利用ARX模型识别土-结构体系的低阶模态频率和阻尼

英文篇名：Identification of first-modal frequency and damping in soil-structure interaction(SSI)system
中文刊名：世界地震工程
英文刊名：World Earthquake Engineering
作者：王满生 ; 周锡元 ; 胡聿贤
英文作者：WANG Man-sheng1 ; 3 ZHOU Xi-yuan2 HU Xu-xian3(1. School of Civil & Environment Engineering ; Beijing University of Science and Technology ; Beijing 100032 ; China ; 2.College of Architectural Engineering ; Bejing University of Technology ; Beijing 100022 ; China ; 3.Institute of Geophysics ; C E A ; Beijing 100081 ; China)
中文关键词：土-结相互作用 ; 低阶模态 ; 频率 ; 阻尼 ; 非参数模型 ; 参数模型
英文关键词：soil-structure interaction ; first-modal ; frequency ; damping ; non-parameters model ; parameters model
出版日期：2007-12-15
机构：北京科技大学土木与环境工程学院,北京工业大学抗震与减灾研究所,中国地震局地球物理研究所北京100032,中国地震局地球物理研究所,北京100081,北京100022,北京100081
年：2007
期：04
出版单位：世界地震工程

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.

引文

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