Sensitivity-based constitutive parameter identification of nonlinear structures with unknown input earthquake excitation

摘要：

　　System identification methods are widely used in structural health monitoring,in which the practical structure is linearized to simplify the dynamic analysis.However,the real-world civil infrastructures are generically nonlinear,especially subject to extreme loading condition like earthquake or typhoon.This paper presents an sensitivity-based method for simultaneous identification of earthquake input and system parameters for nonlinear structures.First,the nonlinear structural model based on the material constitutional law is constructed by means of fiber elements.The earthquake force are parameterized by Chebyshev orthogonal polynomials.Afterwards,the dynamic response and response sensitivities with respect to the constitutive parameters and the orthogonal factors of earthquake excitation are derived and calculated by OpenSees and Matlab.Finally,the constitutive parameters and the orthogonal factors are identified simultaneously by sensitivity-based system identification technique.A steel structure subjected to earthquake excitation is employed to verify the accuracy of the proposed method.The parameters of the steel(such as yielding stress,initial tangent stiffness)and earthquake excitation are identified by the proposed method accurately.

关键词： System identification sensitivity analysis nonlinear analysis

作者: Shun Wenga Zhidan Chena Runling Lia Jiajing Lia Hongping Zhua

作者单位: School of Civil Engineering and Mechanics,Huazhong University of Science and Technology

会议类型: 国际会议

会议名称: The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)

会议地点: 青岛

会议语种:英文

页码: 3306-3315

在线出版日期: 2018-07-22（万方平台首次上网日期，不代表论文的发表时间）