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Experimental and numerical analyses of variability in the responses of imperfect slender free rigid blocks under random dynamic excitations

Abstract : Due to the well-known sensitivity of the behaviors of free structures under seismic excitations, the question of the aptitude of a numerical model to accurately represent them arise. To contribute to the answer to this question, this article presents experiments which were carried out on the shaking table of CEA/Saclay in France, on three rigid blocks with geometrical defects, inevitably due to the manufacturing process, subjected to 100 realizations of a random process. These tests were analyzed using specifically-developed indicators, and compared with the results yielded by two numerical models, one with a symmetrical geometry and the other with a non-symmetrical geometry, calibrated to reproduce out-of-plane behavior identified through release tests. Counter-intuitively, this article shows that a numerical model can predict motion over a longer period than an experiment performed on a supposedly identical block. From a statistical point of view, despite experimental uncertainties this article shows a good agreement between numerical and experimental results. Finally, a numerical study, performed using artificial seismic signals, showed that the assumption of perfect geometry can lead to an underestimation of the risk of overturning. Moreover, it is showed that a symmetrical model with a realistic slenderness correction can provide an overestimation of this risk under 1D excitation, but not in 2D.
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https://hal-cea.archives-ouvertes.fr/cea-02388675
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Submitted on : Monday, December 2, 2019 - 9:31:33 AM
Last modification on : Wednesday, October 7, 2020 - 3:37:50 AM

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Charlie Mathey, Cyril Feau, David Clair, Laurent Baillet, Michel Fogli. Experimental and numerical analyses of variability in the responses of imperfect slender free rigid blocks under random dynamic excitations. Engineering Structures, Elsevier, 2018, 172, pp.891-906. ⟨10.1016/j.engstruct.2018.06.064⟩. ⟨cea-02388675⟩

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