法国第一座仪表化建筑--格勒诺布尔市政厅的动力特性
Dynamic Behaviour of the first instrumented building in France: The Grenoble Town Hall
摘要：
法国加速度网络（RAP）于2004年11月启动了一项针对典型法国建筑物的抗震性能评估的标志性行动。该项目的主要目标是收集建筑物内的加速度数据，并利用这些数据校准用于抗震性能评估的模型或替代工具。该项目的最终目标是帮助中等地震危险国家的城市进行脆弱性评估。法国加速度网络（RAP）选择安装一个由6个加速度计组成的永久网络，连续记录格勒诺布尔市政厅地下室和顶部的振动。这座13层的建筑是一座钢筋混凝土剪力墙建筑，是法国60年代末设计的典型钢筋混凝土结构。在该建筑物内收集的所有数据均可在区域行动方案的在线访问数据库中查阅。除永久性网络外，还在整个建筑物的36个点进行了环境振动实验。使用频域分解方法，这些数据允许精确估计低振幅结构的不同振动模式。仅激励每个方向上的第一弯曲模式（1.15和1.22 Hz）和第一扭转模式（1.44 Hz）。我们比较了使用环境振动获得的频率与永久网络记录的中等地震的频率。由于连续记录，扭转模式的统计方法指出了建筑物旋转中心的位置。从环境振动中提取的模态模型，提出和验证由于在建筑物中收集的地震记录ML=4.6，2005年9月8日Vallorcine（法国上萨瓦省）地震。
英文摘要：
The French Accelerometric Network (RAP) launched in November 2004 a marked operation for the seismic behaviour assessment of a typical French building. The main goal of this project is to collect accelerometric data in the building and use them to calibrate models or alternative tools used for the seismic behaviour assessment. The final goal of this project is to help the vulnerability assessment of cities in moderate seismic hazard countries. The French Accelerometric Network (RAP) chose to install a permanent network of 6 accelerometers recording continuously the vibrations of the Grenoble City Hall at the basement and at the top. The 13-story building is a RC shear walls building, typical of the RC structures designed at the end of the 60's in France. All the data collected in the building are available on the online access database of the RAP. In addition to the permanent network, an ambient vibration experiment has been performed in 36 points of the whole building. Using the Frequency Domain Decomposition method, these data allowed estimating precisely the different modes of vibration of the structure for low amplitudes. Only the first bending modes in each direction (1.15 and 1.22 Hz) and the first torsion mode (1.44 Hz) are excited. We compared the frequencies obtained using ambient vibration to those for a moderate earthquake recorded by the permanent network. Thanks to the continuous recording, a statistical approach of the torsion mode pointed out the position of the centre of rotation of the building. A modal model extracted from ambient vibrations is proposed and validated thanks to the earthquake recordings collected in the building during the ML=4.6, September 8th 2005 Vallorcine (Haute-Savoie, France) earthquake.
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