Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 773-780.doi: 10.13229/j.cnki.jdxbgxb20180562

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Damage assessment of bridge construction based onmulti⁃stage subregion mobile test

Wan⁃heng LI1,2(),Lin SHEN1,Shao⁃peng WANG1,Shang⁃chuan ZHAO1()   

  1. 1. Research Institute of Highway，Ministry of Transport，Beijing 100088, China
    2. Zhonglu Traffic Inspection and Certification Co. , Ltd. ，Beijing 100088，China
  • Received:2018-06-04 Online:2019-05-01 Published:2019-07-12
  • Contact: Shang?chuan ZHAO E-mail:wh.li@rioh.cn;sc.zhao@rioh.cn

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Abstract:

To solve the problem of excessive number of sensors and to optimize the measuring points in damage assessment of bridge structures, a method of multi?stage subregion mobile test was presented based on the displacement coordination condition of continuum and state stochastic space theory. This method can be used to identify the mode shape of overall structure by sub?region.The diagnosis method based on modal flexibility coefficient for angle element as damage index is proposed. The analysis results show that the new approach can exactly and efficiently obtain complete structural dynamic response data with less equipment conditions, and gain more precise outcome.

Key words: bridge engineering, multi?stage subregion, modal flexibility, damage diagnosis, damage assessment

CLC Number: 

  • U414

Fig.1

Mobile testing solution of simple beam"

Fig.2

Comparison of displacement mode betweentwo?stage and overall structures"

Fig.3

Comparison of displacement modes betweenadjusted and overall structures(two?stage)"

Fig.4

Flexible influence distribution"

Fig.5

Comparison of displacement mode betweenthree?stage and overall structures"

Fig.6

Comparison of displacement modes betweenadjusted and overall structures(three?stage)"

Fig.7

Damage identification results in differentoperating conditions"

Fig.8

Mobile testing solution of continuous concrete bridge"

Fig.9

Comparison of displacement mode between three?stage and overall for continuous concrete"

Fig.10

Comparison of displacement modes betweenadjusted and overall structures"

Fig.11

Modal flexibility matrix for continuousbeam bridge"

Fig.12

Single damage identification of concretecontinuous bridge"

Fig.13

Multiple damage identification of concretecontinuous bridge"

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