基于多维ARX模型理论识别脉动风激励下穹顶结构模态的研究

环境激励下大型土木工程结构的实测工作对于新型结构的理论研究和设计分析具有重要意义.从状态空间理论出发,建立多维ARX模型,推得了结构的模态参数.在脉动风的作用下,对穹顶结构进行脉动法实测,将实测值与有限元分析结果进行比较.结果表明,多维ARX模型用于大型土木工程结构的模态参数在线识别是可行的.

Research of Dome Structure Modal Identification under Pulsating Wind Based on Theory of Multiple ARX Model

The dynamic behavior measurement of the large civil engineering structures under the random excitation is important to theoretical research and structure design of new type structures.A multiple ARX model has been set up based on the state space theory.The modal parameters of the structure are obtained.The pulsating method is used to test the dome structure of the building under pulsation wind.Measured experimental data are compared with those obtained from the finite element analysis.The result shows that the multiple ARX model is suitable for modal identification of the large civil engineering structures on line.