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Q7. A box section cantilever beam has an overall depth of 160 mm, an overall width of 120 mm and is fabricated so that it is uniform over its entire 2 m span. The top and bottom plates are 20 mm thick whilst the side plates are 10 mm thick. The maximum bending stress is restricted to 40 MN/m².

Calculate the maximum concentrated mass that can be supported on the free end of the beam. (16)

Note:

Density for steel= 7860 kg/m³.