动应变测量在桥梁动挠度识别中的应用分析  

Application Analysis of Dynamic Strain Measurement in Bridge Dynamic Deflection Identification

作　　者：靳明 蒋雨波 JIN Ming;JIANG Yubo(Highway administration Bureau,Henan Provincial Transportation Department,Zhengzhou,Henan 450016,China;Henan Dingzhi Engineering Consulting Co.,Ltd.,Zhengzhou,Henan 450045,China)

机构地区：[1]河南省交通运输厅公路管理局,河南郑州450016 [2]河南鼎智工程咨询有限公司,河南郑州450045

出　　处：《公路工程》2020年第1期190-194,共5页Highway Engineering

基　　金：河南省交通运输厅科技项目(2015Y01)

摘　　要：随着桥梁的发展,桥梁的问题也逐渐增多,近年来,我国出现了多起桥梁安全事故,主要是因为桥梁的变形产生,而挠度为桥梁变形的指标,故研究梁的挠度识别很重要。首先,通过分析和介绍位移模态理论与应变模态理论的异同点,以及应变模态理论得到梁的应变模态的表示,在此基础上,提出了互关函数在梁动挠度识别中的应用。然后,通过以实际工程为研究对象,按照1∶10的比例建立桥梁实验模型,桥梁模型全长10m,截面积为2.52cm^2,高50mm,将其分成20段,每0.5m为一个单元,计算其挠度。最后,进行实际桥梁验证,将实际桥梁的测量值与桥梁模型的挠度计算值进行对比。通过实验得到,对梁施加脉冲荷载研究其动挠度的识别值与精确值之间的吻合度,并且得到测量点的布置对吻合度的影响。对梁施加动荷载,即EL CENTRO地震波,通过对比研究动荷载作用下,动挠度的识别值和精确值之间的吻合度,得到互关函数法在动挠度中的应用,对同类型的研究具体一定的参考价值。With the development of bridges,the problems of bridges have gradually increased.In recent years,there have been many bridge safety accidents in China,mainly due to the deformation of bridges,and the deflection is an indicator of bridge deformation.Therefore,it is very important to study the deflection of beams.Firstly,by analyzing and introducing the similarities and differences between the displacement mode theory and the strain mode theory,and the strain mode theory to obtain the strain mode representation of the beam,on the basis of this,the interaction function of the cross-closing function in the beam deflection is proposed.application.Then,by taking the actual project as the research object,the bridge experimental model is established according to the ratio of 1∶10.The bridge model has a total length of 10 meters,a cross-sectional area of 2.52 square centimeters and a height of 50 mm.It is divided into 20 segments,each 0.5 meters.A unit that studies its deflection.Finally,the measured values of the actual bridge are compared with the calculated values of the deflection of the bridge model.Through the experiment,the pulse load of the beam is applied to study the coincidence degree between the identification value and the exact value of the dynamic deflection,and the influence of the arrangement of the measurement points on the coincidence degree is obtained.Applying dynamic load to the beam,ie EL CENTRO seismic wave,by comparing the relationship between the identification value of the dynamic deflection and the exact value under the dynamic load,the application of the cross-closing function method in dynamic deflection is obtained.Specific reference value for the same type of research.

关 键 词：动应变 动挠度 脉冲荷载 连续梁 

分 类 号：U446[建筑科学—桥梁与隧道工程]