Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Damage assessment in wood beams through vibration measurement
A large number of wood poles are presently used in the electrical power transmission industry. This is partly due to their relative low initial costs. Many of these poles are subject to decay due to environmental effects (such as internal rotting), generated by fungal and insect attacks, which are enhanced by the leaching out of the impregnated chemical preservatives; these effects contribute to the loss of strength along the height of the transmission tower wood poles. Therefore these poles need to be examined periodically for damage, which can significantly affect their performance. This study was carried out to investigate the effect of this type of damage on wood poles, using their vibrations responses. The pole was modeled as a cantilever rectangular beam and the damage was characterized by introducing an interior rectangular slot at the highly stressed region of the beam. Three beams were examined in this study. The beams were tested using random excitation forces under intact and slotted conditions. Even though the numerical and experimental modal frequencies did not have the same numerical values, they did show the same trend when the slot was introduced. Moreover the first four experimental and numerical modal frequencies decreased appreciably and consistently due to the presence of slot. Results indicate that damage in wood beams could be assessed using vibration responses.
Damage assessment in wood beams through vibration measurement
A large number of wood poles are presently used in the electrical power transmission industry. This is partly due to their relative low initial costs. Many of these poles are subject to decay due to environmental effects (such as internal rotting), generated by fungal and insect attacks, which are enhanced by the leaching out of the impregnated chemical preservatives; these effects contribute to the loss of strength along the height of the transmission tower wood poles. Therefore these poles need to be examined periodically for damage, which can significantly affect their performance. This study was carried out to investigate the effect of this type of damage on wood poles, using their vibrations responses. The pole was modeled as a cantilever rectangular beam and the damage was characterized by introducing an interior rectangular slot at the highly stressed region of the beam. Three beams were examined in this study. The beams were tested using random excitation forces under intact and slotted conditions. Even though the numerical and experimental modal frequencies did not have the same numerical values, they did show the same trend when the slot was introduced. Moreover the first four experimental and numerical modal frequencies decreased appreciably and consistently due to the presence of slot. Results indicate that damage in wood beams could be assessed using vibration responses.
Damage assessment in wood beams through vibration measurement
Budipriyanto, A. (Autor:in) / Swamidas, A.S.J. (Autor:in) / Adluri, S.R. (Autor:in)
2007
10 Seiten, 4 Bilder, 4 Tabellen, 13 Quellen
Aufsatz (Konferenz)
Englisch
experimentelle Untersuchung , Tagungsbericht , Finite-Elemente-Methode , Theorie-Experiment-Vergleich , Freileitungsmast , Holz , Schwingungsmessung , biologische Schädigung , Spalt , Dehnungsmesser , Beschleunigungsmesser , zerstörungsfreie Prüfung , Resonanzfrequenz , Biegeschwingung , Elastizitätsmodul , Feuchtigkeitsgehalt , Feststoffdichte , Schadenfrüherkennung
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