环境激励下桥梁结构模态参数识别方法的研究  

RESEARCH ON MODAL PARAMETERS IDENTIFICATION OF BRIDGE STRUCTURE UNDER AMBIENT EXCITATION

作　　者：姜浩[1,2] 郭学东[1] 杨焕龙[1] 

机构地区：[1]吉林大学交通学院,长春130025 [2]吉林建筑工程学院土木工程学院,长春130021

出　　处：《振动与冲击》2008年第11期126-128,172,共4页Journal of Vibration and Shock

基　　金：吉林省科技厅基金项目(20040511)

摘　　要：研究了在环境激励下对桥梁结构进行模态参数识别的一种时域联合算法:自然环境激励技术(NExT)和特征系统实现算法(ERA)的结合(简称NExT/ERA法)。通过对某一预应力混凝土连续梁桥结构的仿真,其中考虑了利用加速度信号、外界白噪声因素的影响,验证了方法的有效性,并指出NExT/ERA法适合于环境振动下桥梁结构的监测、诊断。The time domain united algorithms in modal parameter identification method for bridge under ambient excitation were studied,including the natural excitation technique and the eigensystem realization algorithm (NExT/ ERA).Numeric simulation of PC continuous beam bridge was carried out.During the simulation,practical influencial fac- tors such as acceleration measuring and outside white noise were taken into account.The validity of the method was veri- fied.It reveals that NExT/ERA is suitable for bridge's monitoring and diagnosis.

关 键 词：桥梁结构 模态参数识别 环境激励 自然环境激励技术 特征系统实现算法 

分 类 号：TB122[理学—工程力学] TU311.4[理学—力学]