Cantilever Framework Practice Exam Confusion

BenC1994 · May 3, 2015

Photo of a printed exam page showing question 2, a cantilever framework with a wall support at A, a joint at B, and a top member from D to C with 45 degree angles and a 5kN downward load at C; parts a to f are listed with marks.

Little bit stuck with this practice question for my exams, how do they suppose I work out the length of the individual beams or height of the framework without an initial length? Is there a secret way I've never heard of? Any help would be appreciated, it's foundation degree level but probably easier than other issues faced in the engineering sector..

jack action · May 3, 2015

You don't need them. Just do a FBD and you will see.

I started it for you. The blue lines are the reaction forces in the beams and the red lines are the components of the reaction force of the slanted beam. Sum of Fy = 0, sum of Fx = 0 ...

Free-body diagram of a cantilever truss framework attached to a vertical wall, with joints labelled A, B, C and D, 45 degree angles marked, a 5kN load at joint C, and a force parallelogram of blue and red arrows at C.

BenC1994 · May 3, 2015

jack action said:

You don't need them. Just do a FBD and you will see.

I started it for you. The blue lines are the reaction forces in the beams and the red lines are the components of the reaction force of the slanted beam. Sum of Fy = 0, sum of Fx = 0 ...

View attachment 83026

Ah thanks for that, much appreciated! Knew I was missing something.

Cantilever Framework Practice Exam Confusion

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