doi:10.16186/j.cnki.1673-9787.2023040001

Received:2023-04-02

Revised:2023-05-29

Online Date:2023-11-29

Experimental study on pullout performance of prestressed threaded barembedded with anchor plate（Online）

LIU Junli1, PEI Tianshi1, AN Yongchang2, LIANG Tao2, CHEN Jun3, ZHENG Yan1

1.School of Civil and Architectural Engineering， Guilin University of Technology， Guilin  541004， Guangxi，China;2.Guangxi Guitong Engineering Management Co.， Ltd.， Nanning  530029， Guangxi，China;3.College of Civil Engineering and Mechanics， Xiangtan University， Xiangtan  411105，Hunan， China

Abstract:In order to improve the anchorage performance of prestressed threaded steel bars with anchor plates in reinforced concrete slabs or foundations. Taken the effective anchorage length， the presence or absence of sleeve， the width of the anchor plate and the number of structural reinforcement as the test parameters， the pull-out test was carried out on 7 specimens. The failure characteristics of the specimen were studied， and the load-displacement curve， ultimate pull-out capacity， cracking load， yield point stiffness and load-strain curve of the specimen were analyzed. The test results show that the cracking load of the specimen with sleeve was 3.66 times higher than that of the specimen without sleeve. Based on the test results and the results of related literature， the test values of the specimens whose failure type was anchorage zone concrete failure were compared with the calculated values， The formula suggested by Nilforoush， formula 6.5.1-1 of "Code for Design of Concrete Structures" and formula 9.2.11 of Japanese JSCE code was 19%， 17% and 10% lower than the test value， respectively. The above results was enlightened to the use of sleeves to effectively slow down the protruding ribs on the surface of prestressed threaded steel bars to cause spall of concrete or slow down the development of cracks on the surface of concrete specimens； It was safer to use formula 6.5.1-1 of "Code for Design of Concrete Structures" to calculate the uplift bearing capacity， and it could also avoid the waste of prestressed threaded steel bars due to excessive anchorage length.

Key words:anchor plate;sleeve;prestressed threaded steel baranchorage performance

CLC：TU375;TU511.32