Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
GPR inspection of the world's longest timber bridge
When completed in 1935 the Hornibrook Highway, a road-bridge crossing Bramble Bay in South-East Queensland Australia, was the longest bridge in the southern hemisphere totalling 2.68km in length. Of the bridge's 294 span superstructure, 292 spans were constructed of Australian hardwood timber. It is believed to be the longest remaining timber bridge superstructure in the world. Today the bridge accommodates pedestrians, cyclists and recreational fisherman. It is planned for replacement, however until this occurs the bridge needs to be maintained in a safe condition. A combination of ground penetrating radar (GPR) and visual inspection was successfully demonstrated to detect, locate and estimate the extent and severity of girder defects on the Hornibrook Highway Bridge in around a fifth of the time and cost of the traditional approach of 'visual inspection plus test drilling'. Predictions made by GPR were verified in virtually all cases by test drilling, producing a high degree of confidence in the predictions. The ability of GPR to locate isolated defects led to numerous defects being found that would have gone undetected based on the traditional visual inspection or targeted test drilling. Furthermore the ability to scan the entire length of girders and compare with the results of visual and drilling inspection gave greater confidence that no critical defects had been overlooked. The successful application of GPR on the Hornibrook Bridge has led to its ongoing use as an annual monitoring tool in conjunction with traditional inspections, until the bridge is replaced.
GPR inspection of the world's longest timber bridge
When completed in 1935 the Hornibrook Highway, a road-bridge crossing Bramble Bay in South-East Queensland Australia, was the longest bridge in the southern hemisphere totalling 2.68km in length. Of the bridge's 294 span superstructure, 292 spans were constructed of Australian hardwood timber. It is believed to be the longest remaining timber bridge superstructure in the world. Today the bridge accommodates pedestrians, cyclists and recreational fisherman. It is planned for replacement, however until this occurs the bridge needs to be maintained in a safe condition. A combination of ground penetrating radar (GPR) and visual inspection was successfully demonstrated to detect, locate and estimate the extent and severity of girder defects on the Hornibrook Highway Bridge in around a fifth of the time and cost of the traditional approach of 'visual inspection plus test drilling'. Predictions made by GPR were verified in virtually all cases by test drilling, producing a high degree of confidence in the predictions. The ability of GPR to locate isolated defects led to numerous defects being found that would have gone undetected based on the traditional visual inspection or targeted test drilling. Furthermore the ability to scan the entire length of girders and compare with the results of visual and drilling inspection gave greater confidence that no critical defects had been overlooked. The successful application of GPR on the Hornibrook Bridge has led to its ongoing use as an annual monitoring tool in conjunction with traditional inspections, until the bridge is replaced.
GPR inspection of the world's longest timber bridge
Prüfung der längsten Holzbrücke der Welt mit Bodenradar
Muller, Wayne (Autor:in)
2008
12 Seiten, 10 Bilder, 1 Tabelle, 4 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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