Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (1): 115-122.doi: 10.6040/j.issn.1672-3961.0.2019.063

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Bridge monitoring and warning system based on digital measurement technology

Chengxin YU1(),Guojian ZHANG2,*(),Yongqian ZHAO3,Xiaodong LIU4,Xinhua DING5,Tonglong ZHAO6   

  1. 1. Business school, Shandong Jianzhu University, Jinan 250101, Shandong, China
    2. School of Environmental Science and Spatial Informatics, China University of Mining & Technology, 221116 Xuzhou, China
    3. School of Science, Shandong Jianzhu University, Jinan 250101, Shandong, China
    4. College of Continuing Education, Shandong Jianzhu University, Jinan 250101, Shandong, China
    5. Map Institute of Shandong Province, Jinan 250001, Shandong, China
    6. Colledge of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan 250101, Shandong, China
  • Received:2019-02-15 Online:2020-02-20 Published:2020-02-14
  • Contact: Guojian ZHANG E-mail:ycx1108@126.com;G_J_Zhang@cumt.edu.cn
  • Supported by:
    江苏省研究生科研与实践创新计划项目(KYCX19_2162);中国矿业大学研究生科研与实践创新计划项目(KYCX19_2162);山东省科技攻关计划项目(2010GZX20125);2016山东建筑大学博士科研基金资助项目(XNBS1635);山东省住房和城乡建设厅科技计划项目(2017-K2-001)

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Abstract:

In order to make up the deficiency of the traditional measuring method in monitoring the whole deformation and real-time monitoring of the bridge and overcome the defect of digital photography in monitoring the three-dimensional deformation of a bridge, this paper presented the image matching-time baseline parallax method: a digital camera was set up in the proper place, and a reference plane, consisting of reference points, was not far from the digital camera. Reference plane was perpendicular to the photographic direction, and the monitoring points were on the bridge. The two-dimensional deformation on the object plane of the deformation point was obtained based on image matching-time baseline parallax method, then the horizontal deformation on object plane was disassembled into the bridge direction and the direction perpendicular to bridge direction based on the principle of three-dimensional deformation monitoring, The three-dimensional deformation of the bridge was got. Results showed that measurement accuracy of the bridge was 0.72 mm and 1.16 mm in X and Z direction on object plane, respectively. It could meet accuracy requirements of deformation monitoring. As Phoenix mountain road-bridge showed good flexibility in X, Y, Z and comprehensive direction, and the absolute of the maximum positive and negative deflection was 7.57 mm, which was approximately equal to 1/8 of the allowable deflection of the bridge (L/1 000), and the bridge was in good health. Bridge health monitoring and warning system could achieve the integration of data acquisition, storage, processing and display. The deformation curves could show the deformation trend of the bridge and effectively warn the potential danger.

Key words: digital measuring technique, image matching-time baseline parallax method, bridge, three-dimensional deformation, dynamic monitoring, safety warning

CLC Number: 

  • P234.1

Table 1

Monitoring Accuracy verification of a digital cameramm"

线段 解算长度 精测长度 差值
U0—U2 588 589 1
U1—U3 596 595 1
U2—U4 599 599 0

Fig.1

Image matching-time baseline parallax method"

Fig.2

Interface of bridge health monitoring and warning software"

Fig.3

Phoenix Mountain Road Bridge test site"

Fig.4

Principle of three dimensional deformation monitoring"

Table 2

Space coordinates of pointsm"

点名 X Y Z
SONY500 999.456 994.122 99.950
U1 942.712 955.451 101.884
U2 948.751 954.529 101.955
U3 954.701 953.632 102.005
U4 958.567 952.600 102.786
U5 974.324 950.199 102.684

Table 3

Monitoring accuracy of a digital camera in testsmm"

参考点 X方向监测精度 Z方向监测精度 实际监测精度
C6 0.42 0.63 0.78
C7 0.80 0.59 0.99
C8 0.68 1.05 1.25
C9 0.75 1.26 1.47

Table 4

Three-dimensional deformation values of deformation pointsmm"

序号 U3 U4 U5
X Y Z X Y Z X Y Z
1 -1.59 -1.27 2.58 -1.05 -0.84 2.81 -1.55 -1.24 2.50
2 -1.50 -1.20 -0.39 -1.09 -0.87 0.53 -2.57 -2.05 -0.42
3 -1.30 -1.04 0.37 -0.86 -0.69 0.37 -1.85 -1.48 -0.58
4 -1.59 -1.27 1.23 -1.05 -0.84 1.17 -1.55 -1.24 -0.40
5 -1.59 -1.27 1.05 -1.05 -0.84 1.93 -0.83 -0.66 -0.56
6 -1.59 -1.27 0.56 -1.05 -0.84 0.69 -1.55 -1.24 1.27
7 0.00 0.00 0.00 0.73 0.58 0.00 0.73 0.58 -0.93
8 0.53 0.42 0.98 1.11 0.89 1.25 0.16 0.12 1.55
9 -2.05 -1.64 0.67 -1.72 -1.37 0.63 -3.20 -2.56 0.01
10 -1.59 -1.27 -1.67 -1.05 -0.84 -1.90 -1.55 -1.24 -2.57
11 -0.76 -0.61 0.54 -0.24 -0.19 0.53 -1.21 -0.97 0.51
12 -1.60 -1.28 -2.06 -1.05 -0.84 -2.30 -0.83 -0.66 -3.00
13 -2.02 -1.62 -1.67 -1.59 -1.27 -1.90 -2.58 -2.06 -2.57
14 -1.50 -1.20 -0.42 -1.09 -0.87 -0.56 -1.84 -1.47 -1.22

Fig.5

Dynamic deformation curves of U1-U5"

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