grade beams for caissons
grade beams for caissons
(OP)
Do caissons, 24" dia. need grade beams if they are supporting precast concrete walls?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: grade beams for caissons
RE: grade beams for caissons
RE: grade beams for caissons
RE: grade beams for caissons
RE: grade beams for caissons
Another consideration is frost. Colder climates we typically have a grade beam to below the frost line if an interior slab is poured next to the wall.
RE: grade beams for caissons
If you intend to put a caisson under each panel joint, remember that during installation the first panel installed will induce an eccentric load that needs to be taken out in the caisson.
Also if your walls have significant axial loads then you cannot rely on the full width of the wall to resist this axial load your axial force would be transfered at the ends something between a deep beam and an upside down concentrated load on masonry.
If you are relying on the concrete panels for shear walls, then the isolated caissons would need to be designed for lateral load whereas with a grade beam it acts more like a continuous portal frame and is much stronger.
I doubt any code will give any specific restrictions on theis, you just need to be confident that it will work.
RE: grade beams for caissons
RE: grade beams for caissons
1808.2.23.1 Seismic Design Category C.
Where a structure is assigned to Seismic Design Category C in accordance with Section 1616, the following shall apply. Individual pile caps, piers or piles shall be interconnected by ties. Ties shall be capable of carrying, in tension and compression, a force equal to the product of the larger pile cap or column load times the seismic coefficient, SDS, divided by 10 unless it can be demonstrated that equivalent restraint is provided by reinforced concrete beams within slabs on grade or reinforced concrete slabs on grade or confinement by competent rock, hard cohesive soils or very dense granular soils.
RE: grade beams for caissons
RE: grade beams for caissons
RE: grade beams for caissons
I agree with using a precast wall to brace in-plane but this does not satisfy out-of-plane requirements.
STR04
RE: grade beams for caissons
RE: grade beams for caissons