Solidworks FEA
Solidworks FEA
(OP)
Good morning fellow engineers,
I am working on a linear static analysis of a part(as shown in attached pdf) which is attached to concrete wall with 8 hilti anchor bolts. I am trying to find out the shear and tensile load acting on the anchor bolt due to load(as shown in pdf). When I use the foundation bolt, then the results I got on shear and axial load is shown on the attached pdf which is definitely incorrect. I am trying to understand what am I doing wrong.
I could use the other approach where I create a split surface to represent the washer and then set a fixed face constraint on that and eventually find the reaction load on that fixed face. But then I run into problems of stress singularities during mesh refinement. Also when the option of foundation bolt is there, there should be no need of alternate approach.
Thank You
KD
I am working on a linear static analysis of a part(as shown in attached pdf) which is attached to concrete wall with 8 hilti anchor bolts. I am trying to find out the shear and tensile load acting on the anchor bolt due to load(as shown in pdf). When I use the foundation bolt, then the results I got on shear and axial load is shown on the attached pdf which is definitely incorrect. I am trying to understand what am I doing wrong.
I could use the other approach where I create a split surface to represent the washer and then set a fixed face constraint on that and eventually find the reaction load on that fixed face. But then I run into problems of stress singularities during mesh refinement. Also when the option of foundation bolt is there, there should be no need of alternate approach.
Thank You
KD
RE: Solidworks FEA
RE: Solidworks FEA
The second approach looks fine for me. And stress singularities may be problem for the result presentation, it may not be a problem for force calculation. Try mesh convergence study with 2-4 mesh sizes or elastic-plastic model and then conclude that the stress is not going to be as high as shown by analysis.
IMO, it will be easy to find out the forces using analytical formulae.
RE: Solidworks FEA
I imagine you have 3D elements for the brkt, why not !?
so at the support I'd have an RBE spider (joining all the nodes on the bore of each hole to a central node) This node I'd add 3 finite stiffness constraints (three translation directions) ... many ways to do this (I like to use 3 rods, each to a hard constraint). The stiffness value is not really important, something like 1E6 to 1E4.
If you want the added complexity, constrain the lower edge (as it bears against the concrete).
another day in paradise, or is paradise one day closer ?
RE: Solidworks FEA
Since the 2020 version, it's possible to select the distributed coupling instead of a rigid connection. Maybe it could give you better results if you don't use it now.
RE: Solidworks FEA
RE: Solidworks FEA
RE: Solidworks FEA
RE: Solidworks FEA
https://www.youtube.com/watch?v=_Q9PBJGwggM (for reference)
Solid works simulation creates the mesh by itself and yes it is 3d element.
So your method involves manual creation of mesh and then u are setting the constraints on a center of those nodes.. Is that right? I do not think I can manually create mesh (nodes) in sold works simulations
RE: Solidworks FEA
RE: Solidworks FEA
another day in paradise, or is paradise one day closer ?
RE: Solidworks FEA
RE: Solidworks FEA
I do not think there will be much variation in forces if you make the mesh fine depending on how software calculates the forces. I think that these are reactions force and should not be changing in case you adopt approach 2 if approach 1 is not working.
May be, approach 1 can give you exact result. Try a simple problem with single bolt and check what you are missing from help documentation as suggested by others.
RE: Solidworks FEA
What's the objective of your calculation? To design/check the anchor bolts?
I'm all for the use of FEA, but for anchor design it is often not necessary.
Anchor bolt suppliers often provide excellent formulas or software to conservatively design fasteners for the most common type of loads, brackets etc. Building code requirements are normally taken care of as well. For Hilti the software was called Profis Anchor at least a few years ago.
Hope this helps
PB
RE: Solidworks FEA
RE: Solidworks FEA
RE: Solidworks FEA
RE: Solidworks FEA
Yes, I want to check both anchor and the design of plate. I think I can use the split line and find if the steel design works and then separately check anchor bolts to see if they works
I saw profis the other day but unfortunately we have a stock of anchor bolts from other supplier (dewalt). Dewalt has a similar software but poorly designed and doesn't have a lot of options like hilti profis. I was thinking to use profis and set the anchor bolt size and then may be find some similar product from dewalt