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3.1. Calculate the ultimate load of a propped cantilever, span L, carrying a UDL of w per unit length. Assume the cantilever has a constant plastic moment Mp. Calculate the collapse load of the continuous beam shown in figure 3.36. Which is the critical span? 3.2. 3.3. Draw the interaction diagram for collapse of the portal frame shown in figure 3.37. Assume V and H can vary independently of each other. 3.4. The pinned-foot portal frame in figure 3.38 carries vertical and horizon- tal forces. If Mp is equal to 300 kN m, determine: (a) the critical collapse mechanism, (b) the load factor against collapse, (c) the BMD at collapse. Determine the value of A at collapse of the frame shown in figure 3.39. Draw the BMD at collapse. 3.5. 3.6. Find the interaction diagram for collapse of the pitched portal frame shown in figure 3.40, assuming that Vand H can vary independently. What are the collapse loads and mechanisms when V = H and V = 5H? 214/
What are the collapse loads and mechanisms when V = H and V = SH? Ringer L 2M₂ HA M₂ V 3L Figure 3.36 M₂ constant Figure 3.37 2L 2M₂ 2L H
Plastic MedforStel and Concrete Ser SELAN 100 N F13 Fig 1.30 co F340 Collof Simple Fre 37. The pitched portal frame shown in figum 141 was originally dnigned to carry a single vertical load 2Wat the intersection of the rates BC and CD the plastic moment M, for the columns and rais being equal The frame is to be redesigned for the loading shown in the figues Find the safe value of if the plastic moment of the ons is now to be duced to 75 per cent of its value in the original design