Amplification Pattern of Orthotropic Gaussian-Shaped Valley

Authors

1 Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran

2 Department of civil engineering, Islamic Azad University, Zanjan, Iran

3 Geotechnical Engineering Research Center, International Institute of Earthquake Engineering and Seismology, Tehran, Iran

10.22034/ceej.2024.59064.2296

Abstract

In this paper, the seismic response of an orthotropic Gaussian-shaped valley exposed to incident SH-waves is presented. The time-domain orthotropic half-space boundary element method, previously proposed by the authors for analyzing the aforementioned problem, is employed. Material damping is applied indirectly using logarithmic functions in the formulation. Additionally, the results are validated through a convergence approach for a circular valley, assuming certain key model parameters, such as isotropy factor, valley aspect ratio, and frequency content. The seismic amplification patterns of the ground surface are sensitively investigated in both time and frequency domains. The obtained responses are primarily presented as two/three-dimensional graphs in both the time and frequency domains. The results indicated that the material properties of the valley and the orientation of geological formations significantly affect the seismic amplification pattern of the ground surface. Moreover, the maximum valley amplification of 2.14 occurred for periods less than 0.5 and the assumed maximum isotropy factor.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 15 June 2024

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