Response of sedimentary basin to obliquely incident SH waves

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• 作者：Chuanbin Zhu ; David P. Thambiratnam ; Jian Zhang
• 关键词：Incident angle ; Sedimentary basin ; Seismic response ; SH waves
• 刊名：Bulletin of Earthquake Engineering
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：14
• 期：3
• 页码：647-671
• 全文大小：2,595 KB
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• 作者单位：Chuanbin Zhu (1)
  David P. Thambiratnam (1)
  Jian Zhang (1)
  
  1. Civil Engineering and Built Environment School, Queensland University of Technology, Brisbane, 4000, Australia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Civil Engineering
  Geophysics and Geodesy
  Hydrogeology
  Structural Geology
  
• 出版者：Springer Netherlands
• ISSN：1573-1456

文摘

This research studies the impact of the incident angle of SH waves on the seismic response of two-dimensional sedimentary basins by using a nonlinear method. At first Ricker wavelet is input for a detailed analysis, followed by a statistical analysis based on a total of 100 real earthquake motions recorded at rock sites. The results show that the incident angle has a significant implication on the basin ground motion. First, the incident angle affects the short-period components more than the long-period ones of the spectral response acceleration, but the dominant period of the spectral response acceleration is insensitive to incident angle and location. Second, the MDIA of a basin is not necessarily 0° (vertical incidence) but in the range of approximately 0°–30°, and hence due attention should be paid to the influence of incident angle in seismic response analysis. Third, basin central areas are seismically preferable to edge regions for short-period buildings located on the basin, while, for long-period buildings, the edge areas become preferable. However, with the increase in incident angle, the difference between edge and central areas diminishes gradually. Finally, given that the dimensions of a basin are perceivable to incidence waves, the slope angle has a considerable impact on the PGA distribution pattern by controlling whether or not peak appears in the edge area. The MDP is most likely to be in the edge area of a basin with small slope angle when subjected to excitation with small incident angle (including vertical incidence). Keywords Incident angle Sedimentary basin Seismic response SH waves