125 marks Question 5 Figure Q5 shows a rigid-jointed rectangular portal franc subject to a horizontal force Wand to a mi

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125 Marks Question 5 Figure Q5 Shows A Rigid Jointed Rectangular Portal Franc Subject To A Horizontal Force Wand To A Mi 1 (44.01 KiB) Viewed 12 times

125 marks Question 5 Figure Q5 shows a rigid-jointed rectangular portal franc subject to a horizontal force Wand to a mid-span vertical force 2W. The frame is pinned at A and fixed at D. Members have different ultimate plastic bending moment capacity as shown in Figure Q5. (a) Sketch all likely collapse mechanisms for the frame, indicating clearly the location of the plastic hinges and the plastic rotations 19 marks) a) Determine the value of W for each collapse mechanism. Out of the values of W you have found which one corresponds to the true collapse mechanism? Why? [16 marks) 2w WB 200 kNm 4.0 100 kNm 300 kNm A D 20n ----2.00 2.0m Figure 25