摘要
基于电化学快速锈蚀混凝土梁的静载试验,分析了相同类型5片锈蚀钢筋混凝土梁在各级荷载下的裂缝特征,证明了构件裂缝分布具有分形特性,在此基础上,利用分形理论研究了锈蚀钢筋混凝土梁开裂及破坏过程,讨论了裂缝分维数与荷载、跨中挠度及钢筋锈蚀率的关系.试验结果表明:随着试验梁上作用荷载的增加,构件裂缝的分维数逐渐增大;极限荷载下锈蚀钢筋混凝土梁裂缝的分维数随着钢筋锈蚀率的增加而减小.
Based on the static test about the electrochemical accelerated corrosion reinforced concrete beams, the cracking characteristics of the five type reinforced concrete beams under different load levels are analyzed. It is verified that the cracks of beams present the fractal behavior. After the fractal geometry is used to investigate the cracking and failure process of the corroded reinforced concrete beams, the relationships between the fractal dimension of cracks and load, mid span deflection, the reinforcement corrosion rates are discussed. The experimental investigation shows that the fractal dimension of cracks enlarges with the increase of loads on beams, the fractal dimension of cracks on ultimate load decreases with the increase of corrosion rates.
出处
《交通科学与工程》
2010年第1期29-34,共6页
Journal of Transport Science and Engineering
基金
国家自然科学基金项目(50878031)
交通运输部西部交通建设科技项目(200631800019)
湖南省应用基础重点项目(06FJ2008)
关键词
钢筋混凝土梁
锈蚀
裂缝
分形
分维数
reinforced concrete beam
corrosion
crack
fractal
fractal dimension
