Experimental and numerical response of rigid slender blocks with geometrical defects under seismic excitation
1 Laboratory of seismic mechanics CEA/DEN/DANS/DM2S/SEMT/EMSI 91 191 Gif-sur-Yvette, France
2 Institut Pascal UMR 6602 CNRS/UBP/IFMA BP 80 026, 63 171, Aubière, France
3 ISTerre, Université de Grenoble-Alpes CNRS/IRD/IFSTTAR BP 53, 38 041, Grenoble, France
a Corresponding author: firstname.lastname@example.org
The present work investigates on the influence of small geometrical defects on the behavior of slender rigid blocks. A comprehensive experimental campaign was carried out on one of the shake tables of CEA/Saclay in France. The tested model was a massive steel block with standard manufacturing quality. Release, free oscillations tests as well as shake table tests revealed a non-negligible out-of-plane motion even in the case of apparently plane initial conditions or excitations. This motion exhibits a highly reproducible part for a short duration that was used to calibrate a numerical geometrically asymmetrical model. The stability of this model when subjected to 2 000 artificial seismic horizontal bidirectional signals was compared to the stability of a symmetrical one. This study showed that the geometrical imperfections slightly increase the rocking and overturning probabilities under bidirectional seismic excitations in a narrow range of peak ground acceleration.
© Owned by the authors, published by EDP Sciences, 2015
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