钢箱梁横隔板-纵肋疲劳裂纹气动冲击维修试验

doi:10.13229/j.cnki.jdxbgxb20210420

摘要/Abstract

摘要：

采用气动冲击维修技术对横隔板和纵肋弧形缺口部位疲劳裂纹实施维修，并结合疲劳试验对维修效果进行评估。先后累计开展了11个试件的弯曲疲劳试验，探讨了横隔板和纵肋弧形缺口部位焊缝疲劳性能以及裂纹扩展规律；对比分析了气动冲击维修前、后疲劳裂纹扩展速率以及局部承载能力的变化情况；揭示了气动冲击维修技术对于横隔板和纵肋弧形缺口部位疲劳裂纹的维修效果。研究结果表明：在面外变形作用下，横隔板和纵肋弧形缺口部位的疲劳强度约为46 MPa，低于我国现有规范（JTG D64—2015）中的建议值，并且疲劳裂纹易萌生于焊缝包脚处，主要沿着横隔板母材扩展，呈现出复合型裂纹扩展特征。气动冲击维修后，裂纹均出现了明显的扩展迟滞现象，表明气动冲击维修技术对于抑制该部位疲劳裂纹扩展有显著效果。4年多的工程应用结果也充分验证了本文方法在横隔板和纵肋弧形缺口部位疲劳裂纹维修工作中的有效性。

关键词: 桥梁与隧道工程, 复合型裂纹, 气动冲击技术, 钢箱梁, 疲劳试验

Abstract:

Pneumatic impact technology was used to repair the fatigue crack which initiates from the arc profile of rib-to-diaphragm， and the maintenance effect was evaluated by fatigue test. The bending fatigue tests of 11 specimens were carried out. The fatigue properties and the crack propagation law of the arc profile were discussed. The variation of fatigue crack growth rate and local bearing capacity after pneumatic impact maintenance was analyzed. The maintenance effect of pneumatic impact technology on fatigue crack of rib-to-diaphragm was revealed. The results show that the fatigue strength of the rib-to-diaphragm arc profile is about 46 MPa， which is lower than the recommended value in the Chinese code （JTG D64—2015）， under the action of out-of-plane deformation. This kind of fatigue crack is easy to initiate at the weld cover foot， and mainly propagates along the diaphragm base material， showing the characteristics of composite crack propagation. The cracks of all specimens have obvious growth lag after pneumatic impact maintenance， which indicates that the technology has a significant effect on the suppression of fatigue crack growth in this part. The results of more than 4 years engineering application also verify the effectiveness of the proposed method in the fatigue crack repair of rib-to-diaphragm.

Key words: bridge and tunnel engineering, mixed mode crack, pneumatic impact technique, steel box girder, fatigue test

中图分类号:

U443.32

袁周致远,吉伯海,夏俊元,孙童. 钢箱梁横隔板-纵肋疲劳裂纹气动冲击维修试验[J]. 吉林大学学报(工学版), 2022, 52(12): 2883-2891.

Zhi-yuan YUANZHOU,Bo-hai JI,Jun-yuan XIA,Tong SUN. Pneumatic impact test on rib⁃to⁃diaphragm fatigue crack of steel box girder[J]. Journal of Jilin University(Engineering and Technology Edition), 2022, 52(12): 2883-2891.

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组号	编号	处理方式	名义应力幅/MPa
1	S80N1	不维修	80
1	S80P3~S80P6	气动冲击	80
2	S100N2	不维修	100
2	S100P7~S100P9	气动冲击	100

试件编号	循环次数N/万次
S100N2	102.2
S100P9	366.8
S100PS	346.6
S100S	217.9

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