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CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 8 of 19 <br /> CLAMP BODY STRENGTH: <br /> Stainless Steel casting (part casting number Z906-1): <br /> Typical yield strength=45 ksi, <br /> Fymin= 30 ksi2 lyV l8t54.01 114"[s:o) <br /> N r: �__;-1 J <br /> Controlling failure mode is from r� 125 <br /> bending failure at point where the `55 ='` --1. ... 1 0 <br /> 00 <br /> body arm meets the base. °. 1nt <br /> 6 , eonvoiling failure point <br /> f r I <br /> i <br /> 2.125 cv ',; �� <br /> 1 fJf� ► 175 <br /> � - E� <br /> e.--1,-"� - '— I p m <br /> .125 8r <br /> d► <br /> AlIfr ": j:11/8-[28A3 1,, r5 <br /> Controlling section properties: <br /> IXX=0.0009 in4 <br /> S,x=0.0043 in3 <br /> ZXX=0.009 in3 <br /> OK =oFyZ=0.9*30ksi*0.009in3=243"# <br /> Determine maximum horizontal service load <br /> Hs= ¢Mn/(1.6*0.55") = 243"#/(1.6*0.55") =276# <br /> For loading in opposite direction: <br /> Load is supported by cast leg piece attached to main clamp body using (two)#10 screws. The <br /> load is resisted by a couple formed between the screw tension,compression at the bottom of the <br /> casting and shear across the pegs that fit into 21)s„[54.01 1/4"[6.01 <br /> receiver holes on the main body. / <br /> Screw strength: ' <br /> OTn=0.75*67.5ksi*0.0175 int= 886#each j -- �-- 1 , <br /> Ts=OT./1.6= 886/1.6=55/I# i °?, <br /> 6 <br /> Shear strength of the pegs: ` ` �' 171 a I <br /> E <br /> t Vn=0.75*17ksi*(0.172) =368#each 0 ;_ AMIE I 1201 a <br /> Vs=t Vn/(1.6) = 368/1.6=230#each <br /> c <br /> From Eforces: <br /> H= -T <br /> V=-C <br /> From EM about bottom at location where C acts <br /> M=H*1.32"+0.37T+0.18V=0 <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 /> /Y <br />