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Over the past few years Blue Road Research and the Univ ersity of California at San Di ego have been collaborating to develop a bridge health monitoring system using long gage length fiber optic strain sensors and modal analysis. Two programs supporting this effort have been funded by the National Science Foundation and from this work several papers have been pub lished showing its strong progress 1-5 . In 2002, the Federal Highway Administration and Caltrans performed a full-scale test on some of the components that will be used for the planned I-5/Gilman Advanced technology Bridge in California, USA. As a part of this test Blue Road Research used its developmental system to validate the use of this damage detection tec hnique and to compare the resu lts with conventional modal analysis tools. Keywords: Macroscopic strain, dynamic strain measurements, system identification, modal analysis, structural damage detection 1. I-5/GILMAN ADVANCED TECHNOLOGY BRIDGE The I-5/Gilman Advanced Technology Bridge currently in planning consists of a 137m (450 ft) long cable-stayed bridge supported by a 59m (193 ft) high A-frame pylon ( |
