A Wide Flange Built Up beam is supported at both ends by a fixed support and has a length of $6.8 \mathrm{~m}$ column to column. The flanges $(450 \mathrm{~mm} \times 20 \mathrm{~mm})$ are continuously welded to the web $(500 \mathrm{~mm} \times 18 \mathrm{~mm}$ ). The weight of the Built Up beam has a uniform load of $294 \mathrm{~N} / \mathrm{m}$ through-out its length. The brace is installed at both ends of the beam and has a space of $6.8 \mathrm{~m}$. The steel used is ASTM36. Determine the allowable bending stress of this beam. (25pts)

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