肋间距超限钢筋与混凝土间粘结强度试验  

Experiment on Bond Strength Between Steel and Concrete with Overrun Rib Spacing

作　　者：孙昊[1] 李继超[1] 甘丹[2] 

机构地区：[1]长安大学公路学院,陕西西安710064 [2]重庆大学土木工程学院,重庆400045

出　　处：《建筑科学与工程学报》2016年第2期107-113,共7页Journal of Architecture and Civil Engineering

基　　金：中央高校基本科研业务费专项资金项目(2014G1211002,2014G12210003)

摘　　要：为分析肋间距超限对钢筋与混凝土间粘结强度的影响，共制作了36个钢筋肋间距超限试件和合格试件，进行了对钢筋肋外形特征变化比较敏感的中心拉拔试验；通过中心拉拔试验结果的对比，分析了2类试件在破坏模式、荷载一位移曲线、承载力和粘结强度方面的差异。研究结果表明：所有试件破坏时只发生了钢筋粘结滑移破坏和混凝土劈裂破坏，钢筋均未达到屈服强度；2类试件破坏承载能力相差9％～15％，且离散性相对较小；2类试件粘结强度相差小于12．4％；在满足锚固长度和搭接长度的前提下，钢筋肋间距超限10％左右对钢筋与混凝土间粘结强度基本没有影响。In order to analyze the influence of overrun rib spacing on bond strength between steel and concrete, 36 specimens with overrun and standard rib spacing were manufactured. The pull- out tests which were sensitive on the shape characteristics of steel rib were carried out. The failure mode, load-displacement curve, carrying capacity and bond strength were analyzed by comparing the pull-out test results. The test results show that all specimens only appear bond slip failure and concrete splitting failure. The strength of all steels cannot reach their yield strength. The carrying capacity difference of the two types of specimens is 9%-15%, and the discreteness is relatively small. The bond strength of the two types of specimens differs by less than 12. 4%. There is no effect on bond strength of concrete and steel when the rib spacing overruns about 10% while they are satisfied the anchorage length and lap length.

关 键 词：钢筋 混凝土 粘结强度 肋间距超限 拉拔试验 破坏模式 承载能力 

分 类 号：TU375[建筑科学—结构工程]