Large-Amplitude Forced Vibration Testing for St-Id of Bridges and Foundation Reuse Assessment
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2020-01-01
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Edition:Final report, 09/01/2018 – 12/31/2019
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Abstract:This study presents the results of the research on the characterization of unknown bridge foundations by means of dynamic testing for their potential reuse based on the estimation of their ultimate bearing capacity as a limit state. In this project, the applicability of using large-amplitude mobile shakers in tandem with finite element models for sub-structural identification is examined. By exploiting dynamic features of structures, such as dynamic amplification and knowledge of eigenmodes, significantly lower magnitudes of load can be implemented diagnostically as a global nondestructive evaluation (NDE) technique while having notable response levels. The assessment of bridge foundations reuse through the evaluation of the dynamic response of the bridge above the foundation is carried out. This is accomplished by i) examining material properties extracted from dynamic testing of the foundation/soil system to provide empirical estimates of bearing capacity, or ii) evaluating the global dynamic response of the bridge-foundation system and relating it to failure mechanisms. In this report, the known foundation and soil properties problem is presented as a proof of concept. The methodology and preliminary results from field testing and numerical simulations are presented. The unknown foundation and soil properties are addressed in an appendix of the work presented in this report.
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