基于倾角测试的桥梁变形实时监测研究
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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 diflection 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.
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 diflection 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.
引文
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[9]徐金锋.利用新型倾角仪测量桥梁挠度方法的理论分析研究[D].兰州:兰州交通大学,2009.
[10]叶贵如,周玉龙.倾角仪在大跨度桥梁挠度检测中的应用[J].公路交通科技,2009,26(11):103-106. YE Gui-ru,ZHOU Yu-long.Application of inclinometer in deflection test for long-span bridges[J].Journal of Highway and Transportation Research and Development,2009, 26(11 ):103 - 106.
[11]杨学山,马树林.QY型倾角仪瞬态反应测试方法的研究[J].地震工程与工程振动,2002,22(2):97-100. YANG Xue-shan,MA Shu-lin.Measuring method for transient response of model QY inclinometer[J].Earthquake Engineering and Engineering Vibration,2002,22(2 ): 97 - 100.
[12]侯兴民,杨学山,马树林,等.陶赖昭松花江特大桥挠度测量分析[J].地震工程与工程振动,2003,23(2): 77-80. HOU Xing-min,YANG Xue-shan,MA Shu-lin,et al. Analysis of measured deflection of bridge at Taolaizhao across Songhuajiang river[J].Earthquake Engineering and Engineering Vibration,2003,23(2):77 - 80.
[2]王磊.大型桥梁健康监测中挠度测量技术研究[D].南京:东南大学,2006.
[3]杨建春,陈伟民.连通管式光电液位传感器在桥梁挠度监测中的应用[J].传感器与微系统,2006,25(8): 79-81. YANG Jian-chun,CHEN Wei-min.Application of connected pipe optoelectronic liquid level sensor in bridge deflection monitoring[J].Transducer and Microsystem Technologies, 2006,25(8):79 -81.
[4]伊廷华,张永恒,李宏男.多路径效应在GPS结构健康监测中的研究进展[J].振动与冲击,2009,28(9): 102-108. YI Ting-hua,ZHANG Yong-heng,LI Hong-nan.Study ??progress of multipath effect in structural health monitoring based on GPS[J].Journal of Vibration and Shock,2009, 28(9):102 - 108.
[5]Lin S S,Liao J C.Lateral response evaluation of single piles using inclinometer data[J].Journal of Geotechnical and Geoenvironmental Engineering,2006,132(12):1566 - 1573.
[6]Ooi P S K,Ramsey T L.Curvature and bendingmoments from inclinometer data[J].International Journal of Geomechanics, 2003.3(1):64 - 74.
[7]杨小森,闫维明,陈彦江,等.基于倾角仪的桥梁挠度测试方法研究[J].土木工程学报,2010,43(增): 105-111. YANG Xiao-sen,YAN Wei-ming,CHEN Yan-jiang,et al. Bridge deflections testing method based on using inclinometers [J].China Civil Engineering Journal,2010,43(S ): 105 -111.
[8]侯兴民,杨学山,黄侨.利用倾角仪测量桥梁的挠度[J].桥梁建设,2004.(2):69-72. HOU Xing-min,YANG Xue-shan,HUANG Qiao.Using inclinometers to measure bridge deflections[J].Bridge Construction,2004(2):69 - 72.
[9]徐金锋.利用新型倾角仪测量桥梁挠度方法的理论分析研究[D].兰州:兰州交通大学,2009.
[10]叶贵如,周玉龙.倾角仪在大跨度桥梁挠度检测中的应用[J].公路交通科技,2009,26(11):103-106. YE Gui-ru,ZHOU Yu-long.Application of inclinometer in deflection test for long-span bridges[J].Journal of Highway and Transportation Research and Development,2009, 26(11 ):103 - 106.
[11]杨学山,马树林.QY型倾角仪瞬态反应测试方法的研究[J].地震工程与工程振动,2002,22(2):97-100. YANG Xue-shan,MA Shu-lin.Measuring method for transient response of model QY inclinometer[J].Earthquake Engineering and Engineering Vibration,2002,22(2 ): 97 - 100.
[12]侯兴民,杨学山,马树林,等.陶赖昭松花江特大桥挠度测量分析[J].地震工程与工程振动,2003,23(2): 77-80. HOU Xing-min,YANG Xue-shan,MA Shu-lin,et al. Analysis of measured deflection of bridge at Taolaizhao across Songhuajiang river[J].Earthquake Engineering and Engineering Vibration,2003,23(2):77 - 80.
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