Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Using ultrasonic wave propagation to grading new wooden and concrete poles
The reliability of electric lines depends on the quality of their support structures. In Brazil these structures are usually made of wood or concrete. The useful life of these structures on the fields is greatly dependent on the initial quality of its component material. If the initial quality of these poles presents significantly variability it is important to know, before its acceptation and installation. The goal of this research is to evaluate the variability of the new wooden and concrete poles and establish, with a non-destructive evaluation, a methodology to grading them. Wooden and concrete poles were bought from different suppliers. The poles were evaluated with ultrasonic equipment with 25 kHz transducers and with static destructive test, supporting the pole as a cantilever by clamping it at the butt end and applying load to the pole near to the top. With the non-destructive testing (ultrasound), the velocity of the wave propagation (V) was determined. To establish a correlation between V and the initial pole resistance the results obtained with the ultrasonic test was correlated with the results obtained trough a static bending test. These preliminary results confirmed that there is a great variation on the critical resistance of new poles supplied to the electricity companies and the ultrasonic test can be useful for pole grading.
Using ultrasonic wave propagation to grading new wooden and concrete poles
The reliability of electric lines depends on the quality of their support structures. In Brazil these structures are usually made of wood or concrete. The useful life of these structures on the fields is greatly dependent on the initial quality of its component material. If the initial quality of these poles presents significantly variability it is important to know, before its acceptation and installation. The goal of this research is to evaluate the variability of the new wooden and concrete poles and establish, with a non-destructive evaluation, a methodology to grading them. Wooden and concrete poles were bought from different suppliers. The poles were evaluated with ultrasonic equipment with 25 kHz transducers and with static destructive test, supporting the pole as a cantilever by clamping it at the butt end and applying load to the pole near to the top. With the non-destructive testing (ultrasound), the velocity of the wave propagation (V) was determined. To establish a correlation between V and the initial pole resistance the results obtained with the ultrasonic test was correlated with the results obtained trough a static bending test. These preliminary results confirmed that there is a great variation on the critical resistance of new poles supplied to the electricity companies and the ultrasonic test can be useful for pole grading.
Using ultrasonic wave propagation to grading new wooden and concrete poles
Einsatz der Ultraschallwellenausbreitung zur Bewertung neuer Holz- und Betonhochspannungsmaste
Goncalves, R. (Autor:in) / Graziano Magalhaes, P.S. (Autor:in) / Herrera, S. (Autor:in) / Bartholomeu, A. (Autor:in)
2006
5 Seiten, 3 Bilder, 4 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
| Engineering Index Backfile | 1922
Engineering Index Backfile | 1934
Calculation of Wooden Line Poles
| Engineering Index Backfile | 1930
| Engineering Index Backfile | 1905
Mechanical resistance of wooden poles
| Engineering Index Backfile | 1919