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TECHNICAL PAPERS

Damage Detection in Simply Supported Concrete Bridge Structure Under Moving Vehicular Loads

[+] Author and Article Information
X. Q. Zhu

School of Civil and Resource Engineering, University of Western Australia, Crawley, Australia

S. S. Law

 Hong Kong Polytechnic University, Hunghom, Hong Kong, P.R.C.

J. Vib. Acoust 129(1), 58-65 (Feb 03, 2006) (8 pages) doi:10.1115/1.2202150 History: Received November 25, 2003; Revised February 03, 2006

A method for damage detection of a simply supported concrete bridge structure in time domain is presented using the interaction forces from the moving vehicles as excitation. The vehicular loads are modeled as a group of vehicle-bridge interaction forces moving at a prescribed velocity, and the bridge is modeled as an Euler-Bernoulli beam simply supported at both ends. A damage function is used to simulate the crack damage in the reinforced concrete beam. The vehicle-bridge interaction forces and the structural damage in the bridge deck are identified from the measured responses in sequence of iteration without prior knowledge of the moving loads. The effects of parameters of the vehicle-bridge system and measurement noise on the damage detection result are studied. Simulation results show that the method is effective and noise insensitive to damage detection in the concrete bridge structure under moving vehicular loads.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 8

Identified moving loads using a different number of elements

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Figure 9

Vehicle-bridge system

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Figure 10

Identified moving loads from different noise measurements

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Figure 11

Damage index from different noisy measurements (distributed damage)

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Figure 5

Identified moving loads from different noisy measurements (distributed damage)

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Figure 4

Identified damage index from different noisy measurements (local damage)

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Figure 3

Identified moving loads from different noisy measurements (local damage)

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Figure 2

Equivalent nodal loads for a beam element loaded by the bridge-vehicle interaction force

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Figure 1

A vehicle-bridge system

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Figure 6

Damage index from different noisy measurements (distributed damage)

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Figure 7

Damage index identified using a different number of elements (distributed damage)

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