This paper describes the initial stages of an investigation into the use of vibration analysis to monitor the service condition of bridges. As part of the study, frequency response tests are being undertaken on a series of reinforced and post-tensioned concrete beams and slabs to examine the effect of deliberately induced damaged. However, a significant element of the work is the problem of successfully implementing a laboratory research technique into a practical environment. To this end the study includes the long term monitoring of a number of bridges, to determine the significance of environmental conditions on their vibration characteristics and response to the dynamic loads experienced in service.
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