In this study, both ambient and earthquake data measured from the Bill Emerson Memorial Cable-stayed Bridge are reported and analyzed. Based on the seismic instrumentation data, the vibration characteristics of the bridge are investigated and used to validate a three-dimensional Finite Element (3-D FE) model of the bridge structure. The 3-D model is rigorous and comprehensive, representing realistic dynamic behaviors of the bridge. It takes into account the geometric nonlinear properties caused by cable sagging and soil-foundation-structure interaction in the Illinois approach of the bridge. The FE model is successfully verified and validated by using the natural frequencies and mode shapes of the bridge extracted from the measured data. With the calibrated model, time history analyses were performed to assess the condition of the bridge structure under a postulated design earthquake. Since the FE model is developed according to as-built drawings, the calibrated model can be used as a benchmark for safety evaluation and health monitoring of the cable-stayed bridge in the future.
G. Chen et al., "Assessment of the Bill Emerson Memorial Cable-Stayed Bridge based on Seismic Instrumentation Data," University of Missouri-Rolla, Sep 2007.
Civil, Architectural and Environmental Engineering
Missouri Department of Transportation
Keywords and Phrases
Cable-stayed bridge; finite element model; modal analysis; cable sagging effect; seismic excitation
Report - Technical
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