A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Dynamic Testing of Bridges using Traffic-Induced Vibration
Abstract In this paper the increasing necessity of rehabilitation or replacement of bridges is stated. The actual inspection methods in bridges are quite limited, due mainly to a visual examination basis, new techniques of assessment and inspection in bridges must be developed. The structural dynamic response as a non destructive tool in assessing integrity of actual bridges is proposed. The theoretical and experimental background of the proposed method of inspection is presented. The theoretical problem is reduced to a parameter identification procedure (inverse problem), i.e., to estimate the actual dynamic parameters of the bridge (frequencies, damping and mode shapes), starting from the structural dynamic response and to compare them with the parameters estimated in the test performed when the bridge was open to traffic. Therefore, the success of the method is only accomplished if a good estimation of the dynamic parameters is achieved. The traditional estimation is strongly limited when ambient traffic vibrations in bridges recorded by accelerometers are examined. In this paper, a new method is presented for the dynamic parameter estimation which avoids these limitations. This estimation is applied to experimental vibrations recorded in two dynamic tests performed on real viaducts in Barcelona (Spain). The results obtained are compared with those provided by the application of traditional methods whenever possible or by theoretical models. The conclusions of this experimental research shows the effectiveness of the proposed method of estimation when applied properly.
Dynamic Testing of Bridges using Traffic-Induced Vibration
Abstract In this paper the increasing necessity of rehabilitation or replacement of bridges is stated. The actual inspection methods in bridges are quite limited, due mainly to a visual examination basis, new techniques of assessment and inspection in bridges must be developed. The structural dynamic response as a non destructive tool in assessing integrity of actual bridges is proposed. The theoretical and experimental background of the proposed method of inspection is presented. The theoretical problem is reduced to a parameter identification procedure (inverse problem), i.e., to estimate the actual dynamic parameters of the bridge (frequencies, damping and mode shapes), starting from the structural dynamic response and to compare them with the parameters estimated in the test performed when the bridge was open to traffic. Therefore, the success of the method is only accomplished if a good estimation of the dynamic parameters is achieved. The traditional estimation is strongly limited when ambient traffic vibrations in bridges recorded by accelerometers are examined. In this paper, a new method is presented for the dynamic parameter estimation which avoids these limitations. This estimation is applied to experimental vibrations recorded in two dynamic tests performed on real viaducts in Barcelona (Spain). The results obtained are compared with those provided by the application of traditional methods whenever possible or by theoretical models. The conclusions of this experimental research shows the effectiveness of the proposed method of estimation when applied properly.
Dynamic Testing of Bridges using Traffic-Induced Vibration
Casas, Juan R. (author) / Aparicio, Angel C. (author)
1990-01-01
16 pages
Article/Chapter (Book)
Electronic Resource
English
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