Question

A two-dimensional two-pinned portal frame ABCDE is pinned to rigid supports at positions A and E, and a concentrated couple of 350 kNm acting clockwise is applied at C as shown in Figure Q3. All members of the portal frame are made from the same steel section. 350 kNm 6 m EI CONSTANT FOR ALL MEMBERS 6 m 4 m Fgure Q3 Determine, using methods incorporating strain energy where appropriate. the magnitude and direction of the vertical and horizontal reactions (in kN) at position A; a) (14 marks) Draw an annotated sketch of the bending moment diagram for the portal frame (4 marks) b) indicating all significant values and points of interest c) Other than loads applied directly to the structure, describe three effects that can (3 marks) generate internal forces in a two-pinned portal frame; Briefly describe the structural advantages that would be gained if the connections at d) the bases of the columns of the portal frame had been capable of moment transfer (2 marks) rather than pinned connections Sketch the bending moment diagram for the portal frame assuming that the e) connections at the bases of the columns are capable of moment transfer (2 marks)

Answer 1

Am C. Er- Gonstant -3.54ん, し Hence, cue need ro reİeaje one redundent force. Let it hence, H HE-H sftei eney. For Seqment A0 (Ut ) Hence( 5min energy, LA 2 ET

QEL 0 EL 2EL ET E L Et E D EL 504 H =2100 にし ET

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