دورية أكاديمية
Viaduct seismic response under spatial variable ground motion considering site conditions
| العنوان: | Viaduct seismic response under spatial variable ground motion considering site conditions |
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| المؤلفون: | Derbal, Rachid, Benmansour, Nassima, Djafour, Mustapha, Matallah, Mohammed, Ivorra, Salvador |
| المساهمون: | Universidad de Alicante. Departamento de Ingeniería Civil, Grupo de Ensayo, Simulación y Modelización de Estructuras (GRESMES) |
| بيانات النشر: | Techno-Press |
| سنة النشر: | 2019 |
| المجموعة: | RUA - Repositorio Institucional de la Universidad de Alicante |
| مصطلحات موضوعية: | Ground motion, Spatial variability, Simulation, Wave propagation, Coherency loss, Local geological site effect, Mecánica de Medios Continuos y Teoría de Estructuras |
| الوصف: | The evaluation of the seismic hazard for a given site is to estimate the seismic ground motion at the surface. This is the result of the combination of the action of the seismic source, which generates seismic waves, the propagation of these waves between the source and the site, and site local conditions. The aim of this work is to evaluate the sensitivity of dynamic response of extended structures to spatial variable ground motions (SVGM). All factors of spatial variability of ground motion are considered, especially local site effect. In this paper, a method is presented to simulate spatially varying earthquake ground motions. The scheme for generating spatially varying ground motions is established for spatial locations on the ground surface with varying site conditions. In this proposed method, two steps are necessary. Firstly, the base rock motions are assumed to have the same intensity and are modelled with a filtered Tajimi-Kanai power spectral density function. An empirical coherency loss model is used to define spatial variable seismic ground motions at the base rock. In the second step, power spectral density function of ground motion on surface is derived by considering site amplification effect based on the one dimensional seismic wave propagation theory. Several dynamics analysis of a curved viaduct to various cases of spatially varying seismic ground motions are performed. For comparison, responses to uniform ground motion, to spatial ground motions without considering local site effect, to spatial ground motions with considering coherency loss, phase delay and local site effects are also calculated. The results showed that the generated seismic signals are strongly conditioned by the local site effect. In the same sense, the dynamic response of the viaduct is very sensitive of the variation of local geological conditions of the site. The effect of neglecting local site effect in dynamic analysis gives rise to a significant underestimation of the seismic demand of the structure. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://doi.org/10.12989/eas.2019.17.6.557Test; Earthquakes and Structures. 2019, 17(6): 557-566. doi:10.12989/eas.2019.17.6.557; 2092-7614 (Print); 2092-7622 (Online); http://hdl.handle.net/10045/100757Test; A10228017 |
| DOI: | 10.12989/eas.2019.17.6.557 |
| الإتاحة: | https://doi.org/10.12989/eas.2019.17.6.557Test http://hdl.handle.net/10045/100757Test |
| حقوق: | © 2019 Techno-Press, Ltd. ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.6DCEB984 |
| قاعدة البيانات: | BASE |
| DOI: | 10.12989/eas.2019.17.6.557 |
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