Basement Wall or Canitlever Wall
Basement Wall or Canitlever Wall
(OP)
I have a 12' high concrete wall with a pre-engineered dome roof system that sits atop the wall.
My question is would you design the concrete wall as a basement type wall assuming that the roof system is bracing the top of the wall or would you design the wall as cantilevered? I do not have the reactions from the roof system yet but I do know from inspection that there will be both a vertical and horizontal reaction atop the wall.
Any insite would be appreciated.
Thanks
My question is would you design the concrete wall as a basement type wall assuming that the roof system is bracing the top of the wall or would you design the wall as cantilevered? I do not have the reactions from the roof system yet but I do know from inspection that there will be both a vertical and horizontal reaction atop the wall.
Any insite would be appreciated.
Thanks






RE: Basement Wall or Canitlever Wall
One other note, I would make sure that the wall is backfilled, and the formwork and shoring removed before the dome is set in place. You don't want the wall putting load into the dome. If the wall moves after the dome is set, then it will put load into the dome.
RE: Basement Wall or Canitlever Wall
RE: Basement Wall or Canitlever Wall
If the dome is loaded, and spreads a bit at the base, the wall would simply lean with it. The wall design would have to account for that lateral movement (sort of a hinge at the base) but would be designed as a simple span element - foundation to wall top at the dome base.
However, if the dome is not self-supporting and requires a separate tension ring or lateral support, then the wall should be designed either one of two ways:
1. As a cantilevered wall system that resists vertical loads and horizontal loads applied at the wall top.
2. As a simple span wall (foundation to wall top) with an integral tension tie built into the top portion of the wall (i.e. a build-up of horizontal reinforcement to take the tension). This is assuming the wall is continuous all the way around the dome perimeter.
RE: Basement Wall or Canitlever Wall
BA
RE: Basement Wall or Canitlever Wall
However, if it is anything else, then a retaining wall should be used with the rections from the dome structure properly applied.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Basement Wall or Canitlever Wall
RE: Basement Wall or Canitlever Wall
BA
RE: Basement Wall or Canitlever Wall
RE: Basement Wall or Canitlever Wall
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Basement Wall or Canitlever Wall
RE: Basement Wall or Canitlever Wall
BA
RE: Basement Wall or Canitlever Wall
RE: Basement Wall or Canitlever Wall
RE: Basement Wall or Canitlever Wall
StructuralEIT - That is one of my concerns there is no back fill on the wall. Previous plans show the wall to be supported by nothing more than a spread footing. To me this seems incorrect. Exspecially since there is a horizontal force component on the top of the wall.
The previous plans of this type of building that I have seen show a 12' high wall supported on a 6' wide spead footing with the wall centered on the footing. This is the reason for my question to me it seems like the only way to design the wall is as a cantilever but looking over the previous plans it appears that they designed it as a braced basement wall.
The roof system does not have any tension rings associated with it. It is more of an arched truss clear spanning the building.
RE: Basement Wall or Canitlever Wall
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RE: Basement Wall or Canitlever Wall
RE: Basement Wall or Canitlever Wall
So all the discussion above about tension rings is not applicable.
With an arch (unless it is tied per hokie66's comment) would have a lateral thrust - thus you would have to use a cantilevered wall design.
RE: Basement Wall or Canitlever Wall
BA