基于强震观测和ARMAV模型的混凝土坝模态识别
发布时间：2019-02-28 07:47
【摘要】：采用混凝土坝的实测振动响应识别结构模态参数是进行结构动力特性研究的一种可行的方式。基于混凝土坝的强震观测数据,提出采用矢量自回归滑动平均模型(Auto-Regressive Moving Average Vector,ARMAV)和稳态图法来进行混凝土坝结构模态参数识别。研究了结构实测振动响应时间序列的ARMAV模型表达形式,并通过引入辅助变量(Instrumental Variable,IV)技术,来求解模型中的未知系数;通过研究ARMAV模型系数矩阵与结构系统矩阵的关系,以便为结构模态识别提供理论依据;根据综合了各测点观测信息的平均标准化功率谱(Average Normalized Power Spectrum Density,ANPSD)来对传统的稳态图法进行改进,以实现强震激励下混凝土坝的系统定阶和虚假模态剔除。通过一个数值算例和一个工程实例,验证了提出的基于强震观测和ARMAV模型的结构模态参数识别方法的精度、有效性和工程适用性。
[Abstract]:It is a feasible way to study the dynamic characteristics of concrete dam by using the measured vibration response to identify the modal parameters of the structure. Based on the strong earthquake observation data of concrete dam, the vector autoregressive moving average model (Auto-Regressive Moving Average Vector,ARMAV) and steady-state diagram method are used to identify the modal parameters of concrete dam structure. The expression form of ARMAV model for the measured vibration response time series of structures is studied, and the unknown coefficients in the model are solved by introducing auxiliary variable (Instrumental Variable,IV) technique. The relationship between the coefficient matrix of ARMAV model and the matrix of structural system is studied in order to provide a theoretical basis for modal identification of structures. According to the average standardized power spectrum (Average Normalized Power Spectrum Density,ANPSD), the traditional steady-state diagram method is improved to realize the systematic determination of order and elimination of false modes of concrete dam under strong earthquake excitation. Through a numerical example and an engineering example, the accuracy, effectiveness and engineering applicability of the proposed modal parameter identification method based on strong earthquake observation and ARMAV model are verified.
【作者单位】： 西安理工大学西北旱区生态水利工程国家重点实验室培育基地;河海大学水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51409205) 博士后自然科学基金项目(2015M572656XB) 陕西省重点科技创新团队(2013KCT-015) 水文水资源与水利工程科学国家重点实验室开放研究基金(2014491011)
【分类号】：TV642;TV312
本文编号：2431632
[Abstract]:It is a feasible way to study the dynamic characteristics of concrete dam by using the measured vibration response to identify the modal parameters of the structure. Based on the strong earthquake observation data of concrete dam, the vector autoregressive moving average model (Auto-Regressive Moving Average Vector,ARMAV) and steady-state diagram method are used to identify the modal parameters of concrete dam structure. The expression form of ARMAV model for the measured vibration response time series of structures is studied, and the unknown coefficients in the model are solved by introducing auxiliary variable (Instrumental Variable,IV) technique. The relationship between the coefficient matrix of ARMAV model and the matrix of structural system is studied in order to provide a theoretical basis for modal identification of structures. According to the average standardized power spectrum (Average Normalized Power Spectrum Density,ANPSD), the traditional steady-state diagram method is improved to realize the systematic determination of order and elimination of false modes of concrete dam under strong earthquake excitation. Through a numerical example and an engineering example, the accuracy, effectiveness and engineering applicability of the proposed modal parameter identification method based on strong earthquake observation and ARMAV model are verified.
【作者单位】： 西安理工大学西北旱区生态水利工程国家重点实验室培育基地;河海大学水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51409205) 博士后自然科学基金项目(2015M572656XB) 陕西省重点科技创新团队(2013KCT-015) 水文水资源与水利工程科学国家重点实验室开放研究基金(2014491011)
【分类号】：TV642;TV312
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