Characteristic analysis of ground motions of a canyon topography under obliquely incident SV waves

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (20) : 237-243.

SUN Weiyu1,2，WANG Jinghe1,2，YAN Songhong1,3，OU Erfeng1,2，LIANG Qingguo1,2

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Abstract

Based on the input method of the visco-elastic artificial boundary combined with the equivalent load, the ground motion input of the obliquely incident SV waves was realized.The effects of the incident angles of the SV waves and the canyon slope angles on the ground motion amplification coefficient distribution characteristics were studied.It shows that: with the incident angle and slope angle increase, the ground motion amplification coefficient of the slope surface and a certain range of slope crest are increased, and the impact width of the slope top is also larger; when the seismic wave is incident at left, the ground motion amplification coefficient distribution is asymmetry on both sides of the canyon, x component of canyon left bank and z component of canyon right are greater with the incident angle, the greater of incident angle, the more obvious of asymmetry; the ground motion amplification coefficient of slope top and impact width of the slope top are increased linearly with the slope angle in different incident angles; the more incident angle and slope angle, the greater of slope top acceleration response spectrum of x component and the peak has a tendency shift to the right.
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Key words

canyon topography / visco-elastic artificial boundary / SV wave / obliquely incident / amplification coefficient

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SUN Weiyu1,2，WANG Jinghe1,2，YAN Songhong1,3，OU Erfeng1,2，LIANG Qingguo1,2. Characteristic analysis of ground motions of a canyon topography under obliquely incident SV waves[J]. Journal of Vibration and Shock, 2019, 38(20): 237-243

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