Question

uestion 2 Consider the portal frame of Figure 2 having unequal beam and columns (Mu- 240kNm for the columns, Mu-720kNm for the girder), and carrying a horizontal load 40λ (kN) and a vertical load 60λ (KN). a) Find all possible "simple" and "combined" collapse mechanisms for the considered external loads. b) Find the loading factor you have identified. corresponding to the collapse loads of the various mechanisms c) Which of the collapse mechanisms you have found in a) is the "true" one? Why? 60λ 40kNm720kNm 240kNm 402 10m 5m 10m10m Figure 2 Answer: critical loading factor λ-2.4 corresponding to a "combined" mechanism

Answer 1

6ολ 1o m tom 1om SHn VMin' Beam Mechanim 6oA Mech antim 10mm 10m 192 3-2

2) SwAY Mechani 240と시 m 40X づ 24olclm 스 3.6 9- ←彩

2-16 :27 Ce 240 leNn

mini mum 2.4 ecauuse t- e