@captain_slow,
Thank you for your suggestion. I am a FEA engineer with limited mechanical knowledge. I have learned basic beam theory but have no knowledge on truss deflection. I will try to learn it.
The space steel frame is built by welding many steel tubes. Its global shape is prismatic and composed of longitudinal girder, lateral vertical column, transverse beam, and diagonal brace. It is put horizontally with support at every several meters, maybe can be called continuous beam. Vertical...
@ Tomfh
When modeling with BEAM element, the 3 rotational DOFs as well as the 3 translational DOFs of both ends are constrained. The same constraining method is used when modeling solid beam with BEAM element. But as you can see the solid beam shows fixed-fixed while the I beam and box beam...
Thank the answers from all of you! Sorry for my original ambiguous description.
I guess r13’s reply just answer my problem, i.e. I should include shear deformation in the hand calculation. Previously I do not know this. I will learn the Timoshenko beam theory to try to compare with FEA result...
Futher explanations are as follows.
In above figures, the second one is the results of the first one, i.e. the results of solid beams. The fourth is the results of the third, i.e.the I beams and box beams. The fifth shows a scheme of the load and boundary condition.
The hand-calculating...
Hi all,
Does anyone know why different deflection is obtained when the moment of inertia is identical? The following beam and solid all have the same moment of inertia along the global X axis. The load is a uniformly force on top of each model and all 6 DOFs of all the beams are constrained at...
Hi kingnero,
I think two kinds of weldment are involved in my structure, i.e. fillet weldment and flare-groove weldment which occurs at different regions of the joints. Only box cross section is involved in my structure but no circular section. The attached picture is an example which shows the...
Hi L_K,
I also guess joints with the highest Von Mises stress may be the ones needed to be checked. But I do not know if this is a common practice and I worry critical joints may be missed since the tube is modeled as beam in FEA and it seems there is no direct derivation which shows the joint...
Hi CANPRO,
Thank you for your suggestion! I think your idea is reasonable. So I have to check multiple joints to build my own's experience gradually...
Hi Dr Zoidber Woop,
Thank you for the suggestion on ignoring the weldment at heel for small angle weldment!
Sorry I have not explained very clearly. The point I am not sure is the method to choose the joint(s) in a large steel frame to validate. I think the critical joint should be checked...
The method I plan to use to extract loading of welding joint from global FEA is as follows. Maybe it is inefficient? Could anybody point out if my method is appropriate? Thank you!
(I am using ANSYS Workbench)
1. After solving the global FEA, obtain the following information of all beams
a...
Hi all,
Could anybody share experience when validating the welding strength of joints in steel frame what is the rule to choose the joint(s) to be validated? I was asked to validate welding joints with diheral angle lower than 30° in our steel frame which is composed of HSSs. I plan to extract...
