Pre-Engineered Rigid Frame on Tall Pier
Pre-Engineered Rigid Frame on Tall Pier
(OP)
I have a condition where the pre-engineered building we have is on a sloped grade but the architect wants the rigid frames to be the same size so at one end the pier comes up to grade and then as the grade slopes down the top of pier stays at the same elevation until the last rigid frame is sitting on a 5'-6" high pier (4'6" above grade and 1'-0" below.
The concern I have is that by just looking at the pure statics of it, the reactions in the hairpin ties going into the slab would appear to be significantly increased for this condition due to the lever action.
To clarify I have a 50 kip horizontal reaction at the top of the pier, then 4'-6" down to my slab, then another foot down to my 2ft thick footing.
Am I over thinking this or will the reaction in the hairpins be much larger like I'm thinking in this case? Any suggestions to lower it?
The concern I have is that by just looking at the pure statics of it, the reactions in the hairpin ties going into the slab would appear to be significantly increased for this condition due to the lever action.
To clarify I have a 50 kip horizontal reaction at the top of the pier, then 4'-6" down to my slab, then another foot down to my 2ft thick footing.
Am I over thinking this or will the reaction in the hairpins be much larger like I'm thinking in this case? Any suggestions to lower it?






RE: Pre-Engineered Rigid Frame on Tall Pier
Elsewise, you could design the footing and pier to resist all of the overturning (likely an unfeasible footing size) and the slab technically wouldn't need to provide any lateral support.
RE: Pre-Engineered Rigid Frame on Tall Pier
DaveAtkins
RE: Pre-Engineered Rigid Frame on Tall Pier
As I noted, it depends on how you are resolving the lateral forces, assuming a pin connection for your footing then yes the load into your slab would increase.
RE: Pre-Engineered Rigid Frame on Tall Pier
RE: Pre-Engineered Rigid Frame on Tall Pier
RE: Pre-Engineered Rigid Frame on Tall Pier
RE: Pre-Engineered Rigid Frame on Tall Pier
Mike McCann, PE, SE (WA)
RE: Pre-Engineered Rigid Frame on Tall Pier
gjc
RE: Pre-Engineered Rigid Frame on Tall Pier
RE: Pre-Engineered Rigid Frame on Tall Pier