基于绝对加速度观测量的地震动时程及结构参数识别研究  

Identification of ground motion time history and structural parameters based on absolute acceleration observations

作　　者：贺佳[1,2] 李静贤 张肖雄 HE Jia;LI Jingxian;ZHANG Xiaoxiong(College of Civil Engineering,Hunan University,Changsha 410000,China;Key Laboratory of Wind and Bridge Engineering of Hunan Province,Changsha 410000,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410000 [2]风工程与桥梁工程湖南省重点实验室,湖南长沙410000

出　　处：《地震工程与工程振动》2024年第5期118-124,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点研发计划课题(2022YFC3005305)。

摘　　要：针对未知地震作用下框架结构的参数识别问题,提出了一种基于扩展卡尔曼滤波(extended Kalman filter,EKF)的地震动时程反演与结构参数识别方法。首先,将首层底板的层间边界力视作未知外激力,利用未知激力下的EKF算法识别此未知激励以及其余层的剪切刚度;其次,采用傅里叶变换,从绝对加速度时程中获取结构基频,进而根据特征方程识别首层刚度系数;最后,基于识别的结构参数,进一步修正未知边界力,并结合Newmark-β法反演地震加速度时程。文中通过5层框架模型数值算例和振动台试验验证了本文算法的有效性。In this study,based on the extended Kalman filter(EKF),an approach is proposed for identifying unknown ground motion time history and structural parameters by using the absolute acceleration measurements.First,the interfacial force of the lower boundary of the 1st floor is considered as the unknown excitation.The EKF-based approach is employed for the identification of this unknown excitation and the remaining structural stiffness parameters.Then,by using Fourier transform,the structural natural frequencies can be obtained from the acceleration measurements and used for identifying structural stiffness of the 1st floor.Finally,based on these identified structural parameters,the unknown interfacial force mentioned above is updated and employed for identifying ground acceleration with the aid of Newmark-βmethod.The effectiveness of the proposed approach is validated via a numerical frame structure and a five-story experimental model under shaking table tests.

关 键 词：地震动时程反演 结构参数识别 扩展卡尔曼滤波 绝对加速度观测量 

分 类 号：TU311.3[建筑科学—结构工程] TB122[理学—工程力学]