FUNDAMENTAL STUDY ON CRACK DETECTION METHOD OF STEEL MEMBERS BY THERMAL LOADNG OVER PAINT COATING

Abstract

Fatigue cracks of steel structures, which may bring significant damage on bridge safety, occur at near welded lines and at around sole plate. Early detection and repair of them can be a key and researches have eagerly been conducted to develop easy defect detection techniques of them. Here, infrared thermography can be a means for inspecting defects and can be considered having potential used in practice. Then in this study, effects of shapes and locations of crack tips on crack detection method using the infrared thermography over paint coating are investigated through heat transfer analysis, and the validity is also verified through heating test of steel members with crack.