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A steel frame has pinned supports at A and D and it has rigid joints at B and C. It is supported and loaded as shown in Figure Q3. The plastic moment for the columns AB and CD is 150 kN.m and for the beam BC is 300 kN.m. a) Use plastic analysis to determine the load factor for collapse. Consider all three possible collapse mechanisms. b) What would be the effect on your calculations if a lateral support was introduced to the structure at position C?FA

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