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BracingConnection - Bolts for Connections For the bracing...

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Bolts for Connections For the bracing members, we investigate the number of bolts needed for connections. Bolts here are 3 / 4" diameter A325-SC bolts in standard holes. Connections must be slip-critical because braces experience complete reversal of axial force. Slip-critical strength of one bolt is k n R b N m T u D u T b N m T u D n R 4 . 10 1 = φ φµ = φ Where Nb is 1.l, and Tm is 28 kips for a 3 / 4" diameter bolt. The number of bolts needed for a brace connection is n R b N u P φ B & C Frames 2 & 5 Frames Upper Lower Upper Lower Pu, k 5.67 18.7 7.51 24.5 Nb min 0.545 1.80 0.72 2.36 Nb actual 4 4 4 4 Bolts, Σφ Rn, k 41.6 41.6 41.6 41.6 For bolted connections, we provide at least two bolts per row in the direction of the force, and we provide a concentric connection, whenever possible. If connections to flanges are used, then both flanges should be connected and both halves of each flange should be connected; that is, we don’t; connect to a flange on one side of the web only. Flange connections, therefore, require at least eight bolts. Connection to webs using two lines of two bolts each is adequate here. The bearing strength for holes in beam webs is shown below.
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