桁梁局部破断试验中动位移的数字图像测量
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摘要
将数字图像测量技术应用于桁梁结构局部破断试验中结构动位移的测量。对目标测点标记亮斑并布置对比度较强的背景,采用高清晰摄影机在结构破坏过程中采集图像,使用Matlab编制程序对目标点亮斑进行识别,计算其在图像中位置的变化并输出目标点位移曲线。试验结果显示,按该方法可获得符合实际的测点位移数据,具有较高的可行性;另经静载试验验证,可获得相对于破坏试验中较大位移而言可接受的精度。
The digital image processing technique was applied to dynamic displacement measurement in truss-beam local failure test.In the structural model test,light spots were labelled on measuring points and high-contrast ratio background were arranged,then images were collected by high definition camera and identified with computer program designed in Matlab for light spots,whose locations change in the image were calculated,and finally the displacement curves were obtained.This method is verified feasible with displacement data comform to reality by the local failure test of a truss structure,and shows acceptable measuring accuracy relatively to large dynamic diapalcement in failure test,which is verified by static load tests.
The digital image processing technique was applied to dynamic displacement measurement in truss-beam local failure test.In the structural model test,light spots were labelled on measuring points and high-contrast ratio background were arranged,then images were collected by high definition camera and identified with computer program designed in Matlab for light spots,whose locations change in the image were calculated,and finally the displacement curves were obtained.This method is verified feasible with displacement data comform to reality by the local failure test of a truss structure,and shows acceptable measuring accuracy relatively to large dynamic diapalcement in failure test,which is verified by static load tests.
引文
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[5]Lee J J,Shinozuka M.Real-time displacementmeasurement of a flexible bridge using digital imageprocessing techniques[J].Experimental Mechanics,2006,46(1):105-114.
[6]王靖涛,曹红林,丁美英,等.基于数码相机的土三轴试样变形的数字图像测量[J].华中科技大学学报(城市科学版),2004,21(2):1-3.Wang J T,Cao H L,Ding M Y,et al.Digital imagemeasurement of specimen deformation in triaxial testbased on digital camera[J].Journal of Wuhan UrbanConstruction Institute,2004,21(2):1-3.(inChinese)
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[8]邵龙潭,孙益振,王助贫,等.数字图像测量技术在土工三轴试验中的应用研究[J].岩土力学,2006,27(1):29-34.Shao L T,Sun Y Z,Wang Z P,et al.Application ofdigital image processing technique to triaxial test insoil mechanics[J].Rock and Soil Mechanics,2006,27(1):29-34.(in Chinese)
[9]乔英娟,王哲人,陈静云,等.沥青结构层芯样分层变形的数字图像测量方法[J].公路交通科技,2007,24(10):11-15.Qiao Y J,Wang Z R,Chen J Y,et al.Digital imageprocessing technique for measurement of coursedeformation of asphalt core samples[J].Journal ofHighway and Transportation Research andDevelopment,2007,24(10):11-15.(in Chinese)
[10]朱援祥,赵学荣,王勤.数码相机在焊接结构收缩变形测量中的应用[J].焊接,2003(5):16-18.Zhu Y X,Zhao X R,Wang Q.Application of digitalcamera to measuring contraction distortion of weldingstructure[J].Welding&Joining,2003(5):16-18.(in Chinese)
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