Scattering problems of the SH Wave by Using the Null-Field Boundary Integral Equation Method |
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| Authors: | Jeng-Tzong Chen Shing-Kai Kao Yin-Hsiang Hsu Yu Fan |
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| Institution: | 1. Department of Harbor and River Engineering and Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan;2. Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung, Taiwan |
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| Abstract: | The scattering problem of seismic waves is an important issue for studying earthquake engineering. In this paper, the null-field boundary integral equation approach was used in conjunction with degenerate kernels and eigenfunction expansion to solve the SH-wave scattering problem of a circular or an elliptical-arc hill. The original problem is divided into subdomains by taking a free-body diagram. One region is an interior boundary value problem. The other is a canyon scattering problem. For the boundary value problem, not only a simply connected domain (elliptical-arc hill problem) but also a doubly connected domain (a circular-arc hill problem containing a circular tunnel or a circular inclusion) is considered. The canyon scattering problem may be addressed in an infinite domain with an artificial boundary of a full plane such that the degenerate kernel can be fully utilized. The null-field integral equation method is used to match boundary conditions. Numerical results are compared favorably with the available data. |
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| Keywords: | SH-wave Diffraction Hill Tunnel Null-field BIEM Degenerate kernel |
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