26_ch 08 Mechanical Design budynas_SM_ch08

26_ch 08 Mechanical Design budynas_SM_ch08 - S sy = ....

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Chapter 8 229 8-40 Members: S y = 32 kpsi Bolts: S y = 92 kpsi, S sy = (0 . 577)92 = 53 . 08 kpsi Shear of bolts A s = 2 ± π (0 . 375) 2 4 ² = 0 . 221 in 2 τ = F s A s = 4 0 . 221 = 18 . 1 kpsi n = S sy τ = 53 . 08 18 . 1 = 2 . 93 Ans . Bearing on bolts A b = 2(0 . 25)(0 . 375) = 0 . 188 in 2 σ b = 4 0 . 188 =− 21 . 3 kpsi n = S y | σ b | = 92 |− 21 . 3 | = 4 . 32 Ans . Bearing on members n = S yc | σ b | = 32 |− 21 . 3 | = 1 . 50 Ans . Tension of members A t = (2 . 375 0 . 75)(1 / 4) = 0 . 406 in 2 σ t = 4 0 . 406 = 9 . 85 kpsi n = S y A t = 32 9 . 85 = 3 . 25 Ans . 8-41 Members: S y = 71 kpsi Bolts: S y = 92 kpsi,
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Unformatted text preview: S sy = . 577(92) = 53 . 08 kpsi Shear of bolts F = S sy A / n F s = 53 . 08(2)( / 4)(7 / 8) 2 1 . 8 = 35 . 46 kip Bearing on bolts F b = 2(7 / 8)(3 / 4)(92) 2 . 2 = 54 . 89 kip Bearing on members F b = 2(7 / 8)(3 / 4)(71) 2 . 4 = 38 . 83 kip...
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