Full-scale dynamic response of an RC building under weak seismic motions using earthquake recordings, ambient vibrations and modelling
Full-scale dynamic response of an RC building under weak seismic motions using earthquake recordings, ambient vibrations and modelling
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DOI：
10.1002/eqe.948
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发表时间：
2010-04-10
影响因子：
4.5
通讯作者：
Kotronis, Panagiotis
中科院分区：
文献类型：
--
作者：
Michel, Clotaire;Gueguen, Philippe;Kotronis, Panagiotis
在有中等地震危险的国家，为强震多发国家制定的用于估计现有建筑物的地震行为和随后的脆弱性的经典方法往往是不够的，在财政上也不现实。本文的主要目标是展示模态分析如何有助于理解地震建筑物的反应和良好的相关性的模态模型的基础上，环境振动估计结构变形下弱地震。我们描述了增强模态分析技术（频域分解）的应用，以处理在格勒诺布尔市政厅大楼（法国）拍摄的环境振动记录。环境振动的频率进行了比较与弱地震记录的法国永久性加速度网络（RAP），安装监测的建设。弱地震下的建筑物的频率变化被证明是较小的（类似于2%），因此环境振动频率是相关的弹性域的建筑物。从环境振动中提取的模态参数，然后使用确定的一维集中质量模型，以重现层间位移弱地震和固定的三维数值模型，可用于强震。数据和合成运动之间的相关系数在水平方向上分别接近80%和90%，对于1D和3D建模。版权所有（C）2009约翰威利父子有限公司
In countries with a moderate seismic hazard, the classical methods developed for strong motion prone countries to estimate the seismic behaviour and subsequent vulnerability of existing buildings are often inadequate and not financially realistic. The main goals of this paper are to show how the modal analysis can contribute to the understanding of the seismic building response and the good relevancy of a modal model based on ambient vibrations for estimating the structural deformation under weak earthquakes. We describe the application of an enhanced modal analysis technique (frequency domain decomposition) to process ambient vibration recordings taken at the Grenoble City Hall building (France). The frequencies of ambient vibrations are compared with those of weak earthquakes recorded by the French permanent accelerometric network (RAP) that was installed to monitor the building. The frequency variations of the building under weak earthquakes are shown to be less (similar to 2%) and therefore ambient vibration frequencies are relevant over the elastic domain of the building. The modal parameters extracted from ambient vibrations are then used to determine the 1D lumped-mass model in order to reproduce the inter-storey drift under weak earthquakes and to fix a 3D numerical model that could be used for strong earthquakes. The correlation coefficients between data and synthetic motion are close to 80 and 90% in horizontal directions, for the 1D and 3D modelling, respectively. Copyright (C) 2009 John Wiley & Sons, Ltd.