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Dynamic behavior of double and triple adjacent 2D hills using boundary element method.
Mobin Afzalirad1, Mehran Naghizadehrokni2, Iman Khosravi3
1Civil Engineering Department, Islamic Azad University, Iran.
Heliyon
|February 2, 2019
Summary
This study developed a 2D boundary element method to analyze seismic responses of hills with material damping. Adjacent hills showed higher amplification than single hills, with multiplicity affecting frequency characteristics.
Area of Science:
- Geotechnical Engineering
- Computational Mechanics
- Seismology
Background:
- Seismic site response analysis is crucial for infrastructure safety.
- Understanding the influence of topography and material damping on seismic wave propagation is essential.
Purpose of the Study:
- To develop and apply a 2D boundary element method (BEM) for seismic investigation of complex hill configurations.
- To analyze the seismic response of double and triple semi-sine hills subjected to P and SV waves, considering material damping.
Main Methods:
- Developed a 2D boundary element algorithm incorporating time-convoluted kernels for proportional damping.
- Utilized the viscoelastic boundary element algorithm to simulate seismic wave interaction with semi-sine hills.
- Presented results using graphs, amplification plots, and displacement analyses.
Main Results:
- Crests of homogeneous adjacent hills exhibited higher maximum amplification compared to single hills.
- Increasing the shape ratio amplified the difference, but it remained negligible within studied proportions.
- Multiple hills increased the frequency characteristics, leading to more peaks and valleys in the amplification curve.
Conclusions:
- The developed 2D BEM effectively simulates seismic response considering material damping.
- Topography, specifically the multiplicity and shape of hills, significantly influences seismic amplification patterns.
- Adjacent hills demonstrate a greater potential for seismic amplification than isolated ones.
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