UHPC-NC组合箱梁顶板界面抗剪性能试验研究  

Experimental study on shear resistance of top plate interface of UHPC-NC composite box girder

作　　者：程菊科 伍贤智 杨树萍[1] 罗晓光 CHENG Juke;WU Xianzhi;YANG Shuping;LUO Xiaoguang(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;China Railway Bridge Research Technology Co.,Ltd.,Wuhan 430034,China;State Key Laboratory of Bridge Structural Health and Safety,Wuhan 430034,China;College of Civil Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]中铁桥研科技有限公司,湖北武汉430034 [3]桥梁结构健康与安全国家重点实验室,湖北武汉430034 [4]湘潭大学土木工程学院,湖南湘潭411105

出　　处：《湘潭大学学报（自然科学版）》2024年第2期123-130,共8页Journal of Xiangtan University(Natural Science Edition)

基　　金：湖北省教育厅科学技术研究计划青年人才资助项目(Q20211305)。

摘　　要：为了研究超高性能混凝土(UHPC)与普通混凝土(NC)组合箱梁的界面抗剪性能,该文设计了3类界面处理方式不同的试件,分别为不处理类、凿毛类、涂缓凝剂+水冲洗类,同时进行了UHPC与NC的组合推出试验,分析3类试件的破坏形态和抗剪性能.试验结果表明:UHPC与NC组合结构进行界面处理后,推出试件的破坏形态为普通混凝土侧的拔出破坏,与界面不处理的破坏形态相同,且各类试件的初始剪切刚度相近.但不同界面处理方式对试件的平均抗剪强度影响较大,进行界面处理后相较于不处理时的平均抗剪强度大幅提高,均为不处理时的4倍以上.To investigate the interface shear performance of combined ultra-high performance concrete(UHPC)and normal concrete(NC)box girder,three types of specimens with different interface treatment methods were designed in this paper,which were respectively untreated,chiseled wool,coated with retarder and washed with water.At the same time,the push-out test of UHPC and NC was conducted to analyze the failure pattern and shear performance of the three types of specimens.The test results show that after the interface treatment of the ultra-high performance composite structures with normal concrete,the failure mode of the specimen is the pull-out damage of the normal concrete side,which is the same as the failure mode without interface treatment,and the initial shear stiffness of all specimens is similar.However,different interface treatment methods have a great impact on the average shear strength of specimens.The average shear strength of specimens after interface treatment is significantly increased compared with that without treatment,and is more than 4 times of that without treatment.

关 键 词：超高性能混凝土 推出试验 界面破坏形态 组合顶板 抗剪性能 

分 类 号：TU37[建筑科学—结构工程]