Layout Foundations
The RAM Structural System also includes a module for the design of foundations. Like the other modules, the foundations need to be modeled in the Modeler before they can be designed and they can be modeled even if no license for the Foundation Design module is available. Below is a reference for the final foundation layout. Note that the foundations are modeled on the lowest framed level, in this case the 2nd floor. There is no need to define a separate foundation level.
Note: Foundations should be placed at the level where the column or wall stops. This is typically the lowest level of a structure, but foundations may also be placed at elevated levels (e.g. in cases where you are modeling a partial basement). The bottom of all columns and walls will always be supported whether a foundation is modeled or not.
- Ensure the Floor type is set to 2nd.
- Select .
- Set the f’c to 4 (30).
- Set Unit Weight to 150 (2400).
- Set UW for Self-weight to 150 (2400).
- Set Fy to 60 (410).
- Click [Add].
- In the graphics mode add a continuous footing by clicking once at Grid A-3 and again at Grid A-5.
- Add another footing under each of the lateral frames.
- Select .
- Select all the same variables used with the continuous foundation.
- For the Orientation of the Footing’s Major axis, use Parallel to Column Web.
- Click [Single].
- Add a footing under each steel column and also the concrete columns on the perimeter.
- Right click to return to the Add Single command.
- Change the Footing Type to Pile Cap and click [Fence].
- Fence the interior columns on Grid 3.
- Select .
- Type 2 (0.75) for the Edge Offset and click [Add].
- With the cursor, click at each of the 4 corners of the 2 elevator shafts. The program will add the perimeter of the mat foundation to an area 3' larger than the pit on all sides.
- Select .
- Select the Mat Foundation
- Click [Whole Mat].
- In the graphics mode select anywhere within the mat perimeter and it should be filled in with a hatch pattern.
