Base Plate Design
Base Plate Design
(OP)
Hello, My name is Daniel.
I am designing a base plate connected to a pad foundation with a grade beam on top of the pad footing. I have a axial load and moment transfering to the foundation. I found a page that says that when moments act at a foundation, it is normal to replace them by a vertical load and an equivalent eccentricity. I would like to know the reason behind this. Thank you very much for your help
I am designing a base plate connected to a pad foundation with a grade beam on top of the pad footing. I have a axial load and moment transfering to the foundation. I found a page that says that when moments act at a foundation, it is normal to replace them by a vertical load and an equivalent eccentricity. I would like to know the reason behind this. Thank you very much for your help
RE: Base Plate Design
M = F x e
best regards
Klaus
RE: Base Plate Design
Dik
RE: Base Plate Design
if the (resulting) force is acting within the core section....the foundation will not turn over and there is no gap
between foundation and ground
therefor an existing moment can be transferred to force to see if this force is within this core area
best regards
Klaus
RE: Base Plate Design
Shouldnt It just be equal to the moment?
Thanks for your help.
RE: Base Plate Design
RE: Base Plate Design
It is more triangular in nature with the resultant at the kern of the triangular pressure prism, giving a greater eccentricity.
There is a good diagram and example in Blodgett's "Design of Welded Structures" on how to analyze the problem on pages 3.3-8 through 3.3-10.
I suggest you look there to start.
There are more complex models, but the equations listed do give a solution.
Mike McCann, PE, SE (WA)
RE: Base Plate Design
Dik
RE: Base Plate Design
Since the column is embedded in a grade beam, I might design the grade beam and column to grade beam connection to take the moment (unless is a tie beam rather than a grade beam designed for bending).
RE: Base Plate Design
Mike McCann, PE, SE (WA)