往复荷载作用下锈蚀钢筋与混凝土黏结性能研究  

Study on bond behavior between corroded steel bar and concrete under effect of reciprocating load

作　　者：周俊浩 商怀帅[1] ZHOU Junhao;SHANG Huaishuai(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《建筑结构》2024年第1期119-123,137,共6页Building Structure

基　　金：国家自然科学基金面上项目(52378245);山东省自然科学基金重大基础研究项目(ZR2022ZD33);青岛市科技惠民示范专项项目(23-2-8-cspz-9-nsh)。

摘　　要：采用梁式试件进行25次往复荷载(25%、45%和65%极限荷载)作用下锈蚀钢筋(理论锈蚀率为2%、4%和6%)混凝土间黏结性能试验研究。结果表明:钢筋混凝土梁式试件均发生劈裂破坏;钢筋混凝土间的滑移在前十个往复荷载循环周期内基本完成,而后试件加载前后滑移差逐渐缩小,滑移量基本不再增加;在试件所受荷载等级一定时,试件加载端与自由端钢筋混凝土间的滑移随着锈蚀率增加而增大;而控制纵筋的锈蚀率不变,试件纵筋与混凝土之间自由端和加载端的滑移量随着荷载等级的提高而增加明显;往复荷载等级对于试件滑移量的影响较钢筋锈蚀相比更加明显。The bond behavior between corroded steel bars(theoretical corrosion rate is 2%,4%and 6%)and concrete under 25 reciprocating load(25%,45%and 65%ultimate load)has been investigated by using beam specimens.The test results show that reinforced concrete beam speeimens showed splitting damage the slip between steel bar and concrete was basically completed within the first ten reciprocating load cycles,the slip value difference before and after loading of the specimen is gradually reduced,and the amount of slip basically no longer increased.When the load level of the specimen kept constant,the slip between the steel bar and concrete at the loading end and the free end of the specimen increased with the increase of the corrosion rate;while the corrosion rate of the control steel bar remains unchanged,the slip between steel bar and concrete at the loading end and the free end increased significantly with the increase of the load level.The impact of the reciprocating load level on the slip of the specimen was more obvious than that of steel corrosion.

关 键 词：黏结性能 钢筋混凝土 往复荷载 加速锈蚀 锈蚀率 梁式试件 滑移 

分 类 号：TU375.1[建筑科学—结构工程]