摘要
目的针对后张法预应力混凝土构件中孔道压浆缺陷问题,研究管道材质、缺陷大小、缺陷临界面位置及预应力钢筋位置等主要因素对冲击回波法检测混凝土孔道压浆缺陷结果的影响规律.方法以单层布置的预应力管为研究对象,采用ABAQUS有限元软件对影响因素进行数值模拟计算,并与现场试验进行对比验证.结果结果表明:管道材料对测试结果有影响,金属波纹管比PVC管测试结果误差更小;缺陷大小对频率信号有影响,随着缺陷尺寸的增大,频率信号向低漂移;缺陷临截面位置对测试结果有一定影响,腹板工况下测试难度较大;预应力钢筋对测试结果无影响.结论缺陷大小、缺陷临界面位置对测试结果有一定影响,预应力钢筋对结果无影响.所得结果对压浆孔道检测缺陷提供了一定的技术指导,并为该方向的进一步研究提供相关的理论支持.
Aiming at the problem of tunnel grouting defect in post tensioned prestressed concrete members,the influence of the main factors such as the pipe material,defect size,the position of the defect critical surface position and the position of the prestressed steel bar on the results of the impact-echo method for detecting the concrete tunnel grouting defects is studied.This paper takes the single layer prestressed pipe as the research object.ABAQUS finite element software is used for numerical simulation calculation of the influencing factors,which is verified by comparison with the field test.The results show that the material of the pipe has influence on test results.The test error of metal pipe is less than that of PVC pipe.The defect size has influence on the frequency signal,with the increase of defect size,the frequency signal drifts to low frequency.The location of the critical section of the defect has some influence on the test results,it is difficult to test under the working condition of the web plate.The prestressed steel has no influence on the test results.The defect size and the location of the defect interface have some influence on the test results,while the prestressed steel has no influence on the test results.The results in this paper provides some technical guidance for the detection of defects in grouting tunnels,and provides relevant theoretical support for further research in this field.
作者
杨雅勋
柴文浩
于海波
汪世龙
YANG Yaxun;CHAI Wenhao;YU Haibo;WANG Shilong(School of Highway,Chang′an University,Xi′an,China,710064)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第3期457-464,共8页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51878059)
国家重点研发计划项目(2018YFB1600300)。
关键词
压浆缺陷
冲击回波法
有限元模拟
现场试验
频率信号
grouting defect
impact-echo method
finite element simulation
field test
frequency signal
