Im mostly interested in question C but you might need the other questions to get the answers 4. Consider the portal...
4. Consider the portal frame illustrated in Figure 04. The frame is subjected to two point loads as shown. The two vertical members have a plastic moment capacity 2.M, while the horizontal member has a plastic moment capacity M,. Use the Virtual Work Method to answer the following questions: (a) Identify all collapse mechanisms and calculate their corresponding load combinations. 10 marks) (b) Plot a graph with Pi against P2 showing the region of safe load combinations and the failure envelope. 5 marks] (c) Determine which mechanism causes plastic collapse when P1 2P2; and further check whether the yield condition is satisfied or not by sketching the corresponding bending moment diagram [10 marks] 2m Im 2m Figure Q4
4. Consider the portal frame illustrated in Figure 04. The frame is subjected to two point loads as shown. The two vertical members have a plastic moment capacity 2.M, while the horizontal member has a plastic moment capacity M,. Use the Virtual Work Method to answer the following questions: (a) Identify all collapse mechanisms and calculate their corresponding load combinations. 10 marks) (b) Plot a graph with Pi against P2 showing the region of safe load combinations and the failure envelope. 5 marks] (c) Determine which mechanism causes plastic collapse when P1 2P2; and further check whether the yield condition is satisfied or not by sketching the corresponding bending moment diagram [10 marks] 2m Im 2m Figure Q4