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Question 1 A 150 x 75 x 12 angle shown in Figure 1 is connected to a gusset plate using a E70XX 10mm weld. Using S355JR steel do the following. 1.1 Calculate the design tensile resistance of the angle. (15) 1.2 If the transverse weld is removed calculate the tensile resistance that will govern the design. (5) Note: Check all possible failure modes 145 mm T [20 Marks] 150 mm 260 mm Figure 1: Gusset Plate Connection

Steel Table 2.1 MECHANICAL PROPERTIES FOR STEEL TO SANS 50025-2 Yield stress f, (minimum) Ultimate for thickness (mm) tensile Grade strength 3cts 16 16<ts40 40s63 63<t≤80 80x1100 Test temperature f MPa mm mm mm mm mm "C S235JR 360 to 510 235 225 215 215 215 20 S235J0 360 to 510 235 225 215 215 215 0 S235J2 360 to 510 235 225 215 215 215 -20 S275JR 410 to 560 275 265 255 245 235 20 S275J0 410 to 560 275 265 255 245 235 0 S275J2 410 to 560 275 265 255 245 235 -20 S355JR 470 to 630 355 345 335 325 315 20 S355J0 470 to 630 355 345 335 325 315 0 S355J2 470 to 630 355 345 335 325 315 -20 27 Notes: 1. Consult standards for thicknesses bigger than 100 mm. 2. Minimum elongation in tensile test in order of 20% see standards. 3. Charpy tests on S235JR, S275JR or S355JR only required if specified. J Charpy V notch impact test Minimum average energy absorbed J 27 (only if specified) 27 27 27 (only if specified) 27 27 27 (only if specified) 27

A 3. a V₁ Vi U₂ kg/m mm mm 10 mm mm mm mm mm mm 5,16 6.75 5,65 7 7.39 7 6,37 4 8.34 8 4 7,07 8 9,29 8 4 11,4 8 4 9,94 10 12,3 10 5 8,04 10,6 10 Designation hxbxt 65 x 50 x 6 8 75 x 50 x 6 80 x 60 x 6 90 x 65 x 6 10 100 x 65 x 8 10 100 x 75 x 6 8 10 13,0 15,4 12 125 x 75 x 8 12,2 11 15.0 11 5.5 12 17,8 11 5,5 150 x 75 x 10 17,0 11 12 20,2 11 15 24,8 11 5,5 150 x 90 x 10 18.2 12 12 21,6 12 15 26,6 12 2 110 2222 mm deg 0,901 27.9 15.6 26,6 32,7 62,4 47,3 27,0 1,18 28,8 16,4 27,7 32,6 62,0 47,6 26,9 1,46 29,6 17,2 28,6 32,6 61,7 47,9 26,7 1,27 32,7 15,5 26.9 34,7 1,54 33.6 16,3 27.9 34,5 67.6 69,9 53,9 28,7 1,02 30,1 17.9 30.1 36.7 1,35 31.0 18.7 31.3 36.5 1.66 31.9 69,5 54,2 28,7 10 19.5 32,4 36,5 69,2 54,5 10 5 1.97 32,7 20,3 33,4 36.5 68.9 54,7 28,4 16.8 29,8 42,0 84,4 58,6 19,8 17.6 30.8 41.7 83,8 59,1 19.7 1.91 42.3 2,27 43,1 18,4 31,7 41,5 83.3 59,5 19,5 2.32 50.0 20.4 36.1 50.3 70.6 19.8 2.75 50,8 71,1 19.7 3.39 52,1 71,6 19,5 666 6 6 229 S 8888 R About x-x About v-v About y-y 1 2 1 1 2 10 mm 10mm mm 10mm 10mm mm 10mm 10mm mm 10mm 10 mm 1 2 1 1 2 1.89 28.0 31.0 0.902 16.5 21.4 2.30 29,6 40,0 0,676 11,6 20,9 2,74 3,02 36,5 39,7 0,821 3,54 43,2 39,5 0,955 14,3 20.7 3.34 39.9 41,8 0,499 12,0 16,9 20,5 3,91 17.2 19.7 6.24 21,0 19,4 7,54 21,0 25,1 5,91 24,8 24,9 6,94 6,27 58,5 50,5 0,883 17,5 69,1 50,2 1,04 84,2 49.8 1,26 About - 222 1 mm 10mm 10.6 8,44 19,1 56,2 33,3 34,2 0,495 13.5 15,9 99.8 DO 19.5 19.4 20.7 25.3 193 83,6 266