Chapter 17451(b)Try m=4 strandsFt=84+3.2d21+232.2=2.12+3.4d2kipFf=12.1dkipn=12.1d2.12+3.4d2Comparing tables, multiple ropes supporting the load increases the factor of safety,and reduces the corresponding wire rope diameter, a useful perspective.17-32n=adb/m+cd2dndd=(b/m+cd2)a−ad(2cd)(b/m+cd2)2=0From whichd*=bmcAns.n*=a√b/(mc)(b/m)+c[b/(mc)]=a2mbcAns.These results agree closely with Prob. 17-31 solution. The small differences are due torounding in Prob. 17-31.
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