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。
Abstract
Deflection monitoring is an important aspect of health monitoring system, and inclined angle measurement can real-time (RT) and precisely obtain the structural deflection. The relation between inclined angle and deflection is deduced based on cantilever and simply supported beam. Then the deflection is integrated and fitted though inclined angle by MATLAB and this method is compared with the direct deflection measurement during a test of a steel beam under loads. Finally, a health monitoring engineering project is introduced to show inclinometers implication on the deflection monitoring. The analysis shows that the relationship between incliner angle and deflection is reasonable, while the boundary conditions should be considered with regard to different structures. The deflection integrated though incliner angle is nearly identical with the deflection measurement. If the inclinometers are used on the health monitoring system, then the RT deflection and deflection at an arbitrary time point of the structures can be obtained.
关键词
倾角 /
变形 /
MATLAB /
数值积分 /
健康监测
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Key words
incliner angle /
deflection /
MATLAB /
numerical integration /
health monitoring
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李 勇;闫维明;陈彦江 .
基于倾角测试的桥梁变形实时监测研究 [J]. 振动与冲击, 2013, 32(5): 65-69
LI Yong;YAN Wei-ming;CHEN Yan-jiang.
Bridge deflection real-time monitoring based on inclined angle measurement [J]. Journal of Vibration and Shock, 2013, 32(5): 65-69
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