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近年来，疲劳裂纹在老化结构中的扩展已成为一个严重的问题。发展有效可靠的老化钢结构安全性和结构完整性评估方法是维护计划中必不可少的。本研究以高效能红外线摄影机量测热弹性应力分布与耗能分布及其资料处理为基础，发展一种新的结构完整性评估方法，以发展结构完整性检伤分类。在疲劳裂纹萌生方面，研究了疲劳裂纹萌生过程中的能量耗散机制，用于疲劳极限估算和裂纹萌生点估算。对于疲劳裂纹萌生后的结构完整性评估，热弹性应力分析被应用于疲劳裂纹的检测和裂纹扩展的评估，基于现场载荷条件下的断裂力学参数测定。

Recently, fatigue crack propagation in aged structures has become a serious problem. Development of effective and reliable evaluation methods of safety and structural integrity of aging steel structures are indispensable in maintenance program. In this project, a new method of structural integrity evaluation was developed based on thermoelastic stress distribution measurement and dissipated energy distribution measurement by high-performance infrared camera and their data processing for the development of structural integrity triage. As for fatigue crack initiation, energy dissipation mechanism in fatigue crack initiation process was investigated for fatigue limit estimation and crack initiation point estimation. For structural integrity evaluation after fatigue crack initiation, thermoelastic stress analysis was applied for detection of fatigue crack and evaluation of crack propagation based on fracture mechanics parameter determination under on site loading conditions.