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Título del libro: Proceedings Of The International Conference On Soil Mechanics And Foundation Engineering
Título del capítulo: Seismic response of three-dimensional alluvial valleys

Autores UNAM:
LUIS EDUARDO PEREZ ROCHA; FRANCISCO JOSE SANCHEZ SESMA;
Autores externos:

Idioma:
Inglés
Año de publicación:
1989
Palabras clave:

Earthquakes - Analysis; Mathematical Techniques - Boundary Element Method; Soils - Earthquake Effects; Alluvial Valley; Navier Equation; Soil Mechanics


Resumen:

A boundary method is applied to study the seismic response of three-dimensional alluvial valleys on the surface of an elastic half-space. The excitation is given by incidence of plane waves. The method makes use of wave function families which are solutions of the Navier equation. The refracted and scattered displacement fields are constructed with wave function linear forms. Coefficients are obtained from a least-squares point matching of boundary conditions. Axial symmetry of the valleys allows the use of an azimuthal decomposition, and the solution of the problem is feasible through superposition of several two-dimensional solutions. Results are presented for incidence of SH and Rayleigh waves in time domain. Large amplifications and spatial variation of ground motion are found in both cases, clearly indicating the significance of the phenomenon in earthquake analyses.


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