Corner Baseplate Example 1

[EngDM]

Typically I have been using Simpson or Hilti's anchor design software to aid in the design of baseplates for cross bracing applications. However, my current configuration is giving the old "Itteration Failed" error in Simpson. The load Simpson accepts before the error is much lower than my design load.

Does anyone know where I can find an example of the design of this baseplate shape? The CSA Blue book does not really help with baseplates all that much aside from some standard square ones.

Need to determine the thickness required of plate and force in the anchors, though for the latter I'm sure I could interpolate Simpson's values. Breakouts are going to be restrained by the grade beam reinforcing since my gradebeam is at a corner.

 

[KootK]

I'm not familiar with that, typically I use FEM to model my baseplates.

This need not change your approach but the sketch below shows something to be aware of. Whether it's PROFIS, IdeaStatica, or any other FEM toy that models connections locally, they will tend to miss the horizontal force couple shown below that will be present in many practical situations. That will tend to reduce the moment at the base to something less than T x e and, also, create a situation where the moment is self limiting. As always, the degree to which this occurs depends on the relative stiffness of the various mechanisms.

 

[Celt83]

".. Simpson before the itteration fails,...."

Interesting that Simpson's tool has an iteration failure, not sure if you tried running this in my spreadsheet but if so you probably noticed under the tension load case mine probably popped up 2 or 3 messages saying bad guess that was it failing to find a solution based on some of the initial condition assumptions. Since it's a 4 variable optimization problem it can diverge rapidly for these more odd conditions if the initial guesses are too far from the "solution".

 

[EngDM]

".. Simpson before the itteration fails,...."

Interesting that Simpson's tool has an iteration failure, not sure if you tried running this in my spreadsheet but if so you probably noticed under the tension load case mine probably popped up 2 or 3 messages saying bad guess that was it failing to find a solution based on some of the initial condition assumptions. Since it's a 4 variable optimization problem it can diverge rapidly for these more odd conditions if the initial guesses are too far from the "solution".

I did try running it in your spreadsheet and it gave me an answer. Hilti PROFIS also gave me a solution but the free version doesn't perform FEA.

I've spoken with Simpson regarding the itteration failures and they told me they are fixing that in an upcoming update.