局部锈蚀对钢筋混凝土梁承载性能的影响  

Effect of Local Corrosion on Load Carrying Capacity of Reinforced Concrete Beam

作　　者：杨晓明[1] 王耀耀[1] 陈永林[1] 吴天宇[1] 

机构地区：[1]辽宁工程技术大学建筑工程学院,阜新123000

出　　处：《硅酸盐通报》2016年第8期2365-2370,2377,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金项目(51008148);辽宁省教育厅2013年杰出青年学者成长计划(LJQ2013037)

摘　　要：局部锈蚀钢筋混凝土构件的承载性能及破坏形态与均匀锈蚀构件相比有很大差异,本文采用数值模拟方法对钢筋混凝土梁在跨中锈蚀、端部锈蚀、单侧锈蚀等情况下的受弯性能展开研究。研究结果表明:跨中锈蚀导致的粘结力损失对于混凝土梁承载力并无较大影响,但是会降低锈蚀构件的抗弯刚度;两端锈蚀导致的粘结力损失会严重影响钢筋在混凝土中的锚固效果,当锈蚀率较大时会导致锚固失效,使结构材料远未达到屈服强度构件就不能继续承担荷载;单侧锈蚀的钢筋混凝土梁,当锈蚀段在距离加载点附近时,且位于粘结应力较大值区段的起始位置处,对钢筋混凝土梁的承载性能影响最大。The performance of bearing and mode of failure of reinforced concrete component with local corrosion is obviously different with these components with even corrosion. In this paper, the bending performance of reinforced concrete beam with local corrosion at middle span, two ends and left half span are investigated by numerical simulation. The results show that the lost of bonding due to the corrosion at middle span has little effect on the load carrying capacity of beam but would decrease the stiffness of the beam. The corrosion occurring at two ends of the beam would affect the anchoring of steel bars in concrete. When the corrosion is severe, the anchoring is failure which leads to the beam can l be loaded before the materials reach to yielding strength. Finally, the effect of corrosion at left half span on the performance of reinforce concrete beam is the largest when the corrosion takes place nearby the location of loading and at the start of the region with the maximum bonding strength.

关 键 词：钢筋混凝土梁 局部锈蚀 承载性能 粘结退化 锚固 

分 类 号：TU375[建筑科学—结构工程]