钢结构桥梁疲劳2019年度研究进展

State-of-the-art review of fatigue of steel bridge in 2019

钢结构桥梁具有轻质、高强、跨越能力大、易工厂化制造和便于装配化施工等突出优点,是未来一段时期中国桥梁工程的重要发展方向。但由于服役环境、荷载条件和交通需求、结构体系和构造细节设计等诸多因素的影响,其疲劳问题突出,已成为制约钢结构桥梁可持续发展的世界性难题。作为桥梁工程的热点研究课题,学者们在钢结构桥梁疲劳领域进行了卓有成效的研究,现聚焦钢结构桥梁疲劳损伤演化与服役性能劣化机理、钢结构桥梁疲劳抗力评估与预测、钢结构桥梁疲劳裂纹监测与检测方法、疲劳开裂加固与维护技术等方面,对2019年度的研究进展和下阶段的研究重点进行扼要的梳理和总结。分析了钢结构桥梁疲劳关键问题研究方面的挑战,具体讨论了在钢结构桥梁疲劳失效机制、疲劳抗力评估新理论新方法、疲劳损伤智能监测与检测和疲劳开裂加固关键技术等方面开展深入研究的迫切需求和主要问题。

Steel bridge has outstanding advantages,such as high ratio of strength to weight,large spanning ability,easy to factory manufacturing and assembly construction,which is an important direction of future development in bridge engineering in China.However,due to the effects of multiple factors such as service environment,load conditions,traffic demand,structural system and structural detail design,fatigue is a critical issueand has become a worldwide problem restricting the sustainable development of steel bridge.As a hot research topic of bridge engineering,considerable efforts from the field of steel bridge fatigue have been done.This paper focuses on reviewing the latest research progress in the aspects of fatigue damage evolution,service performance degradation mechanism,fatigue resistance assessment and prediction,fatigue crack monitoring and detection methods,fatigue crack reinforcement and maintenance technology of steel bridge made by the domestic and foreign scholars,and briefly summarizes the research progress in 2019 and research focus of the next stage of the steel bridge.The paper analyzes the challenges of research on the key fatigue problems of steel bridge,and discusses in detail the urgent needs and major problems for further development in the aspects of steel bridge fatigue failure mechanism,the new evaluation theory and method for fatigue resistance,the steel bridge fatigue damage of the intelligent monitoring and detecting,and the key technology for steel bridge fatigue cracking reinforcement.