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PROJECT: Trang Solar Panels <br />CLIENT:V.S. <br />BY:DM <br />Doug Engineering <br />Civil Engineering <br />SHT.2 OF <br />DATE <br />DE JOB NO. VS-6832 <br />2 <br />3/31/2014 <br />CHECK SCREW ATTACHMENTS FOR WIND UPLIFT <br />Pwuptilt =119.9 Ib 5/16" Lag with min 2.5" penetration for each attachment <br />Table 11.2A - NDS - Lag Screw Withdrawal Values <br />For 5/16" Lag into .5G wood 266 Ib <br />Allowable wind load = 1.6*2.5*266 1064 Ib >120 Ib OK <br />Unirac Selection <br />Load for half a panel = 2.7' <br />WUNIRAC =57.78 pif <br />Per the Unirac Manual for 60 pif, the max span <br />for Solar Mount Unirac Rails is 6.5' <br />Use L-Foot SolarMount Rails with a spacing of 72" o.c. max for attachment points, typ. <br />Table 8. L-Foot SolarMount Series Rail Span <br />SM - SolarMount HD - SolarMount Heavy Duty <br />(R) <br />2 <br />15 <br />3 <br />33 <br />4 <br />43 <br />0 <br />7 <br />75 <br />8 <br />9 <br />93 <br />I0 <br />10.5 <br />11.5 <br />I2 <br />12-5 <br />w = £)&01!,uted Load *U) <br />20 25 30 40 50 FA 80 100 120 140 160 180 200 220 240 260 280 300 <br />SM SM SM SM 91 SM SM SM SM SM SM SM 91 SM SM SM 91 Stl <br />SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM SM <br />SM SM SM SM SM SM SM SM SM SM SM SM 91 SM SM SM j <br />SM SM SM SM 91 SM SM SM 91 SM SM SM 91 SM j <br />SM SM SM SM 91 SM SM SM 91 SM SM MD <br />SM SM SM SM 91 SM SM SM Sri SM HO <br />SM SM SM SM SM SM SM SM HD HD <br />SM SM SM SM 91 SM SM ID HD HD <br />SM SM SM SM SM HD HI) HD <br />SM SM SM SM 91 HD HD HD <br />SM SM SM SM Sri HD HD <br />SM SM SM SM 91 HD HD <br />SM SM SM SM HD HD <br />SM SM SM HD HD HD <br />SM SM SM HD HD HD <br />SM SM SM HD HD <br />SM SM HO HD HD <br />SM SM HD HD HD <br />SM MD HD HD HD <br />SM HD HD HD HD <br />H D 1-ED HD WD <br />HD HD HD HD <br />HD <br />HD <br />HD <br />LATERAL ANALYSIS <br />DETERMINE ADDITIONAL LOAD COMPARED TO EXISTING FOR LATERAL LOADING <br />Arootexisting= = 22 *Wpanet=2400 sf Wpanel = <br />\Nroofexisting = 9.7*2400 =23280 Ib <br />Wwallexisting = 15*80*4 =4800 Ib Wrestolarray = <br />42.1 Ib <br />926.2 Ib <br />234.08 Ib <br />Wexisting =28080 Ib <br />V = 0.182W <br />Vroofexisting =5111 Ib Existing Total Lateral Force <br />Vrootwpanels =5322 Ib New Total Later Force <br />array =1160.3 Ib <br />% increase =5322 <br />5111 <br />*100%-100% =4.1% <br />increase which results in less than a 10% increase in the stress of <br />existing lateral resisting elements OK