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Title
| Temperature and damage effects on modal parameters of a reinforced concrete bridge |
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Authors
| Feltrin, G. |
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Magazine/Conference
| Eurodyn 2002, München, 2. – 5.9.2002 |
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Vol+No+Page v/b
| Proceedings Eurodyn |
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Abstract
| Vibration based damage detection has attracted much attention in the last years because of ist 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 ist applicability on ral structures under operational conditions. To investigate this issue, tests were performed on a concrete highway bridge with spans of 29m, 37m and 29m. 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 effects of environmental parameters on modal parameters. In the second tests phase, 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 damage generally affects the modal parameters in a rather complex way. Severe damage produces changes of eigenfrequencies which are generally smaller than those due to environmental parameters. The latter are strongly affected by temperature. However, the short term changes of eigenfreuqencies seems to be significantly influenced by other environmental parameters, too. Changes in mode shapes provide information about the location of damage. However, small and moderate damage seems to be difficult to detect. |
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