Geodetic monitoring of bridge deformations occurring during static load testing
2015 (English)In: Baltic Journal of Road and Bridge Engineering, ISSN 1822-427X, E-ISSN 1822-4288, Vol. 10, no 1, 17-27 p.Article in journal (Refereed) Published
Terrestrial laser scanning technology has developed rapidly in recent years and has been used in various applications but mainly in the surveying of different buildings and historical monuments. The use for terrestrial laser scanning data for deformation monitoring has earlier been tested although conventional surveying technologies are still more preferred. Since terrestrial laser scanners are capable of acquiring a large amount of highly detailed geometrical data from a surface it is of interest to study the metrological advantages of the terrestrial laser scanning technology for deformation monitoring of structures. The main intention of this study is to test the applicability of terrestrial laser scanning technology for determining range and spatial distribution of deformations during bridge load tests. The study presents results of deformation monitoring proceeded during a unique bridge load test. A special monitoring methodology was developed and applied at a static load test of a reinforced concrete cantilever bridge built in 1953. Static loads with the max force of up to 1961 kN (200 t) were applied onto an area of 12 m(2) in the central part of one of the main beams; the collapse of the bridge was expected due to such an extreme load. Although the study identified occurrence of many cracks in the main beams and significant vertical deformations, both deflection (-4.2 cm) and rising (+2.5 cm), the bridge did not collapse. The terrestrial laser scanning monitoring results were verified by high-precision levelling. The study results confirmed that the TLS accuracy can reach +/- 2.8 mm at 95% confidence level.
Place, publisher, year, edition, pages
Vilnius., Lithuania: Vilnius Gediminas Technical University Press, 2015. Vol. 10, no 1, 17-27 p.
Terrestrial Laser Scanning, precise levelling, load testing, monitoring deformations, cantilever beam
Other Civil Engineering
Research subject Geodesy and Geoinformatics
IdentifiersURN: urn:nbn:se:kth:diva-165167DOI: 10.3846/bjrbe.2015.03ISI: 000352758200003ScopusID: 2-s2.0-84928471319OAI: oai:DiVA.org:kth-165167DiVA: diva2:807519
QC 201505112015-04-232015-04-232015-05-11Bibliographically approved