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32_ch 17 Mechanical Design budynas_SM_ch17

32_ch 17 Mechanical Design budynas_SM_ch17 -...

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Chapter 17 451 (b) Try m = 4 strands F t = 8 4 + 3 . 2 d 2 1 + 2 32 . 2 = 2 . 12 + 3 . 4 d 2 kip F f = 12 . 1 d kip n = 12 . 1 d 2 . 12 + 3 . 4 d 2 Comparing tables, multiple ropes supporting the load increases the factor of safety, and reduces the corresponding wire rope diameter, a useful perspective. 17-32 n = ad b / m + cd 2 dn dd = ( b / m + cd 2 ) a ad (2 cd ) ( b / m + cd 2 ) 2 = 0 From which d * = b mc Ans. n * = a b / ( mc ) ( b / m ) + c [ b / ( mc )] = a 2 m bc Ans. These results agree closely with Prob. 17-31 solution. The small differences are due to rounding in Prob. 17-31.
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