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汶川和玉树地震给人民的生命财产造成重大损失。震后的结构物鉴定是震后安置工作的重要内容。基于振动测试分析建筑物震后整体性能的是结构表面病害鉴定方法的必要补充。该文通过3层楼的结构模型试验研究基于最小预测误差法(PEM)的结构二阶参数识别法的表现。该系统识别方法通过将结构动力学中的状态空间模型展开为线性的ARMAX/ARMA模型,再利用PEM方法识别模型参数,可直接从结构动力响应中识别出结构质量、刚度、阻尼比等二阶参数。该方法有助于结构的重要参数鉴定,也有助于结构健康监测系统中的损伤识别。
The Wenchuan and Yushu earthquakes caused heavy losses to people’s lives and property. After the earthquake structure identification is an important part of post-earthquake resettlement work. Analyzing the overall post earthquake earthquake performance based on the vibration test is a necessary supplement to the identification of structural surface diseases. This paper studies the performance of the second-order parameter identification based on minimum prediction error (PEM) through three-layer structural model test. The system identification method can be used to identify the model parameters by expanding the state space model in the structural dynamics to a linear ARMAX / ARMA model and using the PEM method to identify the structural parameters such as structural mass, stiffness and damping ratio directly from the structural dynamic response parameter. This method contributes to the identification of important parameters of the structure and also to the damage identification in structural health monitoring system.