Basement Wall Design
Basement Wall Design
(OP)
I have an 11' deep basement in a residential construction. Do i have to tie the basement slab to my basement wall? up to now i was thinking to use 6" thick "floating foundation slab" but i have second thoughts. Then i guess the wall i can design as cantilever wall using the active earth pressure or a propped cantlever using the pressure at rest.
what are your thoughts on this?
thank you
what are your thoughts on this?
thank you





RE: Basement Wall Design
RE: Basement Wall Design
RE: Basement Wall Design
A basement or non-yielding wall relies on the floor diaphragm to distribute the lateral loads to another mechanism at the top of the wall, such as a floor or roof diaphragm, to prevent overturning.
There is another animal called a counterfort wall that is basically a yielding retaining wall, but a little different in how it behaves.
In that difference lies your answer in that the decision to use one or the other is based on:
1. The sequence of wall backfill with respect to the placement of the floor diaphragm;
2. The preferences, experience and expertise of the contractor, engineer or owner;
3. Whether or not the floor diaphragm can take the lateral load from a basement wall without interstitial walls or other complications.
4. Local geologic and soil conditions.
There are others, but these are a few considerations when msaking your decision.
Mike McCann
MMC Engineering
RE: Basement Wall Design
the other choice is to have a monolithic basement slab of 14" which seems excessive for a single family dwelling
RE: Basement Wall Design
RE: Basement Wall Design
The yielding or retaining wall situation is different in that the main toe and heel steel spans perpendicular to the wall steel. Again, the wall serves as a deep beam too. The slab can be separate, or cast as part of the toe of the retaining wall if so designed and properly reinforced.
Mike McCann
MMC Engineering
RE: Basement Wall Design
the walls by archtectural geometry have to be 16" thick and 11' deep.(12.5 ft to the bottom of the wall ftg).so i have decided to design them as cantilever retaining walls. however they are only secure against overturning when all the dead weight is on. (all the four stories built). i guess the contractor has to prop until then however how can i make sure that there will be not transfer of force to the ground floor and the wall will deflect prior to the placing of the floor?
RE: Basement Wall Design
RE: Basement Wall Design
If you have 4 stories of building supported on a retaining wall, it is not a cantilever wall. Design it as a basement wall spanning between the lower two floors. Design the floors to restrain the wall, and prevent backfilling until the wall restraint is complete.
mady2009,
Same advice, wait to backfill until the wall is restrained.
RE: Basement Wall Design
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Basement Wall Design
RE: Basement Wall Design
RE: Basement Wall Design
RE: Basement Wall Design
RE: Basement Wall Design
RE: Basement Wall Design