DOI: 10.1007/s11069-021-04543-w
论文题名: Site response analysis for deep and soft sedimentary deposits of Dhaka City, Bangladesh
作者: Rahman M.Z. ; Siddiqua S. ; Kamal A.S.M.M.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2021
卷: 106, 期: 3 起始页码: 2279
结束页码: 2305
语种: 英语
中文关键词: Ground motion
; Response analysis
; Response spectra
; Shear wave velocity
; Site coefficient
; Site effect
英文关键词: bedrock
; earthquake intensity
; ground motion
; response analysis
; S-wave
; site effect
; spectral analysis
; wave propagation
; wave velocity
; Bangladesh
; Dhaka [Bangladesh]
; Dhaka [Dhaka (ADS)]
英文摘要: The ground motion intensity of an earthquake is significantly changed when seismic waves propagate from the bedrock to the near-surface soft geological materials. The ground where the shear wave velocity (Vs) exists greater than 760 m/s is generally considered as bedrock. As a common practice in the last three decades, the surface ground motion of a soil site is estimated by multiplying the bedrock motion with the site coefficient that is empirically determined from the time-averaged shear wave velocity in the top 30 m (Vs30) of the site. The site coefficient is defined as the ratio of the ground motion intensity at the ground surface to that of the bedrock. If the bedrock of a site exists at a depth of greater than 30 m, the site effect from the depth of 30 m to the bedrock is not accounted in the Vs30-based site coefficient. In Dhaka City, the minimum depth of the bedrock is approximately 175 m. Therefore, the use of the Vs30-based site coefficient to estimate the surface ground motion is not appropriate for the soft and deep sedimentary deposits of this city. In this study, site response analysis using the Vs30-based site coefficient, linear, equivalent-linear, and nonlinear approaches has been performed to estimate the surface ground motion at different sites of Dhaka City and to compare the results of different approaches. It is observed that the surface ground motion is decreased with increasing the depth of the bedrock due to low shear strain and viscous damping in the soft sedimentary deposits. © 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169315
Appears in Collections: 气候变化与战略
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作者单位: Department of Disaster Science and Management, University of Dhaka, Dhaka, 1000, Bangladesh; School of Engineering, The University of British Columbia, Okanagan Campus, Kelowna, BC V1V 1V7, Canada
Recommended Citation:
Rahman M.Z.,Siddiqua S.,Kamal A.S.M.M.. Site response analysis for deep and soft sedimentary deposits of Dhaka City, Bangladesh[J]. Natural Hazards,2021-01-01,106(3)