Measurement of the Three-Dimensional Dynamic Deflection by the Digital Image Method

• Main Authors: Po-Yuan Huang, 黃柏源
• Other Authors: Chung-Yue Wang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/57873109879300124377

碩士 === 國立中央大學 === 土木工程研究所 === 99 === Displacement measurement is an important item of the health monitoring and diversification performance evaluation of civil infrastructures. Especially after earthquakes, floods and other enormous natural disasters, large number of the population will be dislocated, the recovery processes are usually hampered by the numerous damaged civil infrastructures, some are totally and others are partially. Therefore, it is critical to determine the safety of the partially damaged infrastructures so that the society could regain their usage and could have a speedy return to normalcy. Thus, there is an urgent need for reliable, robust and effective non-destructive evaluation techniques. In this paper, digital image analysis processing is applied to position coordinates of the specific targets on a structure and to calculate its displacements. Further, combines a method that using non-targets measurement with digital video measuring dynamic deflection to develop a non-contact and non-target remote measurement method of bridge deflection. In other hand, by returning the image variation that changes because observation point’s out-of-plane motion, this paper develop a method that using single camera to determine the 3D deflection. Experiments of a vibrating beam were conducted to verify and validate the proposed measurement and analysis techniques. In addition, besides targets and non-targets results, the comparisons with the results obtained by IBIS-S system, Total Station and LiDAR were also conducted to understand the performance of the proposed method.