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CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 11 of 19 <br /> Zinc-alloy clamp cont: <br /> For loading in opposite direction: 2 s,:[54.0] I AE .0j <br /> Load is supported by cast leg piece attached to <br /> main clamp body using (two)#10 screws. The E <br /> load is resisted by a couple formed between the ;'; <br /> screw tension,compression at the bottom of the j H a <br /> casting and shear across the pegs that fit into <br /> receiver holes on the main body. <br /> kfi <br /> ; ; 17 <br /> Screw strength: <br /> OT„ =0.75*67.5ksi*0.0175 int= 886#each <br /> Ts= OT./1.6= 886/1.6=554# C <br /> Shear strength of the pegs: <br /> OVn=0.75*14ksi*(0.172) =303#each <br /> Vs=t Vn/(1.6) = 303/1.6 = 190#each <br /> From Eforces: <br /> H=-T <br /> V=-C <br /> From 1M about bottom at location where C acts <br /> M=H*1.32"+0.37T+0.18V=0 <br /> Assuming shear strength controls moment: <br /> substituting -H for T and Vs for V and solving for H <br /> (1.32-0.37)H=0.18*230#*2 <br /> H= 87# <br /> Mode II failure: <br /> Horizontal load is resisted by couple formed by compression between bottom corner and tension <br /> in screw: <br /> EM=0 =H*1.32"+T*0.37" <br /> setting T=Ts and solving for H <br /> H= (0.37'*554#*2)/1.32" =311# <br /> Bending strength of piece is same as for leg on main body,will control horizontal load. <br /> Maximum glass size for 25psf uniform infill load: <br /> A=4*87#/25psf= 13.92 sf(full area from floor to top rail and from post to post) <br /> Zinc-Alloy castings—For all installations loading is limited by clamp body strength to <br /> maximum horizontal load of 87#. <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 /> 3� <br />