Question

The rectangular frame is composed of four perimeter two-force members and two cables AC and BD which are incapable of supporting compression. Determine the forces in all members due to the load L in position (a) and then in position (b). Forces are positive if in tension, negative if in compression.

Answer 1

Your question is lacking some information attached is the missing part and the solution

A) AB = AD = BD = 0, BC = LC

AC =
`(5L)/(3)T, CD = (4L)/(3) C`

B) AB = AD = BC = BD = 0

AC =
`(5L)/(3) T, CD = (4L)/(3) C`

Step-by-step explanation:

A) Forces in all members due to the load L in position A

assuming that BD goes slack from an inspection of Joint B

AB = 0 and BC = LC from Joint D, AD = 0 and CD = 4L/3 C

B) steps to arrive to the answer is attached below

AB = AD = BC = BD = 0

AC =
`(5L)/(3) T, CD = (4L)/(3)C`