In this study vulnerable areas to fatigue crack are studied and a methodology to determine the order of inspection area is developed in order to apply NDT technique which is local inspection method to steel bridge. Through laboratory and field tests f...
In this study vulnerable areas to fatigue crack are studied and a methodology to determine the order of inspection area is developed in order to apply NDT technique which is local inspection method to steel bridge. Through laboratory and field tests for AE technique, noise filtering technique and source location method is established, and the technology to detect crack and its activity is developed. In addition, database which can be used for the diagnosis and monitoring of cracks is established by the analysis of fatigue crack propagation and AE crack signal. In UT technique, sizing and characterizing skills of cracks in steel bridge are developed. An improved bridge safety evaluation method which can reflect the effect of crack is proposed and systemized inspection procedure is presented. The applied loading level for AE test is also presented. In addition, a bridge safety maintenance system using AE monitoring system is proposed.