When you are running a live Webshaker experiment, you will specify the amplitude and frequency of the sinusoidal input signal and the duration of the experiment. Then, your command to shake is received by the web server in the Geomechanics Lab at UCSD, which processes the command and the shake table delivers the base motion to the test structure in the same way that an earthquake shakes buildings and other structures.
While the shaker and test structure are responding to the command signal, the server is also collecting data from sensors located on the structure which will be presented in several x-y graphs, displaying the response from different parts of the structure. Currently we have a single story aluminum structure with two LVDT's attached to the the structure, measuring the displacement of each floor of the structure during the experiment.
Results of Webshaker demonstration using a default sinusoidal input signal with amplitude 0.2 volt and frequency 4 Hz over 10 seconds under one-story model.