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Utilization of Strong-Motion Data for Assessment of Structural Integrity in Instrumented Highway Bridges

by Virginia Mosquera, Andrew W. Smyth and Raimondo Betti

Virginia Mosquera, Andrew W. Smyth and Raimondo Betti (2009). Utilization of Strong-Motion Data for Assessment of Structural Integrity in Instrumented Highway Bridges SMIP09 Seminar on Utilization of Strong-Motion Data, p. 65 - 84.

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Abstract

This study focuses on the use of strong motion data recorded during earthquakes and aftershocks to provide a preliminary assessment of the structural integrity and possible damage in bridges. A system identification technique is used to determine dynamical characteristics and high-fidelity first-order linear models of four bridges from low level earthquake excitations. A finite element model (FEM) was developed and updated to simulate data from a damaging earthquake for one of the bridges. The difference between data recorded or simulated by FEM and data predicted by the linear model was used to detect damage. The use of this technique can provide an almost immediate, yet reliable, assessment of the structural health after a seismic event.