利用ARX模型识别土-结构体系的低阶模态频率和阻尼  

Identification of first-modal frequency and damping in soil-structure interaction(SSI)system

作　　者：王满生[1] 周锡元[2] 胡聿贤[3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100032 [2]北京工业大学抗震与减灾研究所,北京100022 [3]中国地震局地球物理研究所,北京100081

出　　处：《世界地震工程》2007年第4期205-211,共7页World Earthquake Engineering

摘　　要：利用美国Alaska一14层的办公大楼及周围场地上记录到的地震动,对此结构进行了低阶模态频率和阻尼的识别,和考虑土-结构动力相互作用后的土-结体系的低阶模态的频率和阻尼的识别。提供了一种ARX参数模型辨识方法,并与非参数模型辨识比较分析,发现两种模型得到的低阶模态频率和阻尼基本一致,但在高阶模态上会出现明显的差异。通过分析还发现考虑土-结相互作用后,体系的传递函数幅值有所降低。并编制了相应的Matlab计算程序。The first-modal frequency and damping of a building are identified by using the earthquake records on the building and on related free-field in Alaska, USA. The non-parameter model and ARX parameter model of the structure are used in the identification system, and soil-structure interaction system and structure -system are both identified. By comparing the results obtained from the identification system with the results obtained from the both model is identical in low-frequencies, and but the amplitude of transfer function obtained from SSI system is smaller than from structure system itself, especially in high-frequencies. All these computations are realized on the Matlab platform.

关 键 词：土-结相互作用 低阶模态 频率 阻尼 非参数模型 参数模型 

分 类 号：P315[天文地球—地震学]