Dynamics Testing and Modeling of NTS Microwave Tower

摘要

A dynamic evaluation of a typical NTS microwave tower was recently performed. This evaluation consisted of constructing a finite element model of the tower (using the GEMINI code). This model was then verified by performing a modal, or dynamic, test on the tower and then adjusting the finite element parameters so that the predicted resonant frequencies and mode shapes were in agreement with those actually measured. Based on the results of this dynamic evaluation it was found that the one of the modes of the guy wires coupled directly into the second mode of the microwave tower itself. In addition to this particular evaluation, this project has produced a ''calibrated'' finite element model of a typical NTS microwave tower that should be very useful in understanding the basic dynamics involved. Using this model, it is possible to predict the response motion and critical stresses in a tower when exposed to nuclear event ground motion. (ERA citation 12:025757)