2. A double-channel shape, 2C10 x 20 steel, Fy = 50 ksi and Fu = 70 ksi, is used for a built-up tension member as shown in the figure. The holes are for 1/2-inch-diameter bolts. a. Determine the design strength for LRFD. b. Determine the allowable strength for ASD. 2½" 2/2" Shape C12x30 X25 x20.7 PNA by C10x30 Area, Depth, A d Thickness, t tw 2 in.² in. in. C15x50 14.7 15.0 15 0.716 11/16 x40 11.8 15.0 15 0.520 2 x33.9 10.0 15.0 15 0.400 d 8.81 12.0 7.34 12.0 6.08 12.0 8.81 10.0 x25 x20 x15.3 4.48 10.0 7.35 10.0 5.87 10.0 Web 12 0.510 2 12 0.387 12 0.282 5/16 10 0.673 11/16 10 0.526 2 10 0.379 38 10 0.240 4 4" Table 1-5 C-Shapes Dimensions Flange in. 3/8 1/4 3.52 32 3/16 3.40 38 4" 1/4 3.17 38 3/16 3.05 3 3/16 2.94 3 Width, b; in. 3.72 34 0.650 5/8 4" 4" 3/8 3.03 3 1/4 2.89 278 3/16 2.74 234 18 2.60 Average Thickness, tr in. Work- k Table 1716 0.650 8 1/16 0.650 % 17/16 Distance Gage in. in. in. in. in. 12/8 24 2 Y2 934 1349 0.501 21% 0.501 2 1½ 0.501 2 1% 0.436 7/16 1/16 0.436 7/16 1/16 0.436 7/16 1/16 28 0.436 7/16 1/16 ho 8 1.17 14.4 1.15 14.4 1.13 14.4 1.01 11.5 1.00 11.5 0.983 11.5 0.924 9.56 1349 1349 0.911 9.56 12 0.894 9.56 12 0.868 9.56

Determine the effective net area of the tension member shown in the figure. 000 3"3" L6 X 6 X 1/2 %-in. bolts Ciri2 ENGINEERING Section STEEL DESIGN 1.67"

Problem 3. An un-equal leg angle L8x4x2 made of ASTM A242 steel (Fy = 50 ksi, Fu = 70 ksi) is used as a tension member and connected to a gusset plate as shown in Figure 2 (a to d). ASABINCAT SALLALALALALALALALAL w₁ Weld * Gusset Rate 3 (c) Longitudinal and transverse welds O 18x4x2 Gusset Plate Steel Type: A242 18x4x2 bolts: 3/4 dia. Steel Type: A242 T (d) Bolted connection (d) Calculate factored fracture strength of the tension member in Figure 2(c). (e) Calculate factored fracture strength of the tension member in Figure 2(d). (f) What is the maximum permissible length for this tension member?

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