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Title
| Vibration-Based Damage Detection on a Highway Bridge |
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Authors
| Feltrin, G./ Motavalli, M. |
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Magazine/Conference
| IABMAS’02 1st Int. Conference on Bridge Mainte-nance, Safety and Management, Barcelona, July 14-17, 2002 |
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Vol+No+Page v/b
| Proceedings |
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Abstract
| Vibration based damage detection has attracted much attention in the last years because of its potential application in health monitoring of civil engineering structures. Many laboratory tests show promising results in detecting, locating and estimating damage in structural components. However, only little experience is available about the application of vibration based damage detection on real structures under operational conditions. To investigate this issue EMPA performed tests on a concrete highway bridge with spans of 29 m, 37m and 29 m. In the first test phase, a permanent monitoring system with 16 accelerometers and 19 temperature sensors was installed on the bridge. This system was operational from Mai 2000 to December 2000 and was designed to study the sensitivity of modal parameters to temperature and traffic loads. In the second test phase, which took place in January 2001, the bridge was progressively damaged. These tests were designed to study the sensitivity of modal parameters to structural damage. Forced vibration modal tests with a servo-hydraulic shaker were performed to determine the modal parameters. The results show that generally damage affects the modal parameters in a rather complex way. Severe damage produces changes of eigenfrequencies, which are generally smaller than those which are due to environmental parameters. The latter are strongly affected by temperature. The long term changes of eigenfrequencies correlate quite well with the long term changes of temperature so that they can be predicted with reasonable accuracy. However, the short term changes of eigenfrequencies show a significant influence from other environmental parameters. This may prevent the fast and reliable detection of small to moderate damage. |
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