56. A concentrated mass M is allowed to fall through a height of 12 mm to strike a simply supported steel joist at mid-s

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56. A concentrated mass M is allowed to fall through a height of 12 mm to strike a simply supported steel joist at mid-s

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56 A Concentrated Mass M Is Allowed To Fall Through A Height Of 12 Mm To Strike A Simply Supported Steel Joist At Mid S 1
56 A Concentrated Mass M Is Allowed To Fall Through A Height Of 12 Mm To Strike A Simply Supported Steel Joist At Mid S 1 (25.35 KiB) Viewed 30 times
56. A concentrated mass M is allowed to fall through a height of 12 mm to strike a simply supported steel joist at mid-span. The joist has a span of 3.6 m and for the cross-section, the depth is 240 mm and the second moment of area, Ixx 80 x 10-8 m. Calculate the maximum value of M if the momentary bending stress in the joist must not exceed 120 MN/mº. Neglect the loss of energy at impact. E = 200 GN/mº. (U. Lond.) (Ans.: 1.406 Mg)
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