锈蚀钢筋混凝土梁性能退化试验和模拟分析  

Experimental and numerical analysis of the performance degradation for corroded reinforced concrete beams

作　　者：马亚飞[1] 许永超[1] 王磊[1] 张建仁[1] 

机构地区：[1]长沙理工大学桥梁工程安全控制省部共建教育部重点实验室,湖南长沙410114

出　　处：《交通科学与工程》2016年第4期55-62,共8页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(51508036);国家重点基础研究发展计划(973计划)项目(2015CB057705);土木工程湖南省优势特色重点学科创新基金项目(15ZDXK05)

摘　　要：为研究不同类型钢筋锈蚀对钢筋混凝土梁抗弯性能的影响,制作了9根螺纹钢筋和9根光圆钢筋混凝土矩形梁,并对其进行电化学快速锈蚀试验,研究不同锈蚀率下2种类型钢筋混凝土梁的荷载-挠度曲线、承载力退化、裂缝发展及破坏模式。考虑锈蚀钢筋与混凝土间的粘结滑移,采用有限元软件MARC,对锈蚀钢筋混凝土梁的破坏过程进行了模拟,并对粘结性退化系数的影响进行了敏感性分析。研究结果表明:锈蚀对光圆钢筋梁承载力退化的影响大于它对变形钢筋梁的;开裂后钢筋与混凝土应变逐步趋于不协调;对于梁端锚固较好的梁,粘结力的变化对梁极限抗弯承载能力的影响不大,但对梁的刚度影响较大;随着锈蚀率的增加,梁的破坏形式逐步由延性破坏转为脆性破坏。本研究的有限元计算值与试验值较为吻合,可为建立锈蚀RC梁承载力理论计算模型提供参考。In order to study the impact of different types of reinforcement corrosion on the flexural performance of reinforced concrete beam, nine deformed and nine plain bar reinforced concrete rectangular beams were manufactured, respectively.An electricity accelerated corrosion test was used in the experimental process.The load-deflection curve, bearing capacity degradation, crack development and failure modes of two types of reinforced concrete beams under different corrosion rates were discussed. Considering the bond-slip between the steel and the concrete, the failure process of corroded reinforced concrete beams was simulated by the finite element software MARC,and a sensitivity analysis on the bond degradation coefficient was also analyzed.The results show that the corrosion has more significant effects on the strength degradation for the beam with plain bars than the beam with deformed steel bars. The strain of the steel and the concrete tended to be uncoordinated after concrete cracking.For the beam with good anchorage at the ends, the change in bond strength had little effects on the ultimate carrying capacity,but had significant effects on the stiffness.The failed type of beams gradually changed from ductile into brittle with the increase of corrosion levels.The calculated results by the finite element method was consistent with the experimental observations, which can provide a reference for establishing a theoretical model in future studies.

关 键 词：桥梁工程 钢筋混凝土 锈蚀 粘结 有限元方法 

分 类 号：U447[建筑科学—桥梁与隧道工程]