摘要
考虑了钢箱梁疲劳裂纹止裂孔的孔径、位置、角度等参数,建立了线弹性有限元实体模型,得到钢箱梁疲劳裂纹钻孔孔边及沿孔边厚度方向的应力变化,对比了不同参数下钻孔止裂的效果,给出了钻孔止裂修复的影响因素.依据不同打孔参数下孔边应力降低程度,建立了止裂孔参数影响因素的比重关系.研究结果表明:过于增大止裂孔的孔径对止裂效果的提高并不明显;孔边的表面应力比孔内的应力大25%左右,裂纹更容易在表面萌生.分析结果表明:止裂孔的打孔位置应在裂纹边缘中心,并且止裂孔存在偏心或一定角度时,能够改善孔边应力的分布,进一步降低孔边应力的集中,具有更好的止裂效果.
The linear elastic finite-element solid model with crack was established with conslaeranon oi different drilling-hole parameters of diameter, location and angle in steel box girder. The stress variations at the hole-edge and along the thickness direction were obtained, and the effects on stress reduction were compared. The proportion of stop-hole influencing factors was discussed based on different stress reduction in different drilling-hole parameters. The results show that large stop-hole cannot effectively retard crack extension. The stress at the hole-edge is 25% larger than that inside, which indicates that the crack becomes easier to produce at surface. The stop-hole needs to be drilled at the center of crack edge to reduce stress contribution, and the stop-hole with a certain eccentricity or angle can improve stress distribution and effectiveness.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第1期97-102,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(51478163)
江苏省交通科学研究计划项目(2013Y10-1)
关键词
钢箱梁
疲劳裂纹
止裂孔
影响因素
比重
steel box girder
fatigue crack
stop-hole
influencing factor
proportion
