Seismic ground motion of a canyon topography under left inclined incident P and SV waves is analyzed using numerical simulation method, and effects of the incident angleθ and the aspect ratio (ratio of the canyon depth and width) on the ground motion amplification factor β of the surface are also discussed. It is showed that: (1) The influence degree and range of theβare strongly related to the incident waves. (2) βof the canyon's side are generally larger than the bottom, andβof the side corner is larger than the top surface. (3) For fixed aspect ratio and SV wave incidence, the amplification factor increases with the increase of incident angle, and β of the x component is greater than the z component. Besides, β of left side corner is larger than the right. For P wave incidence, βof the x component is less than 2, and β is also increases with the incident angle. The z component amplification factors at the two side corners of the canyon exceed 2, and β decreases with the increase of θ. (4) For fixed θ, no matter of SV and P wave incidence, β of the canyon's two sides increases with the increase of aspect ratio. For SV wave incidence, β of the x component at the left side corner is greater than the right ones, and β of the z component is less than the x. For P wave incidence, β of the x component at the left side corner is also greater than the right ones, withβ at any positions less than 2, andβ of the z component is larger than the x component.
Key words
canyon topography /
inclined P and SV wave /
ground motion /
amplification factor
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References
[1] 胡聿贤, 孙平善, 章在墉等. 场地条件对震害与地震动的影响[J] . 地震工程与工程振动, 1980( 试刊) .
HU Yu-xian, SUN Ping-shan, ZHANG Zai-yong, et al. Effect of site conditions on earthquake damage and ground motion[J]. Journal of Earthquake Engineering and Engineering Vibration, 1980.
[2] 杜修力，韩强，李忠献等. "5• 12" 汶川地震中山公路桥梁震害及启示[J] .北京工业大学学报, 2008,34(12):1270 -1279.
DU Xiu-li，HAN Qiang, LI Zhong-xian, et al. The seismic damage of bridge in the 2008 Wenchuan Earthguake and lessons from its damage[J] .Journal of Beijing University of Technology, 2008, 34(12):1207 -1279.
[3] Trifunac M D. Scattering of plane SH-waves by a semi- cylindrical canyon[J]. Earthquake Engineering and Structure Dynamics. 1973, 1: 267-281.
[4] Wong H L. and Trifunac M D. Scattering of plane SH-waves by a semi-elliptical canyon[J]. Earthquake Engineering and Structure Dynamics,1974, 3: 57-169.
[5] Cao H. and Lee V W. Scattering of plane SH-waves by circular cylindrical canyons with variable depth-to-width ratio[J]. European Earthquake Engineering, 1989,2: 29-37.
[6] Lee V W, Cao H. Diffraction of SV waves by circular cylindrical canyon of various depths [J]. Journal of Engineering Mechanics, ASCE, 1989, 115:2035-2056
[7] 钟慧，张郁山.圆弧状凹陷地形对平面SV波散射问题的宽频带解析解[J]，中国地震，2010, 26(2)：142-155.
ZHONG Hui, ZHANG Yu-shan. Broad-frequency-band analytical solution to scattering of plane SV wave by arc-shaped canyon topography[J]. Earthquake Research in China, 2010, 26(2)：142-155.
[8] 梁建文, 严林隽，Vincent W Lee. 圆弧形凹陷地形表面覆盖层对入射平面SV波的影响[J]. 地震学报, 2001, 23(6): 622-636.
[9] Lee V W, Sabban M S, Ghosh T. 3-D surface motion of long semi-circular longitudinal canyons: incident plane P waves[J]. European Journal of Earthquake Engineering, 1996, 9(3): 12–22.
[10] 梁建文, 严林隽. 圆弧形凹陷地形表面覆盖层对入射平面P波的影响[J]. 固体力学学报, 2002, 23(1):126–132.
LIANG Jian-wen, YAN Lin-jun, Response of circular-arc alluvial valleys under incident P wave [J]. Acta Mechanica Solida Sinica, 2002, 23(1): 126–132.
[11] 周国良，李小军，侯春林等.SV波入射下河谷地形地震动分布特征分析[J]. 岩土力学, 2012, 33(4): 1161–1166.
ZHOU Guo-liang，LI Xiao-jun，HOU Chun-lin, et al. Characteristic analysis of ground motions of canyon topography under incident SV seismic waves[J].Rock and Soil Mechanics, 2012, 33(4): 1161–1166.
[12] 盛志强，卢育霞，石玉成等. 河谷地形的地震反应分析[J], 地震工程与工程振动，2013, 35(1):126-132.
SHENG Zhi-qiang, LU Yu-xia, SHI Yu-cheng, et al. Seismic response analysis of valley topograph [J]. Earthquane Engineering and Engineeting Vibration, 2013, 35(1):126-132.
[13] 谢和平，台佳佳，邓建辉等. 虹口高原大桥的破坏机制分析.四川大学学报(工程科学版)，2009,41(3):51-55.
XIE He-ping, TAI Jia-jia, DENG Jian-hui, et al. Analysis of damage mechanism of Gaoyuan bridge in Hongkou[J]. Journal of Sichuan University(Engineering Science Edition), 2009,41(3):51-55.
[14] 周国良，李小军，李铁萍等. SV波入射下峡谷地形对多支撑大跨桥梁地震反应影响分析[J]. 岩土力学, 2012, 33(5): 1572–1578.
ZHOU Guo-liang, LI Xiao-jun, Li Tie-ping, et al. Canyon topography effects on seismic responses of multi-support bridge under incident SV seismic waves[J]. Rock and Soil Mechanics, 2012, 33(5): 1572–1578.
[15] 谷音，江梦霞，卓卫东等. 考虑地震波斜入射下河谷地形的大跨桥梁动力反应研究[J]. 福州大学学报(自然科学版).2013, 41(4): 517-522.
GU Yin，JIANG Meng-xia，ZHUO Wei-dong, et al. Seismic response analysis of long-span bridges subjected to spatially non-uniform seismic ground motions[J]. Journal of Fuzhou University (Natural Science Edition), 2013, 41(4): 517-522.
[16] 廖振鹏著，工程波动理论导论[M]. 科学出版社，2002
[17] 孔戈，丁海平，金星等.多次透射边界在ANSYS软件中应用[J]. 工程抗震与加固改造,2005,27(2):67-70.
KONG Ge, DING Hai-ping, JIN Xing, et al. The application of multi- transmitting boundary in ANSYS[J]. Earthquake Resistant Engineering and Retrofitting, 2005,27(2): 67-70.
[18] 傅淑芳，刘宝成. 地震学教程[M]. 北京：地震出版社，1991.
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