钢筋混凝土结构锈胀开裂试验及仿真研究  

Corrosive cracking test and simulation study of reinforced concrete structures

作　　者：赵丹会 张淑华[1] 兰让 周静姝[1] 

机构地区：[1]河海大学港口海岸与近海工程学院,南京210098

出　　处：《水道港口》2017年第1期66-71,共6页Journal of Waterway and Harbor

摘　　要：以高桩码头中腐蚀开裂最具代表性的纵梁作为试验对象,采用加速腐蚀设备对试验梁进行加速腐蚀,应用CT扫描检测技术对切割后的腐蚀开裂梁进行断层扫描,得出锈蚀深度及锈蚀率与裂缝宽度之间的关系。在试验的基础上,基于扩展有限元法,分别改变保护层厚度和钢筋直径,对锈蚀深度与裂缝宽度的关系进行参数敏感性分析,从而推导出锈蚀率与裂缝宽度之间的经验公式。结果表明:保护层厚度越大,抗开裂能力越大;不同钢筋直径对应的锈蚀深度与裂缝宽度间均存在线性关系,但直线斜率并无明显变化;当裂缝宽度小于0.4 mm时,基于仿真研究得到的经验公式与试验结果吻合较好。The longitudinal beam in high pile wharf was chosen to perform the test for its high representative in corrosion cracking. An accelerated corrosion equipment was used to conduct the accelerated corrosion test, when the beam has cracked, it was cut to be scanned by the CT scanning detection technology and the relationship between the corrosion depth or reinforcement corrosion rate and crack width was obtained. On the basis of the experi- ment, parameters sensitivity analysis between the corrosion depth and crack width was studied by changing the di- ameter of rebar and thickness of concrete cover respectively with the extended finite element method, and an empiri- cal formula between corrosion rate and crack width was derived. The results show that： the resistance to cracking grows when the thickness of the protective layer gets larger, for different bar diameters, the corrosion depth and crack width keep a linear relationship with no obvious change in the straight line slope and when the crack width is less than 0.4 mm. the emoirical formula obtained from the simulation agrees well with the test results.

关 键 词：钢筋锈蚀 裂缝宽度 加速腐蚀试验 扩展有限元 

分 类 号：TV332.12[水利工程—水工结构工程]