基于倾角测试的桥梁变形实时监测研究  

Bridge deflection real-time monitoring based on inclined angle measurement

作　　者：李勇[1] 闫维明[1] 陈彦江[1] 

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《振动与冲击》2013年第5期65-69,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50978009;51008102);北京市教育委员委员会科技计划重点项目(KZ200910005002)

摘　　要：对基于结构的倾角测试能实时、精确得到结构变形,以悬臂梁及简支梁为例,推导倾角与挠度间关系,利用MATLAB编程工具对倾角进行积分、拟合得到结构变形,并通过钢梁加载试验与实测挠度进行对比,通过健康监测工程实例介绍倾角仪在变形监测中的应用。分析表明,建立的倾角和变形间关系合理可行,不同结构进行变形监测需考虑边界条件;基于MATLAB对倾角拟合挠度曲线过程简单,与实测挠度吻合较好;在桥梁健康监测系统中用倾角仪对结构进行变形监测,可得结构实时变形曲线与任一时刻变形规律。Deflection monitoring is an important aspect of health monitoring system, and by inclined angle measurement the structural deflection can be acquired precisely and in real-time （RT）. The relation between inclined angle and deflection was deduced in the case of cantilever or simply supported beam. The inclined angle was fitted and then integrated to obtain the direction with the help of MATLAB and the result was compared with that by direct deflection measurement in the test of a steel beam under loads. A health monitoring engineering project was introduced to show the inclinometers＇ application in deflection monitoring. The analysis shows that the deduced relationship between incliner angle and deflection is reasonable, while the boundary conditions should be considered with regard to different structures. The deflection obtained though inclined angle integration is nearly identical with the deflection measured. If inclinometers are used in the health monitoring system, then the RT deflection and deflection at any time point of the structures can be obtained.

关 键 词：倾角 变形 MATLAB 数值积分 健康监测 

分 类 号：U446[建筑科学—桥梁与隧道工程]