Strand 7 1

If somebody could send me an example of strand 7 footing modelling, it will be much appreciated. I have spent one week try to model this. Thank you

Check out the supplied Verification Manual for some worked examples. (Installs as a PDF file in the program folder, together with model files for all verification models.)

Some more details about what you are trying to do, and what problems you have had, would be useful.

What you do depends on how much detail you want to go into and the size and shape of the footings. If you are looking at structural design of a straightforward footing it should be adequate to model the footing with beam elements along the footing mid-depth, with offset elements to the base, and model the soil with 8 noded plane strain plate elements, extending far enough so that boundary effects are not significant. Restrain the plates in the X and Y direction at the bottom of the mesh, and X only at the edges.

You will then get the bending and shear in the footing and the soil stresses directly.

Don't expect the results to agree with a traditional simple analysis with a trapezoidal soil pressure distribution, which is really a fiction used for simplifying design.

Doug Jenkins
Interactive Design Services

If you are prepared to reduce the soil support to a simple "modulus of subgrade reaction", thereby inducing apoplexy in all geotechnical engineers, you can model just the concrete, using plate or brick elements as appropriate. You can then take advantage of Strand7's "face support" attribute to represent the Winkler support from the soil. (Face support can be specified for either plate or brick elements.)

I have tried to model as commented, but still can not get a result. Maybe, i am still new to strand 7 software.

Kelvin - please give more details about exactly what problems you are having.

Do you mean the solver stops with an error, or what?

Doug Jenkins
Interactive Design Services