Moment frame restraint in "unrestrained" slab?
Moment frame restraint in "unrestrained" slab?
(OP)
I'm designing a stem wall foundation with an interior slab, 50'by70'. I need to restrain the moment frame thrust between piers. It's 25kips. I am proposing to tie the piers together with #5's across and through the slab. Everywhere but at the piers the slab edge has an expansion joint. I'm concerned that I am creating some cracking with some of the slab tied into the foundation and the rest free to expand and contract. I'm using .2% reinforcing in the slab based on temperature. Trying to keep this simple without a separate bond beam under the slab or fancy joints parrallel to the tension bars. thanks.






RE: Moment frame restraint in "unrestrained" slab?
RE: Moment frame restraint in "unrestrained" slab?
Mike McCann
MMC Engineering
RE: Moment frame restraint in "unrestrained" slab?
RE: Moment frame restraint in "unrestrained" slab?
I do this a lot for Horse arenas where there is no slab. I just bury the tie beam a couple of feet and it works fine.
Mike McCann
MMC Engineering
RE: Moment frame restraint in "unrestrained" slab?
I had a meeting with the contractor this morning, leaving this option out there as a possibility, and I'm drafting it up now before we issue. So now I'm putting a control joint over this area. I'm a little concerned with the rest of the slab settling over time in relation to these tie beams. I imagine the slabs rotating in opposite directions over the stiff beam. These will be the high areas between drains.
RE: Moment frame restraint in "unrestrained" slab?