Vibration testing of a steel girder bridge using cabled and wireless sensors

doi:10.1007/s11709-011-0113-y

Front Arch Civil Eng Chin

2011, Vol. 5

Issue (3) : 249-258 https://doi.org/10.1007/s11709-011-0113-y

RESEARCH ARTICLE

Vibration testing of a steel girder bridge using cabled and wireless sensors

Dapeng ZHU¹, Yang WANG¹(

), James BROWNJOHN²

1. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; 2. Department of Civil and Structural Engineering, The University of Sheffield, Sheffield, S1 3JD, UK

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Abstract

Being able to significantly reduce system installation time and cost, wireless sensing technology has attracted much interest in the structural health monitoring (SHM) community. This paper reports the field application of a wireless sensing system on a 4-span highway bridge located in Wayne, New Jersey in the US. Bridge vibration due to traffic and ambient excitation is measured. To enhance the signal-to-noise ratio, a low-noise high-gain signal conditioning module is developed for the wireless sensing system. Nineteen wireless and nineteen cabled accelerometers are first installed along the sidewalk of two neighboring bridge spans. The performance of the wireless sensing system is compared with the high-precision cabled sensing system. In the next series of testing, 16 wireless accelerometers are installed under the deck of another bridge span, forming a 4 × 4 array. Operating deflection analysis is successfully conducted using the wireless measurement of traffic and ambient vibrations.

Keywords wireless sensing structural health monitoring (SHM) signal conditioning operating deflection analysis ambient vibration

Corresponding Author(s): WANG Yang,Email:yang.wang@ce.gatech.edu

Issue Date: 05 September 2011

Cite this article:

Dapeng ZHU,Yang WANG,James BROWNJOHN. Vibration testing of a steel girder bridge using cabled and wireless sensors[J]. Front Arch Civil Eng Chin, 2011, 5(3): 249-258.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-011-0113-y
https://academic.hep.com.cn/fsce/EN/Y2011/V5/I3/249

Fig.1 High-gain signal conditioning board (6.1 cm × 4.1 cm)

Tab.1 Parameters of the accelerometers used by the cabled and wireless systems

Fig.2 Schematic of the highway bridge (US 202 & NJ 23, Wayne, New Jersey, US)

Fig.3 Picture of spans #1 and #2 (view from the east side of the bridge)

Fig.4 Deployment of 19 pairs of cabled and wireless accelerometers on the northbound sidewalk

Fig.5 Pictures of the deployment on northbound sidewalk. (a) Wireless and cabled sensors on the northbound sidewalk; (b) wireless server and cabled DAQ system at the east side of the bridge; (c) cabled and wireless accelerometers; (d) inside view of the waterproof package of a wireless sensing unit

Fig.6 Comparison of acceleration time histories and PSD plots between cabled and wireless systems deployed on northbound sidewalk (deployment shown in Fig. 5). (a) Location #6; (b) location #10; (c) location #15

Fig.7 Close-up view of five seconds of overlaid acceleration data collected by the cabled and wireless systems at locations #6 and #10

Fig.8 Deployment of wireless sensing nodes on southbound span #2

Fig.9 Acceleration time histories and PSD plots of wireless measurement on southbound span #2 (deployment shown in Fig. 8). (a) Location #5; (b) location #10; (c) location #15

Fig.10 First four operating deflection shapes of southbound span #2

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