Constitutive model for soil amplification of ground shaking: Parameter calibration,comparisons, validation |
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| Institution: | 1. LTDS (UMR 5513 CNRS), ENTPE, Université de Lyon, 3 rue Maurice Audin, 69120 Vaulx-en-Velin, France;2. MEEM/DGPR/SRNH/STEEGBH, Bureau d''Etude Technique et de Contrôle des Grands Barrages (BETCGB), 44 Avenue Marcelin Berthelot Grenoble, France;1. ARC Smart Pavements Hub, Department of Civil Engineering, Monash University, Victoria 3800, Australia;2. Geomechanics Group, Department of Civil Engineering, Monash University, Victoria 3800, Australia;3. Department of Civil Engineering, RMIT University, Melbourne, VIC 3001, Australia;1. Department of Civil and Environmental Engineering, Universidad del Norte, Colombia;2. Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, USA;3. Department of Civil and Environmental Engineering, Mansoura University, Egypt |
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| Abstract: | A one-dimensional constitutive model, developed for the nonlinear ground response analysis of layered soil deposits, is calibrated and validated experimentally in this paper. The small number of parameters renders the model easily implementable, yet quite flexible in effectively reproducing almost any type of experimentally observed hysteretic soil behavior. In particular, the model generates realistic shear modulus and damping curves as functions of shear strain, as well as stress–strain hysteresis loops. The model is calibrated against three sets of widely-used published shear modulus and damping (G : γ and ξ : γ) curves and a library of parameter values is assembled to facilitate its use. The model, along with a developed explicit finite-difference code, NL-DYAS, for analyzing the wave propagation in layered hysteretic soil deposits, is tested against established constitutive models and numerical tools such as Cyclic1D 12] and SHAKE 42], and validated against experimental data from two centrifuge tests. Emphasis is given on the proper assessment of the Vs profile in the centrifuge tests, on the role of soil nonlinearity, and on comparisons of two inelastic codes (NL-DYAS and Cyclic1D) with equivalent linear (SHAKE) analysis. |
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