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Simulating a Centrifuge Test using the Opensees Framework

Contributor: Antonios Vytiniotis [avytin at MIT dot EDU]

This manual describes the basic OpenSees features needed for the simulation of vertically propagating shear waves in a scale model in a centrifuge. GID has been used for pre- and post- processing. For relatively simple configurations (even the one used in this paradigm) a pre-processor might not be needed, but a post-processor is necessary to visualize field output results. For every presented feature an example command is excerpted from the example tcl file and explained in detail. This tutorial does not explain though in every detail all the options associated in the various commands used. For this, the reader is directed to the OpenSees manual (the most recent is the on-line version of it). The commands and features used in this analysis have been tested with OpenSees versions 1.74, 1.75 and 2.0 but should also work for newer versions too. In case an example does not work, I would be obliged to hear about possible problems at avytin [at] mit . edu.

This manual explains how one can create a .tcl file that could be read and executed by the OpenSees interpreter. Notice should be taken that OpenSees is dimensionless, so the user must make sure that he uses a consistent system of units (e.g. SI).

Once an example.tcl file has been created, the user can then simply run OpenSees.exe, and in turn, write in the command line of the interpreter "source example.tcl" to run his analysis. Download CentrifugeExample.tcl

In This Chapter

Simulated Geometry

Elements Used

Materials Used

Treatment of Boundary Conditions

Solution Procedure

Results

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