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原文传递 Non-Destructive Estimate of the Rate of Change of Structural Degradation of the Lavic Road Overcrossing

题名：	Non-Destructive Estimate of the Rate of Change of Structural Degradation of the Lavic Road Overcrossing
作者：	N. StubbS.S. Park, R.W. Bolton, S. Choi, and C. Sikorsky
关键词：	modal parameter, systems identification, nondestructive damage evaluation, estimation of structural properties
摘要：	The objective of this study is to quantitatively evaluate, using recent work in nondestructive damage evaluation (NDE) and systems identification at Caltrans, the rate of possible structural stiffness deterioration of the Lavic Road Overcrossing (Bridge #54-734). The structure is suspected of having being constructed with reactive aggregates. To meet this objective, the following eight tasks were performed. First a modal test was performed on the bridge in December 1997. Second, a modal analysis was performed on the test data and selected modal parameters of the bridge were extract^. Third, a 3-dimensional finite element model of the superstructure and substructure of the bridge was developed. Fourth, using the finite element model and the frequency modal parameters extracted from die field data, baseline modal parameters for the bridge and mass and elastic parameters of the deck, column, and abutments were generated. Fifth, using the field modal parameters and the baseline modal parameters, potential damage in the structure at the member level was localized. Sixth, using the field modal parameters and a knowledge of die location of damage, a damage severity was assigned to each of the identified members. Seventh, using the location and severity of the damage along with die baseline model, the detailed structural properties of the existing bridge were estimated. Finally, each of the previous seven tasks were repeated nine months later (September 1998) and the magnitude of deterioration of the structural members was quantified for the elapsed period of time.
报告类型：	科技报告