yes, now I only have a formula [stiffness][d]=[F] in my program, and is able to solve the displacement of nodes for different beam frame structure. What my target is to find another formula which is to solve the stress of nodes, then I can complete my program.
Thanks Jenkins, the link is so...
Jenkins,
this is what I am confused. Node 3 has no any external force, so how can I know the bending moment,shear force, axial force and torsion in the node 3.
Thanks Jenkins,
for [stiffness matrix][d]=[F],like the picture example, my calculation is:
1. each beam matrix has 12 [d] and 12 [F],
2. combine the matrix to form a global matrix, result in 48 [d] and 48 [F],
3. solve the 48 [d] by the known 48 [F],
"You use the [d] to calculate the [F} at...
Hi all,
I am wirting a c++ program to calculate 3D beam elements deflection and stress, like the following picture:
I have defined the stiffness matrix and calculate by the formula [stiffness matrix][d]=[F].
There are 6 dof in each node including 3 deflection and 3 rotation.
My program can...
