00:01
Our structure is a truss structure with equilateral triangles.
00:06
The forces in the members are our internal forces that the members need to resist to maintain the equilibrium.
00:15
Second, we need to figure out what our equilibrium conditions are.
00:20
For our structure to be in equilibrium, the sum of our forces in any direction and and the sum of our moments must be zero.
00:28
So first if we consider our joint b, there are three members connected to this joint, bc, be, and bf.
00:38
The forces in these members are the unknowns that we need to find.
00:42
We can denote these as p of bc, p of be, and p of bf.
00:50
Our direction of these forces are along the members themselves.
00:54
Else, since our triangles are equilateral, our angles between them are going to be equal to 60 degrees...