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• <br /> CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 13 of 19 <br /> From IBC 2407 the minimum nominal glass thickness for infill panels in guards is 1/4" <br /> For point supported glass with pinned supports near each corner: <br /> Controlling moments are at panel edge (longest side) mid way between Z-clamps. <br /> M=C*w*b2 <br /> Bending Moment plate edge Bending Moment Plate Center <br /> 0.1650 0.1250 <br /> 0.1550 01163 <br /> 6, 0.1450 8 0.1075 <br /> 0.1350 0.0988 <br /> 0.1250 0.0900 <br /> 0.4 0.6 0.7 0.9 1.0 0.4 0.6 0.7 0.9 1.0 <br /> aro a/b <br /> Graph A Graph B <br /> Where a= shortest side,b =longest side <br /> C= Ce or G from graphs above derived from flat plate theory <br /> Moment at Z-clamps is nearly zero. <br /> For concentrated load at center of edge: <br /> Co = (1+a/b)1/3 <br /> Me=2*C*Co*P*x <br /> where x=distance between Z-clamps along loaded edge <br /> Resisting glass width=lesser of glass width or x/2 <br /> Example: glass size is 3'x 5' <br /> a/b = 3/5 =0.6 <br /> Co = (1+3/5)113 = 1.17. <br /> Ce=0.138 from graph A and Cc =0.1175 from Graph B <br /> Me= Ce*w*b2=0.138*25psf*5'2= 86.25'#/' at center edge of long side <br /> Mc= Cc*w*b2=0.1175*25psf*5'2=73.44'#/'at center of glass light <br /> Mep=2CoCe*P*b=2*1.17*0.138*50#*5 = 80.73'#/' at center of glass light <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 />