考虑FRP筋实际受力的粘结滑移试验方法研究  

Study on Bond-Slip Test Method under Considering of FRP Bar Actual Stresses

作　　者：孙丽[1] 王超[1] 杨泽宇 张春巍[2] 乔丕忠 SUN Li;WANG Chao;YANG Zeyu;ZHANG Chunwei;QIAO Pizhong(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Civil Engineering,Qingdao University of Technology,Qingdao,China,266033)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]青岛理工大学土木工程学院,山东青岛266033

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第1期10-16,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52078310,51878420);辽宁省“兴辽英才计划”-科技创新领新人才项目(XLYC1902038)。

摘　　要：目的基于Losberg试验和双筋对拉试验提出一种研究FRP筋粘结滑移性能的试验新方法-四筋对拉试验,以得到更准确的FRP筋与混凝土之间的粘结滑移本构关系。方法考虑FRP筋实际受力状态,同时拉拔四根FRP筋,分析不同试验方法、FRP筋直径、粘结长度对FRP筋与混凝土之间粘结性能的影响。结果四筋对拉试验与Losberg试验和双筋轴心对拉试验粘结滑移曲线趋势相似;四筋对拉试验数据的离散性较小,标准试件粘结长度为5 d、直径为12 mm,四筋对拉试验粘结应力比Losberg拉拔试验和双筋对拉试验下粘结应力降低了18%和3%;试件的破坏形式主要为GFRP筋肋剪切破坏以及肋间混凝土剪切破坏。结论与传统试验方法相比,四筋对拉试验方法与结构的实际受力情况更符合,得到的数据结果更精准,可以作为研究FRP筋粘结滑移性能的一种新方法。Based on the Losberg pull-out test and the double-bar symmetric pull-out test,a new test method to study the bond-slip mechanism of FRP bar is symmetric pull-out test.Then considering the actual stress of FRP bars,four FRP bars are pulled at the same time,and the influence of different test methods,FRP bar diameter and bond length on the bond performance between FRP bars and concrete are analyzed.The test results show that the curves trend of quadratic-bar symmetric pull-out test are similar to that of Losberg pull-out test and the double-bar symmetric pull-out test,the discreteness of the data in the quadratic-bar symmetric pull-out test is small.Theoretical analysis of the test results indicate that FRP bar with a diameter of 12 mm,the bond stress of quadratic-bar symmetric pull-out test is 18%and 3%lower than that of Losberg pull-out test and double-bar symmetric pull-out test when the bond length is 5 d.The failure mode is the slight damage of the rid surface,and the shear of the concrete between the ribs of the GFRP bar.Through comparison between the quadratic-bar symmetric pull-out test and the tradition pull-out test,quadratic-bar symmetric pull-out test is more in line with the actual force of the structureand the data obtained is more accurate.The double-bar symmetric pull-out test can be used as a test method for bond-slip FRP bar.

关 键 词：FRP筋 四筋对拉试验 双筋对拉试验 Losberg拉拔试验 

分 类 号：TU391[建筑科学—结构工程]