A New Method to Detect Natural frequency of Bridge Based on Connected Pipes System

摘要：

Modal parameters of bridge especially natural frequencies are important to damage identification in bridge health monitoring.While traditional accelerometer or velocity sensor is not sensitive to low frequency,especially frequency below 1Hz.Measuring precision in low frequency range is not so good.To address this problem,a new method based on connected pipe system which often used to measuring displacement is introduced here.Mathematics model of liquid flow in connected pipes system is set up with hydromechanics knowledge.Natural frequency and properties of frequency response are analyzed according to differential equations.Then vibration experiment is carried out with a vibration instrument whose vibration frequency is controllable.Experimental results show that vibration signals below 5 Hz can be responded by connected pipes.A further application with connected pipes system in Si Banpo Bridge across Yangtze River is introduced.From experiment and application results we can see,connected pipes system is a potential method to detect model parameters especially natural frequency.

关键词： damage identification bridge Modal parameters connected pipes natural frequency

作者: Chen Wei-min Lei xiao-hua Liu Guo-ping Zhang Peng

作者单位: Key Lab for Optoelectronic Technology & System,Chongqing University,Chongqing,China

会议类型: 国际会议

会议名称: The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)

会议地点: 重庆·南京

会议语种:英文

在线出版日期: 2007-05-01（万方平台首次上网日期，不代表论文的发表时间）