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CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 14 of 19 <br /> Deflection Plate Center <br /> Check glass deflections: 0.0300 <br /> At= riowb4/{Et3/[12(1 yt2)]} 0.0250 <br /> where: <br /> a=short side,b =long,side o 0.0200 <br /> w=greater of wind load,differential air pressure or <br /> 0.0150 <br /> live load(25 psf minimum) <br /> E= 10.4x106 psi for glass 0.0100 <br /> Y" =0.22 0.4 0.6 0.7 0.9 1.0 <br /> a/b <br /> Maximum deflection occurs at the center of the plate. <br /> At= riowb4/{10.4x106 psi *t3/[12(1-0.222)1} Graph C <br /> simplifying: <br /> At= iowb4/{910,746.8 psi *t3]} <br /> Allowable deflection: <br /> Based on maximum rotation of glass within Z clamp: <br /> K=0.03125" [1/2 hole clearance between glass and(steel rod+bushing diameter)] <br /> p =xlt=3rA/(L/2) substituting and solving for D <br /> Aa=LK/(25tt)=0.03125"*L/(23tt) <br /> Aa=0.03125"*L/(2*1tt) =0.005L/t <br /> For 1/4" glass <br /> Aa= 0.005L/0.25 = 0.02L <br /> For 3/8" glass <br /> Aa= 0.005L/0.375 = 0.0133L <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 />