Evaluation of the integrity of RC structure strengthened by external steel plates using the dispersion curves of Lamb wave phase velocity

• Main Authors: yan-ting pan, 潘彥廷
• Other Authors: Chia-Chi Chen
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/33721849337218345350

碩士 === 朝陽科技大學 === 營建工程系碩士班 === 98 === Concrete structures strengthened by steel plate are popular in Taiwan. As full bonding between the steel and matrix concrete is essential for effectively transmitting loading, infilling must be fully filled inside the gap between steel plate and concrete. The defects which are enclosed inside the steel plate may not be observed by visual observation. Present research is a preliminary study on using the dispersive characteristics of the Lamb wave modes traveling within the steel layer to assess the bonding condition between steel plate and substrates. The dispersive curves are obtained by a multichannel analysis of surface wave (MASW). In present study, numerical models were constructed to simulate an impact applying on the surface of a steel plate. The image of numerical dispersion curves were obtained from the dynamic responses of a series of receivers lined up with equal intervals. These images were compared with the theoretical solution obtained from a software DISPERSE. The numerical models include steel plate, steel-concrete bi-layered plate and steel-epoxy-concrete multi-layered plate.