Identification of model structure parameters via combination of AFMM and ARX from seismic response data

• Published in: Earthquake Engineering and Engineering Vibration Vol. 13; no. 3; pp. 411 - 423
• Main Authors: Gong, Maosheng, Sun, Jing, Xie, Lili
• Format: Journal Article
• Language: English
• Published: Heidelberg Institute of Engineering Mechanics, China Earthquake Administration 01.09.2014; Springer Nature B.V
• Subjects: Acceleration; ARX模型; Civil Engineering; Control; Dynamical Systems; Earth and Environmental Science; Earth Sciences; Earthquakes; Geotechnical Engineering & Applied Earth Sciences; Mathematical models; Methodology; Reinforced concrete; Segments; Seismic engineering; Seismic response; Shake table tests; Simulation; Vibration; 参数辨识; 地震响应; 振动台试验; 时间变化; 结合模型; 结构参数; 钢筋混凝土框架结构; time-varying response; shaking table test; model structure; parameter identification
• ISSN: 1671-3664; 1993-503X
• DOI: 10.1007/s11803-014-0252-y

To identify the model structure parameters in shaking table tests from seismic response, especially from time- varying response records, this paper presents a new methodology by combining the online recursive Adaptive Forgetting through Multiple Models （AFMM） and offtine Auto-Regression with eXogenous variables （ARX） model. First, the AFMM is employed to detect whether the response of model structure is time-invariant or time-varying when subjected to strong motions. Second, if the response is time-invariant, the modal parameters are identified from the entire response record, such as the acceleration time-history using the ARX model. If the response is time-varying, the acceleration record is divided into three segments according to the accurate time-varying points detected by AFMM, and parameters are identified by only using the tail segment data, which is time-invariant and suited for analysis by the ARX model. Finally, the changes in dynamic properties due to various strong motions are obtained using the presented methodology. The feasibility and advantages of the method are demonstrated by identifying the modal parameters of a 12-story reinforced concrete （RC） frame structure in a shaking table test.