Beam on a Elastic Foundation
Beam on a Elastic Foundation
(OP)
I am using sap 2000 to model a beam on an elastic foundation. My question is how do you model the spring at the end of the beam. The spring force is calculated by calculating the vertical modulus of sub grade reaction using Terzaghi equation, then to obtain the node spring reaction you multiplied the modulus sub grade reaction times the beam width times member length. For the interior spring this is not a problem, but for the end spring the member length is the distance to the next node/spring. Then should the end spring be placed between the end node and the adjacent node or at the end????





RE: Beam on a Elastic Foundation
Your calcs seem to be okay, except that if u locate the spring away from the end than u will have a tension built up on the bottom. This might be excessive.
U can do either of the following:
1. Locate springs at the supports only, or;
2. Locate springs at suitable intervals including ends.
Note: if there are no columns at the end than u can not locate spring at that point as cantilever action can not be alleviated.
A PDelta analysis will be more useful.
I am not sure with SAP 2000, but have done the same on Staad.
RE: Beam on a Elastic Foundation
Williams
RE: Beam on a Elastic Foundation
RE: Beam on a Elastic Foundation