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Question 2 A grade S355JR steel beam is required to support the loads as shown in Figure 2 below. Lateral support to the compression flange will be provided at the position of the point loads, and the supports may be considered to be restrained against torsion. Initial calculations have shown that A 533 x 210 x 82 I-section is adequate. Ignoring the self- weight of the beam. Do the following: (30) 2.1 Draw the shear force and bending moment diagrams showing all critical values. (7) 2.2 Check shear and flexure on the critical segment B-C. (18) 2.3 Determine the magnitude of the maximum ultimate point load that could be placed on the beam directly above support D if the length of stiff bearing at the support is 100 mm. (consider yielding and crippling). (5) Dead load = 10 KN Live load = 9.5 KN Dead load = 21 kN Live load = 20 KN Dead load = 5 kN/m Live load = 2 kN/m 2m AL 2m 5m Figure 2: Simply supported beam [30 Marks]

Steel Table 2.1 MECHANICAL PROPERTIES FOR STEEL TO SANS 50025-2 Ted stress/ Umate br theness r terle stregh 360 L Am mm 215 215 215 215 MP an 5235360 to 510 235 225 215 52350360510 235 225 215 523542 360 to 510 235 225 215 $275,R 410 to 560 275 205 255 527530410560 275 52752410 560 275 215 215 245 235 265 255 245 235 265 255 245 235 S355JR 470 to 630 355 345 335 325 315 S355J0 470 630 355 345 335 53552 470 to 630 355 345 335 325 315 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 5235JR, 5275JR or S355JR only required if specified Chayat s Int tenperature Meinum age geabsorted C 2 20 27 ny specie 21 20 27 lyspected 27 only specified .RR....家 20 SSD3601 Major Test 1 2022 -20 20 -20 R NM 27 RR

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