Long bridges tend to develop large deformations under the
action of intense dynamical loads such as wind or earthquakes.
Unless these deformations are controlled in some fashion, the
structure might suffer damage or even collapse. One possible
solution to this problem is to apply external forces to the
bridge through suspension cables.
This work presents an active robust control scheme to
suppress the vibrations caused by the vertical ground motion
due to an earthquake of a cable-stayed bridge. It is proven
both mathematically and through computer simulation that the
active nonlinear controller is capable of reducing the
amplitude of the vibrations to an arbitrarily small size. This
may save the bridge structure during a strong earthquake. It
is shown that the control scheme performs satisfactorily even
if parts of the system fail during an earthquake. An
alternative method to derive the control law using finite
elements is also presented. / Graduation date: 1993
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36738 |
| Date | 26 February 1993 |
| Creators | Scheer, Dietmar |
| Contributors | Magana, Mario E. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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