Influence of soil鈥搒tructure interaction (structure-to-soil relative stiffness and mass ratio) on the fundamental period of buildings: experimental observation and analytical verification

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• 作者：Wei Xiong ; Li-Zhong Jiang ; Yao-Zhuang Li
• 关键词：Dynamic soil鈥搒tructure interaction ; Fundamental period ; Experiment ; System identification
• 刊名：Bulletin of Earthquake Engineering
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：14
• 期：1
• 页码：139-160
• 全文大小：2,284 KB
• 参考文献：ASCE (2005) Minimum design loads for buildings and other structures. American Society of Civil Engineers, Reston, VA
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• 作者单位：Wei Xiong (1)
  Li-Zhong Jiang (1) (2)
  Yao-Zhuang Li (1) (2)
  
  1. School of Civil Engineering, Central South University, Changsha, 410075, Hunan, China
  2. National Engineering Laboratory of High-Rail Construction Technology, Central South University, Changsha, 410075, Hunan, China
  
• 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

In order to investigate the influence of soil鈥搒tructure interaction (SSI) on the dynamic characteristics of buildings, a series of free-vibration experiments were performed on a 1/4-scale steel-frame structure. The structural fixed-base fundamental period was for the first time determined by experiments as to avoid evaluation errors in the conventional SSI analyses, and its numerical counterpart obtained by using SAP2000庐 was also given for comparison. A total of 34 scenarios, which varied with regard to overall stiffness and mass of the structure, were examined in the experiments and the numerical simulations. In each experimental scenario, the fundamental period of the structure was determined under fixed-base and flexible-base conditions. A newly proposed method by Luco using Dunkerley鈥檚 formula to evaluate the lower bounds for structural natural frequencies considering SSI was validated by both experimental and numerical results. This method was found to exhibit excellent accuracy in predicting the fundamental period of the structure with SSI. This experimentally verified formula, having a broader application potential than the Jennings and Bielak and Veletsos and Meek expressions, could apply to a variety of researching areas in earthquake engineering and would be a useful reference for future seismic code revisions in assessing the basic period of the structure with SSI. Keywords Dynamic soil鈥搒tructure interaction Fundamental period Experiment System identification