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CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 16 of 19 <br /> 3/8"FULLY TEMPERED GLASS <br /> Weight=4.75 psf <br /> tave=0.366" <br /> For 3/8"glass S =2*(0y 366)2=0.268 in3/ft <br /> Mallowable= 6,000psi*0.268 in3/ft= 1,607#"/ft= 133.92'#/ft <br /> For wind load on infill glass apply 33% stress increase for SF=3.0 <br /> Ma11= 1,607"#*4/3 =2,143#"/ft= 178.58'#/ft <br /> Moment for 36"wide lite (infill for 42"rail height) 25 psf wind load or 50 lb live load <br /> Determine maximum span: <br /> LVCe=A/(178.58'#/25psf) =2.673 <br /> Assuming Ce=0.13: <br /> L=2.673/0%.13) =7.41' (a/b= 3/7.41 =0.40,Ce=0.129 okay) <br /> Check for concentrated load: <br /> Mep=2CoCe*P*b check based on uniform load dimensions <br /> Mep=2(1+0.4)1'3*0.129*50*7.41'= 106.9'# <br /> Resisting width=7.41/2=3.7'>3' limit to 3'width <br /> 106.9/3 = 35.63 < 133.92'# okay <br /> Z-clamp strength limits glass light size to 5'for zinc clamps <br /> Verify Deflection: <br /> 36" wide by 60"long light for 25 psf load. <br /> Da= Y)owb4/{910,746.8 psi *t3]} <br /> For a/b= 3/5 =0.6; io=0.0145 <br /> Aa= 0.0145*25/144*604/{910,746.8 psi *0.3663]} =0.73" <0.0167*60" = 1.0" <br /> Maximum wind load on 3'x5'light: <br /> b/a=3/s=0.6Ce=0.137 <br /> wmax= 178.58/(0.137*52) =52.1 psf <br /> May be limited by clamp or anchor strength <br /> EDWARD C.ROBISON,PE <br /> 10012 Creviston Dr NW <br /> Gig Harbor,WA 98329 <br /> 253-858-0855/Fax 253-858-0856 efrobison@narrows.com <br />