荷载作用下开裂钢筋混凝土梁锈胀开裂模式及锈蚀分布研究  

Crack shape and rust distribution in corrosion-induced cracking concrete coupled with load

作　　者：王雪松[1] 金贤玉[1] 金南国[1] 田野[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058

出　　处：《建筑结构学报》2013年第11期151-157,共7页Journal of Building Structures

基　　金：国家高技术研究发展计划(863计划)项目(2012AA050903);国家自然科学基金项目(50838008;51178413)

摘　　要：为提高混凝土结构的服役性能,对混凝土保护层的锈胀开裂过程进行研究。对荷载作用下锈蚀18个月的内掺氯盐钢筋混凝土梁的截面锈胀裂缝分析发现:环向裂缝宽度沿径向呈指数函数变化;锈胀裂缝的开裂模式、锈蚀产物与钢筋混凝土受力状态、骨料及裂缝的相对位置均密切相关;保护层破坏以层状破坏为主。通过研究提出,在对锈蚀钢筋混凝土梁进行承载力分析时,建议剪压区不考虑受压混凝土保护层的作用,对剪拉区和弯拉区钢筋与混凝土之间的黏结性能要进行折减。To enhance the service performance of concrete structures, the cracking process of concrete cover due to corrosion of reinforcement was studied. Through the analysis on the corrosion cracks in the reinforced concrete beam corroded for 18 months under loads whose concrete was mixed with chlorides, it can he concluded that the circumferential crack width has an exponential relationship with the radius. The cracking pattern and corrosion products are closely related with the stress state of reinforced concrete and the relative position between cracks and aggregates. The concrete cover mainly spalls off in layers. It can be concluded from this research that, in the analysis of working capacity of corroded reinforced concrete beam, the capacity of concrete cover at the compression edge in the shear compression zone should be ignored. And the bonding capacity between corroded steel bars and concrete should be reduced.

关 键 词：钢筋混凝土梁 氯盐侵蚀 开裂模式 锈蚀物分布 

分 类 号：TU528[建筑科学—建筑技术科学]