Examinando por Autor "Jaramillo, Juan Diego"
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Ítem Analysis of the role of diffraction in topographic site effects using boundary element techniques(Springer. Seismological Society of China, 2013-10) Gomez, Juan; Jaramillo, Juan Diego; Restrepo, Dorian; Valencia, Camilo; Juan Gomez (jgomezc1@eafit.edu.co); Mecánica AplicadaThe role played by the diffraction field on the problem of seismic site effects is studied. For that purpose we solve and analyze simple scattering problems under P and SV in-plane wave assumptions, using two well known direct boundary-element-based numerical methods. After establishing the difference between scattered and diffracted motions, and introducing the concept of artificious and physically based incoming fields, we obtain the amplitude of the Fourier spectra for the diffracted part of the response: this is achieved after establishing the connection between the spatial distribution of the transfer function over the studied simple topographies and the diffracted field. From the numerical simulations it is observed that this diffracted part of the response is responsible for the amplification of the surface ground motions due to the geometric effect. Furthermore, it is also found that the diffraction field sets in a fingerprint of the topographic effect in the total ground motions. These conclusions are further supported by observations in the time-domain in terms of snapshots of the propagation patterns over the complete computational model. In this sense the geometric singularities are clearly identified as sources of diffraction and for the considered range of dimensionless frequencies it is evident that larger amplifications are obtained for the geometries containing a larger number of diffraction sources thus resulting in a stronger topographic effect. The need for closed-form solutions of canonical problems to construct a robust analysis method based on the diffraction field is identified.Ítem ¿Cómo se mueve la Tierra cuando hay terremotos?(2012) Abad Restrepo, Ana Cristina; Jaramillo, Juan Diego; Vidal Ramírez, Alejandra; Muriel Gil, Luisa Fernanda; Uribe Dorado, Jose IgnacioÍtem Evaluación aproximada de la aceleración absoluta en sistemas de múltiples grados de libertad considerando la participación de n formas modales(2005-07-01) Jaramillo, Juan Diego; Mecánica AplicadaÍtem Identificación de propiedades dinámicas de estructuras considerando efectos de interacción suelo-estructura(2008-05-01) Jaramillo, Juan Diego; Mecánica AplicadaÍtem IE - RISS: UNA HERRAMIENTA COMPUTACIONAL PARA LA ESTIMACIÓN DE PÉRDIDAS POR SISMO EN EDIFICACIONES(UNIV NAC COLOMBIA, FAC NAC MINAS, 2012-10-01) Jaramillo, Juan Diego; Mecánica AplicadaÍtem Influence of the uncertainty in the soil-rock spectral ratios in the definition of uniform hazard spectra at surface level(IMPERIAL COLLEGE PRESS, 2006-07-01) Jaramillo, Juan Diego; Mecánica AplicadaBased on traditionally accepted hypothesis and verified by existing data, an expression is derived to calculate response spectrum at the ground surface if the response spectrum at the basement rock is known. The fundamental assumptions are with regards to the form of variation of the exceedance rates of spectral accelerations in the basement rock, and based also on the usual (lognormal) distribution forms of the uncertainties associated with the spectral amplification function. The resulting approach multiplies the mean of the amplification function in order to consider in a rigorous way its uncertainty. © Imperial College Press.Ítem Mampostería no reforzada(2007-10-01) Jaramillo, Juan Diego; Mecánica AplicadaÍtem Respuesta sísmica de muros de mampostería no reforzada sometidos a aceleraciones perpendiculares a su plano(2008-11-01) Jaramillo, Juan Diego; Mecánica AplicadaÍtem Seismic Response of Three-Dimensional Rockfill Dams Using the Indirect Boundary Element Method(IOP PUBLISHING LTD, 2010-07-01) Jaramillo, Juan Diego; GOMEZ, JUAN DAVID; Mecánica Aplicada