Search results for: F. Lopez-Caballero

Items from 1 to 8 out of 8 results

article

Spatial coherency analysis of seismic ground motions from a rock site dense array implemented during the Kefalonia 2014 aftershock sequence

A. Svay, V. Perron, A. Imtiaz, I. Zentner, more

Earthquake Engineering & Structural Dynamics > 46 > 12 > 1895 - 1917

The objective of studies presented in this paper is to analyse the spatial incoherency of seismic ground motions using signals from a velocimeter dense array located on a rock site, recording the aftershock sequence of the two M6 Kefalonia earthquakes that occurred in January/February 2014 (Kefalonia island, Greece). The analyses are carried out with both horizontal and vertical components of velocigrams...

article

Effect of coupling excess pore pressure and soil deformation on nonlinear SSI in liquefiable soil deposits

S. Montoya-Noguera, F. Lopez-Caballero

Bulletin of Earthquake Engineering > 2018 > 16 > 2 > 681-705

The current seismic design philosophy is based on nonlinear behavior of structures where the foundation soil is often simplified by a modification of the input acceleration depending on the expected site effects. The latter are generally limited to depend on the shear-wave velocity profile or a classification of the site. Findings presented in this work illustrate the importance of accounting for...

article

Bootstrapped Artificial Neural Networks for the seismic analysis of structural systems

E. Ferrario, N. Pedroni, E. Zio, F. Lopez-Caballero

Structural Safety > 2017 > 67 > C > 70-84

We look at the behavior of structural systems under the occurrence of seismic events with the aim of identifying the fragility curves. Artificial Neural Network (ANN) empirical regression models are employed as fast-running surrogates of the (long-running) Finite Element Models (FEMs) that are typically adopted for the simulation of the system structural response. However, the use of regression models...

article

Investigation of the earthquake ground motion coherence in heterogeneous non-linear soil deposits

F. Gatti, L. De Carvalho Paludo, A. Svay, F- Lopez-Caballero, more

Procedia Engineering > 2017 > 199 > C > 2354-2359

The physics-based numerical simulation is a reliable tool to build-up source-to-site strong ground motion earthquake scenarios. In this paper, we enhance those forward simulations by including (1) the hysteretic non-linear behaviour of geomaterials and (2) the heterogeneous nature of soils. Scattering-induced damping, ground motion spatial incoherence and de-amplification may therefore be reproduced...

article

Coupled S–P wave propagation in nonlinear regularized micromorphic media

I. Rapti, A. Modaressi-Farahmand-Razavi, A. Foucault, F. Lopez-Caballero, more

Computers and Geotechnics > 2016 > 77 > C > 106-114

Numerical simulations demonstrate mesh dependency problems which can change the response of the model, especially when localization phenomena emerge. The use of a regularization method, called first gradient of dilation, is evaluated for the analysis of shear bands under dynamic conditions. It aims to eliminate the mesh dependency of the results by taking into account an enriched kinematic approach...

article

The effect of preloading on the liquefaction cyclic strength of mixtures of sand and silt

C.A. Stamatopoulos, F. Lopez-Caballero, A. Modaressi-Farahmand-Razavi

Soil Dynamics and Earthquake Engineering > 2015 > 78 > Complete > 189-200

The paper studies the effect of preloading on the liquefaction cyclic strength of silty sands in the free field condition. This effect first is investigated by cyclic shear tests where horizontal shear stress oscillated about a zero mean value. Samples with varying fines content and at varying pre-stress ratios, densities and vertical stresses are tested. Test results show a marked increase of the...

article

Methodology for a probabilistic analysis of an RCC gravity dam construction. Modelling of temperature, hydration degree and ageing degree fields

A. Gaspar, F. Lopez-Caballero, A. Modaressi-Farahmand-Razavi, A. Gomes-Correia

Engineering Structures > 2014 > 65 > Complete > 99-110

This work intends to be a novel application of probabilistic tools to improve the comprehension of heat transfer phenomena during a roller-compacted-concrete (RCC) dam construction. A probabilistic thermal model is proposed to propagate uncertainties on some RCC’s physical properties. A thermo-chemo-mechanical model is used to describe the RCC behaviour. A global sensitivity analysis is performed...

article

Assessment of variability and uncertainties effects on the seismic response of a liquefiable soil profile

F. Lopez-Caballero, A. Modaressi-Farahmand-Razavi

Soil Dynamics and Earthquake Engineering > 2010 > 30 > 7 > 600-613

The present work deals with the evaluation of the effect of the randomness of both soil parameters and input motion on the seismic response of a sandy soil profile. Special attention is given to estimate the relative contribution of model input parameters on (i) the probability of liquefaction apparition and (ii) the surface seismic response. The Monte Carlo simulations were used for that purpose...

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