Evaluation of Key Performance Measures for the Kings Stormwater Crossing Birdge Using a Level IV Non-Destructive Damage Evaluation Method: System Identification and Damage Localization of the Kings Stormwater Channel Bridges

摘要

The objective of this report is to describe the system identification and nondestructive damage evaluation of two recently constructed bridges in southern California. The first structure is a conventional two-span monolithic reinforced concrete structure while the second structure, with almost identical superstructure geometry of the first structure is a composite structure comprised of reinforced concrete, lightweight concrete, and various combinations of fiber reinforced plastic components. Acceleration-time data for the structures were acquired in the field between May 3 5, 2001. Next, modal parameters were extracted from the field data. Finite element models of the structures were then developed to aid in the interpretation of the field data. The field data and finite element models were combined to produce more detailed finite element models of the structures. Treating the modal parameters of the updated finite element models and the extracted modal parameters from the field tests as the undamaged and damaged specimens respectively, a nondestructive damage detection of the as-built structures was performed.