环境激励下框架结构体系的模态识别方法研究  

STUDY ON MODAL IDENTIFICATION OF FRAME STRUCTURE UNDER AMBIENT EXCITATION

作　　者：王刚[1] 姚谦峰[1] 

机构地区：[1]北京交通大学土建学院,北京100044

出　　处：《工业建筑》2004年第12期45-47,共3页Industrial Construction

基　　金：国家"十五"科技攻关课题 (编号 :2 0 0 2BA80 6B0 5 )

摘　　要：研究了框架结构在环境激励下的模态识别方法。通过对一个 8层模型框架结构的仿真 ,验证了自然环境激励技术 (NExT)与特征系统实现算法 (ERA)结合的有效性。考虑了利用加速度信号、传感器噪声、传感器数量等因素的影响 ,指出NExT ERA模态识别方法适用于框架结构的监测、诊断。Modal parameter identification of frame structure s under ambient excitation is studied. To verify the effectiveness of natural ex citation technique and eigensystem realization algorithm (NExT/ERA), numeric sim ulation of an 8 storey model frame structure was carried out. During the simula tion, practical factors such as acceleration measuring, noise of sensors and num bers of sensors were accounted. It reveals that NExT/ERA is suitable for frame s tructures′ monitoring and diagnosis.

关 键 词：框架结构体系 模态识别 环境激励 自然环境 噪声 加速度 信号 模型框架 技术 方法研究 

分 类 号：TU323.5[建筑科学—结构工程]