In summary, the conversation discusses a framework with three unknown members, making it statically indeterminate and difficult to solve using equations of statics alone. To solve for the member forces, a different approach, such as using Castigliano's theorems, is recommended.
#1
question dude
80
0
The framework is attached below. I've tried going to each joint and resolving the forces vertically and horizontally. I've got to joint B and I'm stuck, because I have three unknown members there. And its the same if I go to joint J.
Can you set up 2 equations at 4 joints and solve for 8 unknowns?
#3
pongo38
739
27
You are stuck because the frame is statically indeterminate. This means that the equations of statics alone are insufficent to solve for the member forces. If you want to proceed you have to introduce another equation related to the member properties AE. There are a number of different approaches to this, including use of Castigliano's theorems. That is what I suggest you look up.
