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Qs A 30-m long steel beam needs to be lifted on a construction site. The lifting forces are applied at the two points on the beam (as shown in Figure Q5). The density of steel is p-7800 kg/m3 m, and the beam has a uniform wide flange cross section W150x37. Assume the beam is subjected to the gravity load only in the lifting process. To ensure the safety of the lifting process, the engineer needs to determine the optimal locations of the lifting points that can minimize the maximum bending stress in the beam. Determine the optimal location and the corresponding maximum bending stress in the beam. (20 marks) a-L a L L=30 m Figure Q5
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