Effect of a single vibrating building on free-field ground motion: numerical and experimental evidences
Effect of a single vibrating building on free-field ground motion: numerical and experimental evidences
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单个振动建筑物对自由场地震动的影响：数值和实验证据
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
F. Ponzo
中科院分区：
文献类型：
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作者：
R. Ditommaso;M. Mucciarelli;M. Gallipoli;F. Ponzo
建筑物振动对自由场地震动的影响会影响建筑物内部或附近采集的地震记录。一些证据是已知的大型结构，但也有小型建筑物可能会对录音质量产生不利影响。给出了一个例子，意大利加速度网络的一个站，其记录显示了主机建筑物的频率的明确标记。为了以更普遍的方式解决这个问题，我们进行了数值模拟，其第一个目的是验证来自测试站点的现有经验证据。加利波利等人(Bull Seismol Soc Am 96：2457-2464，2006）监测了在2层R.C.在Bagnoli（意大利）的一个建筑物中，显示单个振动的建筑物可能影响“自由场”运动，其影响达到峰值地面加速度的20%。我们重新分析了该实验的数据后，Safak（土壤动力学地球工程17：509-517，1998）的方法，以建筑物土壤运动，描述为向上和向下传播的S波的传播。数值模型是一个单自由度的振荡器链，其动态行为取决于质量，刚度和阻尼。合成数据和真实的数据之间的一致性鼓励我们使用这个模型来再现具有单自由度的系统的广义结构。我们运行多个测试不同的距离，建筑物和车站之间，和建筑物-土壤耦合，获得一个统计分布的影响，一个单一的振动建筑物的自由场地面运动考虑到距离。
The influence of vibrating buildings on the free-field ground motion could affect the earthquake recordings collected inside or nearby the buildings. Some evidences are known for large structures, but also small buildings could adversely affect the quality of the recordings. An example is given for a station of the Italian Accelerometric Network whose recordings show a clear mark of the frequency of the host building. To tackle this problem in a more general way, we performed numerical simulations whose first aim was to validate existing empirical evidence from a test site. Gallipoli et al. (Bull Seismol Soc Am 96:2457–2464, 2006) monitored a release test on a 2-storey R.C. building in Bagnoli (Italy), showing that a single vibrating building may affect the “free-field” motion with an influence that reaches 20% of peak ground acceleration. We re-analysed the data of that experiment following the Safak (Soil Dyn Earthq Eng 17:509–517, 1998) approach to building-soil motion, described as propagation of up- and down-going S-waves. The numerical model is a chain of single degree of freedom oscillators, whose dynamic behaviour depends on mass, stiffness and damping. The agreement between the synthetic and real data encouraged us to use this model to reproduce generalised structures as systems with a single degree of freedom. We run multiple tests varying the distance, between building and station, and the building-soil coupling, obtaining a statistical distribution of the influence of a single vibrating building on free-field ground motion taking into account the distance.