Investigation of Incidence Angle Effects on 2-D Soil Amplification of Bedrock Seismic Motions Using a Discrete Time Approach

Abstract eng:
The problem of seismic soil amplification is of particular importance in relation to the assessment of local soil condition effects on seismic motions characteristics in soil deposits. Most of the practical studies have been limited to 1-D amplification of vertically propagating SH-waves considering essentially the problem in the frequency domain. In this paper, the approach is extended to an investigation of the effects of incident angles on 2-D amplification of obliquely propagating shear waves based on a discrete–time wave propagation formulation. Simple analytical models of seismic site amplification with respect to bedrock for obliquely propagating shear waves in both elastic and viscoelastic soil deposits overlying bedrock are derived. Emphasis is placed on the significance of incidence angle effects on seismic site amplification, considering different values of rock – soil impedance ratios. Sensitivity analyses are performed utilizing the soil profile model of the site of El–Asnam Cultural Center, in the El–Chellif region (NorthWestern Algeria) formulated on the basis of field test and laboratory investigations. Numerical results are discussed in terms of site amplification functions, spectral peak ratios and simulated surface acceleration time histories at the studied site.

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