loads: <br />Solar system dead load = 882 lbs / 26 lag bolts total = 33.9 lbs at each lag bolt <br />Existing roof dead load = 12.5 psf <br />Snow load = 0 psf <br />Roof live load = 20 psf <br />Wind load = 119.5 lbs, 614.6 lbs <br />Rafter span = 11.0 ft <br />Load Combinations That Apply: <br />#1: D + Lr or S = 12.5 psf + 33.9 lbs at each lag bolt + 20.0 psf <br />#2: D + 0.75(0.6W) + 0.75(Lr or S) = 12.5 psf + 33.9 lbs at each lag bolt) + (0.75 (0.6) 119.5 lbs at each lag bolt) + <br />(0.75 ( 20 psf)) <br />#3: 0.6D + 0.6W = 0.6 ( 12.5 psf + 33.9 lbs at each lag bolt) - (0.6) 614.6 lbs at each lag bolt <br />Calculated Maximum Bending Moment: <br />#1: 491.6 ft/lbs + 93.3 ft/lbs = 584.9 ft/lbs <br />[( 33 psf) ( 11 ft^2)] / 8 = 491.6 ft/lbs <br />[( 33.93 lbs) ( 11.0 ft)] / 4 = 93.32 ft/lbs <br />#2: 189.1 ft/lbs + 93.3 ft/lbs + 147.9 ft/lbs + 226.9 ft/lbs = 657.2 ft/lbs <br />[( 12.5 psf) ( 11 ft^2)] / 8 = 189.1 ft/lbs <br />[( 33.93 lbs) ( 11.0 ft)] / 4 = 93.32 ft/lbs <br />119.5 lbs) ( 11 ft)] / 4 = 147.9 ft/lbs <br />0.75 [( 20 psf) ( 11 ft^2)] / 8 = 226.9 ft/lbs <br />#3: 113.4 ft/lbs + 56.0 ft/lbs - 1014.1 ft/lbs = -844.7 ft/lbs <br />0.6 [( 12.5 psf) ( 11 ft^2)] / 8 = 113.4 ft/lbs <br />0.6 [( 33.93 lbs) ( 11.0 ft)] / 4 = 55.99 ft/lbs <br />0.6 [( 614.6 lbs) ( 11 ft)] / 4 = 1014.1 ft/lbs <br />Section Required: 844.7 ft/lbs (12) (0.7) / 1518 psi = 4.7 cu in <br />Section Provided: 1.5 ( 5.5 ^2) / 6 = 7.6 cu in <br />7.6 cu in > 4.7 cu in, OK <br />Calculated Deflection: <br />[5( 32.5 psf / 12) ( 132 in^4)] / [384 (1200000) ( 20.8 )] = 0.43 in <br />Allowable Deflection: 132 in / 240 = 0.55 in <br />0.55 in > 0.43 in, OK <br />NOTICE: VISION CIVIL ENGINEERING: JENNIFER KEMME, PE <br />ANY CHANGES TO OR USES OF THESE DOCUMENTS 12273 11TH STREET, YUCAIPA, CA 92399 <br />WITHOUT THE WRITTEN CONSENT OF VISION 909.754.8300, JENKEMME@VISIONCE.COM <br />CIVIL ENGINEERING IS STRICTLY PROHIBITED. RCE 73054, EXP 12/31/22 <br />0.75 [(0.6)( <br />Prepared by JENNIFER KEMME 5/11/2022 Page 2 <br />1202 S Karen Ave <br />06/29/22