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通过对一个现有建筑的结构动态参数的辨识讨论了土与结构的相互作用。目标建筑是建于1998年的8层的型钢混凝土结构。在此研究中,8自由度的模型被建立以分析微震观测数据,随即,非参数和参数技巧以辨识此结构的自然频率,阻尼率和层硬度等。在考虑土-结构相互作用和不考虑土-结构相互作用的两种情况下,分别辨识结构的参数并对比结果以证实其对辨识结果的影响。在文中非参数方法包括众所周知的传递函数和随机减量法,参数方法是非线性的系统辨识工具ARX(Auto-Regression with extra input)方法。
The interaction between soil and structure is discussed through the identification of structural dynamic parameters of an existing building. The target building is an 8-story steel-reinforced concrete structure built in 1998. In this study, a model of 8 degrees of freedom was built to analyze microseismic observations, followed by nonparametric and parametric techniques to identify the natural frequency, damping rate, and layer stiffness of the structure. In both cases, considering the soil-structure interaction and not considering the soil-structure interaction, the parameters of the structure are respectively identified and compared to confirm their influence on the identification result. In this paper, the nonparametric method includes the well-known transfer function and random decrement method. The parametric method is a non-linear ARX (Auto-Regression with extra input) method.