Bridge damage detection method based on vibration theory needs to accurately extract the dynamic parameters of the bridge,and dynamic parameter identification is the first step of bridge damage detection.In order to extract the dynamic parameters of 5-span pre-stressed concrete simply supported beam bridge,two groups of vibration tests were carried out.The dynamic characteristics of every single span and the overall vibration characteristics of the all spans were studied.4 dynamic modal parameters of every single span were calculated with peak picking method,half power method and cross spectrum method based on the smart wireless sensor measurement results.At the same time,the vibration transmission,the relation between the excitation span and the no excitation spans were also discussed.Results show that:the length of the pier had effect to the natural frequencies;vibration can spread across all spans with ballast uniformly distributed load;the predominant mode of the span with vertical excitation was bending mode,and the predominant mode of no excitation spans more likely behave the torsional mode.The research results will be used as the foundation study of the bridge health monitoring technology.
Key words
Multi-span /
Pre-stressed concrete /
Bridge /
vibration experiment /
Dynamic parameters /
Health monitoring
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