先装拔出法检测配筋RPC抗压强度试验研究  

Experiment of technical specification for test of reinforced RPC column strength by cast-in-place pull-out method

作　　者：卜良桃[1] 宋扬逸 BU Liangtao;SONG Yangyi(School of Civil Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《西安建筑科技大学学报（自然科学版）》2019年第2期192-197,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家火炬计划(2013GH561393);国家自然科学基金项目(51278187)

摘　　要：本试验采用先装拔出法检测配筋活性粉末混凝土(RPC)强度.试件分为RPC120,RPC150,RPC180三种强度等级,每个强度等级包含4组配有纵筋和箍筋的RPC试件(每组RPC试件的纵筋间距不相同,分别为25 mm,50 mm,75 mm,100 mm)和1组无配筋的素RPC试件以及相应的立方体抗压试块,箍筋间距一致.采用圆环支承式的拔出仪进行试验,并利用最小二乘法进行试验数据拟合以及回归分析.试验表明,拔出力与RPC试件的强度呈良好的线性关系.当纵筋间距小于50 mm时其拔出力明显大于素RPC试件的拔出力;当纵筋间距大于75 mm,其拔出力与素RPC试件的拔出力几乎相当.本文还从破坏机理的角度分析了钢筋对拔出力的影响,为今后的试验研究和工程实践提供参考依据.An experiment using cast-in-place pull-out method is conducted to test the strength of reinforced reactive powder concrete (RPC) columns. The components are divided into 3 strength grades: RPC120, RPC150, and RPC180.Each strength grade level consists of 4 RPC columns installed with longitudinal reinforcements and stirrups and 1 plain RPC column without steers which contain a corresponding number of test cubes. All components have the same stirrup spacing. A circle bracing device was used in this experiment. The least square method is used to fit the experimental data and do regression analysis. Text results have indicated that there is significant liner correlation between the pull-out force and the compressive strength of reinforced RPC columns. The pull-out force of the reinforced RPC column is greater than the plain RPC column when the longitudinal reinforcement spacing is less than 50mm. But when the longitudinal reinforcement spacing is more than 75mm, the pull-out force of them is the same. This paper has analysed the influence of steels on the pull-out force from the angle of failure mechanism, and also provides reference for experimental investigations and filed applications.

关 键 词：先装拔出法 配筋RPC柱 最小二乘法 回归分析 破坏机理 

分 类 号：TU192[建筑科学—建筑理论]