Modal Identification of Bill Emerson Bridge

Abstract eng:
The Bill Emerson Memorial Bridge is well known as it has been used worldwide as the Benchmark model for the structural control problem of cable-stayed bridges under seismic excitation. In addition, this bridge has also been used for structural health monitoring studies. 83 sensors were installed on the bridge and surrounding soil to monitor the action of the bridge after construction. This paper presents the modal identification of the bridge based on experimental data. The Eigensystem Realization Algorithm (ERA) in conjunction with the Natural Excitation Technique (NexT) is employed to analyze the ambient vibration records from sixteen of the eighty-three channels of acceleration from the bridge. To validate the modal identification results, estimated modal parameters are compared to those from the finite element model of the bridge and the identification results from other researchers.

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