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基于新型疲劳传感器的东海大桥疲劳监测系统 胡明敏，张明，李训涛 (南京航空航天大学力学中心,江苏 南京,210016) 摘要 基于特殊退火处理康铜材料具有的不可逆电阻疲劳载荷响应，设计了适用于桥梁疲劳载荷检测的数字式传感器和监测系统，满足了大型桥梁结构循环应力低、工作寿命长和信号传输距离远的测试要求。根据桥梁载荷谱的瑞利分布特点，设计了双疲劳计响应载荷谱测定方法，得到疲劳传感器电阻变化与桥梁瑞利载荷谱的对应关系。并简要介绍了基于该传感器的疲劳载荷监测系统和在东海大桥监测应用情况，该系统与目前采用的其它方法相比效率高、精度好，适用于大型桥梁疲劳损伤的长期监测。 关键词 疲劳传感器，大型桥梁，损伤监测，载荷谱 中图分类号：U446 文献标识码：A FATIGUE MONITORING SYSTEMS FOR DONGHAI-BRIGDE BASED ON NEW FATIGUE SENSOR HU Mimming , ZHANG Ming , Li Xuntao (College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics Nanjing 210016,China) Abstract:, The copper-nickel alloys for special annealing treating is possessed of properties of permanent resistance change when it experienced to fatigue loading ,A new digital fatigue sensor monitoring systems was designed for fatigue loading monitoring of long-span bridge, it can satisfy fatigue monitoring of long-span structure which works usually in relative low alternating strain 、 long life and long distance signal transmitting. the Rayleigh density distribution which is the loading characteristic of bridge structure response was also conducted successfully., and the relation between resistance change of fatigue life The relation between resistance change of fatigue life gauge and Rayleigh distribution parameter was established by a program calculation with dual sensor design in a fatigue life gauge. The monitoring systems based on this fatigue sensor and its application on DONGHAI-BRIGDE was also introduced in this paper. It has high. efficiency and more accuracy compared to the other methods recently in use ,and is vary suitable for long time monitoring of long-span bridge. Key words fatigue sensor，long-span bridge, fatigue damage monitoring，loading spectrum E-mail:nuaa1-hu@263.net 1引言 近年来，大型桥梁的安全性问题日益引起人们的广泛关注，而这类大型复杂结构是在交变载荷作用下长期工作的，其耐久性主要是疲劳损伤引起的。早期疲劳损伤往往不易检测到，但其带来的后果往往是灾难性的。由于我国现行结构设计规范缺乏对大型复杂结构疲劳设计时对疲劳问题的足够考虑，以及目前对疲劳监测缺乏有效手段，其潜在的安全隐患突出，研究高效可靠的疲劳监测系统意义重大。桥梁承受日常 各种荷重车辆的反复作用，其整个生命期就是车辆反 作者简介：