Bolted Connections 327 Use the following parameters for the floor framing shown

Question

Bolted Connections 327 Use the following parameters for the floor framing shown in Figure 9-46: Determine the following: a. Find the factored reaction at B-1, B-2, G-1, and G-2. b. Select an all-bolted, double angle connection Connection material is ASTM A36 Beams are ASTM A992, grade 50 Dead load is 75 psf, live load is 100 psf, ignore live from AISCM Table 10-1 and sketch the detail for each end connection and include copes where needed. load reduction Use 3/4", A325 bolts in STD holes B-1: W18 35, B-2: W16 26 G-1: W24 × 55, B-2: W21 × 44 c. Check bolt bearing at each member. d. For beams with copes, check the capacity at the cope. B2 B2 B1 B1 B1 35'-0" 35'-0" FIGURE 9-46 Framing Plan for Problem 9-10

Explanation / Answer

a) Factored reaction

B1 = 54kips

B2 = 36kips

G2 = 30kips

c) bolt bearing for each connection

Vbf = 2.5x d x t x fu

Where

fu= smaller of the ultimate tensile stress ofthe bolt and the ultimate tensile stress of the plate

d= nominal diameter of the bolt

t= thicknesses of the connected plates experiencing bearing stress inthe same direction

fu =120ksi

B1 = 2.5x (3/4)x0.3x120 = 67.5kips

B2 = 2.5x (3/4)x0.425x120 = 95.625kips

G1 = 2.5x (3/4)x0.505x120 = 113.625kips

G2 = 2.5x (3/4)x0.250x120 = 101.25kips

d) capacity of the copes

   Vnbf =2.2dtfup

B1 = 2.2 x 3/4 x 0.3 x 92 = 45.54kips

B2 = 2.2 x 3/4 x 0.250 x 92 = 37.95kips

G1 = 2.2 x 3/4 x 0.505 x 92 = 76.65kips

G2 = 2.2 x 3/4 x 0.450 x 92 = 68.31kips

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