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CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 17 of 19 <br /> 1/2"FULLY TEMPERED GLASS <br /> Weight= 6.5 psf <br /> tmin=0.469" <br /> For 1/2" glass S = 2*(0469)2=0.44 in3/ft <br /> Mallowable=6,000psi*0.44 in3/ft=2,640#"/ft=220'#/ft <br /> For wind load on infill glass apply 33% stress increase for SF=3.0 <br /> Mall=2,640"#*4/3 = 3,520#"/ft=293.33'#/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 /> Li/Ce=-✓(293.33'#/25psf) = 3.425 <br /> Assuming Ce=0.13: <br /> L= 3.425/(✓0.13)=9.5' (a/b = 3/9.5 =0.315,Ce=0.127 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*0.127*50*9.5'= 135.0'# <br /> Resisting width = 9.5/2=4.75'>3' limit to 3'width <br /> 135.0/3 =45.0< 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 /> Aa= iowb4/{910,746.8 psi *t3]} <br /> For a/b=3/5 =0.6; rho=0.0145 <br /> Aa= 0.0145*25/144*604/{910,746.8 psi *0.4693]} =0.35"<0.0167*60" = 1.0" <br /> Maximum wind load on 3'x5'light: <br /> b/a=3A=0.6 Ce=0.137 <br /> wmax=293.33/(0.137*52) = 85.6 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 elrobison@narrows.com <br />