本文给出了在地面环境随机激振下实际大型建筑物系统识别和参数识别的测量模型,分析了用输出响应自功率谱G_(yy)(f)和频率响应函数谱H_(xy)(f)间接和直接识别建筑物模态参数的情况,并用在单层工业厂房和高层建筑上所得之实际识别结果进行了论证。根据推得的位移表示频率响应函数与模态参数之间的关系式,用试验模态参数识别方法可满意地识别出高阶模态振型和精度比较高的模态阻尼等参数。 In this paper, the measurement models of system identification and parameter identification of large buildings under random excitation in the ground environment are given. The relationship between the output response G_ (yy) (f) and the frequency response function spectrum H_ (xy) (f ) Indirectly and directly identify the modal parameters of the building and demonstrate the actual recognition results obtained on single-storey industrial buildings and high-rise buildings. According to the relation between the frequency response function and the modal parameter, the displacement can be used to identify the modal parameters such as high-order modal vibration mode and high-precision modal damping with the experimental modal parameter identification method.