Seismic Response of Transamerica Building. II: System Identification
Seismic Response of Transamerica Building. II: System Identification
复制标题
泛美大厦的地震响应。
DOI：
10.1061/(asce)0733-9445(1991)117:8(2405
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
M. Çelebi
中科院分区：
文献类型：
--
作者：
E. Şafak;M. Çelebi
详细分析了1989年10月17日洛马普列塔地震期间泛美大厦的地震反应记录。用于分析的系统识别算法基于最小二乘逼近的离散时间线性滤波方法，并假设建筑物为多输入、单输出模型。从记录中识别出15个南北方向的模态和18个东西方向的模态。分析表明，该建筑物的地震反应是由一个耦合振动模式的0.28赫兹在西南-东北方向，这是几乎平行于建筑物的正方形横截面的对角线之一。这种行为的原因是建筑物的结构特征的对称性，以及地震的\IS\N波的强烈极化。在地震的强烈运动部分，建筑物的几个较高的模式被激发。结果还显示，在2.15 Hz的频率下，建筑物中存在显著的摇摆量。
A detailed analysis of the recorded seismic response of the Transamerica Building during the October 17, 1989 Loma Prieta earthquake is presented. The system identification algorithm used for the analysis is based on the discrete-time linear filtering approach with least-squares approximation, and assumes a multi-input, single-output model for the building. Fifteen modes in the north-south direction, and 18 modes in the east-west direction are identified from the records. The analysis shows that the building’s response to the earthquake was dominated by a coupled mode of vibration of 0.28 Hz in the southwest-northeast direction, which is almost parallel to one of the diagonals in the building’s square cross section. The reason for this behavior is the symmetry of the building’s structural characteristics, as well as the strong polarization of the \IS\N-waves of the earthquake. Several higher modes of the building were excited during the strong-motion part of the earthquake. The results also show a significant amount of rocking in the building at a frequenty of 2.15 Hz.