Seismic response of Beirut (Lebanon) buildings: instrumental results from ambient vibrations

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• 作者：Christelle Salameh ; Bertrand Guillier ; Jacques Harb…
• 关键词：Lebanon ; Beirut ; RC buildings ; Ambient vibration ; Dynamic parameters ; Soil type ; Fundamental period/frequency ; Damping ; Seismic code
• 刊名：Bulletin of Earthquake Engineering
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：14
• 期：10
• 页码：2705-2730
• 全文大小：2,968 KB
• 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
• 卷排序：14

文摘

Resonance period is a key parameter in the seismic design of a structure, thus dynamic parameters of buildings in Beirut (Lebanon) were investigated based on ambient vibration method for risk and vulnerability assessment. Lebanon is facing high seismic hazard due to its major faults, combined to a high seismic risk caused by dense urbanization in addition to the lack of a seismic design code implementation. For this study, ambient vibration recordings have been performed on 330 RC buildings, period parameters extracted and statistically analyzed to identify correlations with physical building parameters (height, horizontal dimensions, age) and site characteristics (rock sites or soft sites). The study shows that (1) the building height or number of floors (N) is the primary statistically robust parameter for the estimation of the fundamental period T; (2) the correlation between T and N is linear and site dependent: T ≈ N/23 for rock sites and N/18 for soft sites; (3) the measured damping is inversely proportional to the period: the taller the building the lower is the damping; (4) a significant overestimation of the period exists in current building codes. However part of the large discrepancy with building code recommendations may be due to the very low level of loading.