A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Modal parameter identification for a GFRP pedestrian bridge
Dynamic experiments were conducted an all-fiber reinforced polymer (FRP) composite pedestrian bridge. The structure was excited by impact and human-induced vibrations. The peak-picking method and stochastic subspace identification method were used to extract structural dynamic characteristics without knowing the input excitation. Both methods proved to be applicable as output-only methods in situ and in real time. Better results were obtained from ambient excitation than from impact excitation. The joint typen used in the truss structure - bolted joints in one span and adhesively bonded joints in the other span - markedly influenced the dynamic behavior of the two spans. The lowest natural frequency resulted from the first lateral mode and was 26% to 28% smaller for the bolted span than for the bonded span. The bolted span, however, exhibited higher damping ratios than the bonded span due to friction in the bolted joints. The resulting natural frequencies for the tested structure were of the same order of magnitude as for other FRP bridges.
Modal parameter identification for a GFRP pedestrian bridge
Dynamic experiments were conducted an all-fiber reinforced polymer (FRP) composite pedestrian bridge. The structure was excited by impact and human-induced vibrations. The peak-picking method and stochastic subspace identification method were used to extract structural dynamic characteristics without knowing the input excitation. Both methods proved to be applicable as output-only methods in situ and in real time. Better results were obtained from ambient excitation than from impact excitation. The joint typen used in the truss structure - bolted joints in one span and adhesively bonded joints in the other span - markedly influenced the dynamic behavior of the two spans. The lowest natural frequency resulted from the first lateral mode and was 26% to 28% smaller for the bolted span than for the bonded span. The bolted span, however, exhibited higher damping ratios than the bonded span due to friction in the bolted joints. The resulting natural frequencies for the tested structure were of the same order of magnitude as for other FRP bridges.
Modal parameter identification for a GFRP pedestrian bridge
Bai, Yu (author) / Keller, Thomas (author)
Composite Structures ; 81 ; 90-100
2008
11 Seiten, 18 Bilder, 5 Tabellen, 28 Quellen
Article (Journal)
English
Bolzenverbindung , Brücke (Bauwerk) , Dämpfung , dynamische Charakteristik , dynamisches Verhalten , Echtzeit , Erregung , Fachwerkträger , faserverstärkter Kunststoff , Klebeverbindung , Modalanalyse , Reibung , Resonanzfrequenz , Schwingung , statistischer Prozess , Stoßanregung , Stoßbeanspruchung
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