TLS for Dynamic Measurement of the Elastic Line of Bridges

被引:30
作者
Artese, Serena [1 ,2 ]
Zinno, Raffaele [3 ]
机构
[1] Univ Calabria, Dept Civil Engn, Via Pietro Bucci Cubo 45B, I-87036 Arcavacata Di Rende, CS, Italy
[2] Univ Calabria, Spring Res Srl, Spin Off, Via Pietro Bucci Cubo 45B, I-87036 Arcavacata Di Rende, CS, Italy
[3] Univ Calabria, Dept Informat Modeling Elect & Syst Engn, Via P Bucci Cubo 42C, I-87036 Arcavacata Di Rende, Italy
来源
APPLIED SCIENCES-BASEL | 2020年 / 10卷 / 03期
关键词
laser scanner; line scanner; structure monitoring; deformation; dynamic measurements; IDENTIFICATION; DEFLECTION;
D O I
10.3390/app10031182
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The evaluation of the structural health of a bridge and the monitoring of its bearing capacity are performed by measuring different parameters. The most important ones are the displacements due to fixed or mobile loads, whose monitoring can be performed using several methods, both conventional and innovative. Terrestrial Laser Scanner (TLS) is effectively used to obtain the displacements of the decks for static loads, while for dynamic measurements, several punctual sensors are in general used. The proposed system uses a TLS, set as a line scanner and positioned under the bridge deck. The TLS acquires a vertical section of the intrados, or a line along a section to be monitored. The instantaneous deviations between the lines detected in dynamic conditions and the reference one acquired with the unloaded bridge, allow to extract the displacements and, consequently, the elastic curve. The synchronization of TLS acquisitions and load location, obtained from a Global Navigation Satellite System GNSS receiver or from a video, is an important feature of the method. Three tests were carried out on as many bridges. The first was performed during the maneuvers of a heavy truck traveling on a bridge characterized by a simply supported metal structure deck. The second concerned a prestressed concrete bridge with cantilever beams. The third concerned the pylon of a cantilever spar cable-stayed bridge during a load test. The results show high precision and confirm the usefulness of this method both for performing dynamic tests and for monitoring bridges.
引用
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页数:23
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