analysis for foundation
analysis for foundation
(OP)
I had a debate with my colleague on the boundary condition of the foundation in computer modelling. His idea is to assume the foundation to be pinned end. That means no moment is transfered to the pile cap or pad foundation. It also means the pressure exerted on the piles or the pad footing is even through out. I thought the force would only be evened out only if the pad foundation or pile cap is "thick" enough.
Moreover, I don't think a pinned end structure exists in rc buildings. It means the stump is allowed to rotate and CRACK.
comments?
Moreover, I don't think a pinned end structure exists in rc buildings. It means the stump is allowed to rotate and CRACK.
comments?





RE: analysis for foundation
you have. Pin end is conservative for superstructure
moments. It is not appropriate for foundation design and
connection to pedestal. It is best if you can generate
the foundation rotational stiffness and use it as a spring
constant in the foundation nodes. You should use an
upper bound and a lower bound stiffness and take the more
conservative value for design. Sounds complicated, but
it will become routine after a few runs!
RE: analysis for foundation
The system you have described would not typically equate to a pinned condition, though it could be designed as such. It is usually considered a fixed condition to more correctly develop consistency in the moment transfer in the structure. RC structures can have some pinned considerations but are usually rigid frames.
RE: analysis for foundation