Mingshu Sun,∗ Anqi Xu,∗∗ and Jian Liu∗∗∗
3D laser scanning technology, bridge line shape monitoring, finiteelement analysis, temperature
Conventional line shape monitoring methods applied to bridges col- lect observation data only for multiple independent points, which makes obtaining comprehensive and accurate deformation informa- tion for the entire bridge very difficult. This has been addressed by the application of three-dimensional (3D) laser scanning technology, which has expanded the range of line shape monitoring, increased the measurement speed, and improved observation accuracy. How- ever, the monitoring precision of 3D laser scanning technology has not been rigorously demonstrated for long-span bridges subject to large-scale temperature fluctuations. This study addresses this issue by applying 3D laser scanning technology for monitoring the line shape of a concrete-filled steel tube arch bridge with a main span of 300 m under conditions where the temperatures of the main arch components vary due to irregular heating. The results of 3D laser scanning are verified by comparison with the results of simulations using Midas Civil. The measurement results obtained by 3D laser scanning are found to be consistent with the simulation results, and the measured values exhibit a higher precision, which verifies the reliability of 3D laser scanning technology when applied to long-span bridge line shape monitoring.
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