- #1
Chappu
- 5
- 0
Hi! I am having trouble with this frame. To make a long story short, I did the problem and got the right answer. The issue is that when I wanted to try solving the problem by exploding the structure into individual members, I couldn't get an answer anymore and it's bothering me because I do not understand why it would not work. Please refer to the attachment.
I did not get very far. I simply exploded the structure and looked at the 2 force members DE and CD (I put the 700N on one of them) and tried solving ∑Fx=0 and ∑Fy=0
For member CD:
∑Fx: Cx-Dx=0 -> Cx=Dx -> C(cos45°)=D(cos45°) -> C=D
∑Fy: Cy-Dy-700N=0 -> C(sin45°)-D(sin45°)=700N -> (replace above equation here)
C(sin45°)-C(sin45°)=700N -> 0=700N ?
I did not get very far. I simply exploded the structure and looked at the 2 force members DE and CD (I put the 700N on one of them) and tried solving ∑Fx=0 and ∑Fy=0
For member CD:
∑Fx: Cx-Dx=0 -> Cx=Dx -> C(cos45°)=D(cos45°) -> C=D
∑Fy: Cy-Dy-700N=0 -> C(sin45°)-D(sin45°)=700N -> (replace above equation here)
C(sin45°)-C(sin45°)=700N -> 0=700N ?
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