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Verification of computer analysis models for suspension bridges.
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2009-08-01
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[PDF-3.79 MB]
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Abstract:The Vincent Thomas Bridge, connecting Terminal Island with San Pedro, serves both Los Angeles
and Long Beach ports, two busiest ports in the west coast of USA. The bridge carries an
overwhelming number of traffic with an Annual Average Daily Traffic (AADT) volume of 45,500,
many of which are cargo trucks. Based on the recent finding that the main span of the Vincent
Thomas Bridge crosses directly over the Palos Verdes fault, which has the capacity to produce a
devastating earthquake, the bridge underwent a major retrofit in spring 2000, mainly using visco
elastic dampers. This study focuses on performance evaluation of the retrofitted bridge under
seismic, wind and traffic loads. A member-based detailed three-dimensional Finite Element (FE) as
well as panel-based simplified models of the bridge are developed. In order to show the
appropriateness of these models, eigenproperties of the bridge models are evaluated and compared
with the system identification results obtained using ambient vibration. In addition, model validation
is also performed by simulating and comparing with the measured dynamic response during two
recent earthquakes. FE model is also updated using a sensitivity-based parameter updating method.
Effect of spatial variability of ground motions on seismic displacement and force demands is
investigated. To record actual wind velocity and direction, three anemometers are installed at three
different locations of the bridge. Response of the bridge is computed under wind velocity. Finally,
analysis of the bridge under traffic load is also carried out.
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