Assessment of bridge expansion joints using long-term displacement measurement under changing environmental conditions

doi:10.1007/s11709-011-0122-x

Front Arch Civil Eng Chin

2011, Vol. 5

Issue (3) : 374-380 https://doi.org/10.1007/s11709-011-0122-x

RESEARCH ARTICLE

Assessment of bridge expansion joints using long-term displacement measurement under changing environmental conditions

Youliang DING(

), Aiqun LI

School of Civil Engineering, Southeast University, Nanjing 210096, China

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Abstract

This paper addresses the problem of condition assessment of bridge expansion joints using long-term measurement data under changing environmental conditions. The effects of temperature, traffic loading and wind on the expansion joint displacements are analyzed and interpreted, which reveal that measured displacements are observed to increase with an increase in temperature and to decrease with increased traffic loading, while the correlation between displacement and wind speed is very weak. Two regression models are developed to simulate the varying displacements under the changes in temperature and traffic loadings. Based on these models, the effects of the environmental conditions are removed to obtain the normalized displacement. Statistical process control using mean value control charts is further used to detect damage to the bridge expansion joints. The results reveal that the proposed method had a good capability for detecting the damage-induced 1.0% variances of the annual changes in the expansion joint displacements.

Keywords structural health monitoring displacement expansion joint temperature effect wind effect traffic loading statistical process control suspension bridge

Corresponding Author(s): DING Youliang,Email:civilding@yahoo.com.cn

Issue Date: 05 September 2011

Cite this article:

Youliang DING,Aiqun LI. Assessment of bridge expansion joints using long-term displacement measurement under changing environmental conditions[J]. Front Arch Civil Eng Chin, 2011, 5(3): 374-380.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-011-0122-x
https://academic.hep.com.cn/fsce/EN/Y2011/V5/I3/374

Fig.1 View of the Runyang Suspension Bridge

Fig.2 Layout of the temperature monitoring of the Runyang Suspension Bridge (units: cm)

Fig.3 Locations of the temperature sensors in the deck section

Fig.4 Correlation between displacement and temperature. (a) Northern abutment; (b) southern abutment

Tab.1 Summary of linear regression models

Fig.5 Correlation between displacement and acceleration RMS. (a) Northern abutment; (b) southern abutment

Tab.2 Summary of the linear regression models

Fig.6 Correlation between displacement and wind speed. (a) Northern abutment; (b) southern abutment

Fig.7 Measured and normalized displacements at 1-day intervals. (a) Northern abutment; (b) southern abutment

Fig.8 Mean value control chart of an intact structure

Fig.9 Mean value control chart of the damaged structure

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