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  1. magnum123456

    3D Beam element nodes deflection and stress calculation

    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...
  2. magnum123456

    3D Beam element nodes deflection and stress calculation

    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.
  3. magnum123456

    3D Beam element nodes deflection and stress calculation

    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...
  4. magnum123456

    3D Beam element nodes deflection and stress calculation

    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...

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