PEI-LING LIULee, K. H.K. H.LeeTSUNG-TSONG WUKuo, M. -K.M. -K.Kuo2009-01-212018-06-292009-01-212018-06-29200109638695http://ntur.lib.ntu.edu.tw//handle/246246/106742https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035313663&doi=10.1016%2fS0963-8695%2800%2900061-X&partnerID=40&md5=2903628c2ce1165e72eefbe211bcc11fThis study develops a method to scan the surface cracks of reinforced concrete using transient elastic wave tests. In the tests, an impact is applied at constant intervals along one side of the crack opening, and the surface response of the concrete due to each impact is measured and recorded. Then the procedure is repeated with the source applied on the opposite side. The method of ellipse intersection is adopted to process the surface response of the concrete structure. An image is then constructed that shows the three-dimensional image of the crack. The image can be used to determine the location of the reinforcing steel bars, the thickness of the covering, and to judge whether the crack penetrates through the rebars. Numerical examples and a model test are presented to verify the effectiveness of this method.application/pdf1237022 bytesapplication/pdfen-US[SDGs]SDG11Cracks; Elastic waves; Impact testing; Nondestructive examination; Steel structures; Surface-opening cracks; Reinforced concretejournal article10.1016/S0963-8695(00)00061-X2-s2.0-0035313663WOS:000167430600008http://ntur.lib.ntu.edu.tw/bitstream/246246/106742/1/08.pdf