刘均利, 裴天师, 安永昌,等.带锚板预应力螺纹钢筋抗拔性能试验研究[J].河南理工大学学报（自然科学版）,2024,43(3):171-180.

LIU J L , PEI T S , AN Y C ,et al.Experimental research on pullout performance of prestressed threaded steel bar with anchor plate[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(3):171-180.

带锚板预应力螺纹钢筋抗拔性能试验研究

刘均利1, 裴天师1, 安永昌2, 梁涛2, 陈俊3, 郑艳1

1.桂林理工大学 土木与建筑工程学院，广西 桂林  541004 2.广西桂通工程管理集团有限公司，广西 南宁  530029 3.湘潭大学 土木工程学院，湖南 湘潭  411105

摘要: 目的 为了探讨直径25 mm、强度等级PSB1080的带锚板预应力螺纹钢筋在有效锚固长150，200，250 mm的钢筋混凝土厚板或基础中拔出时的锚固性能， 方法 以有效锚固长度、套管有无、锚板宽度和构造钢筋数量为试验参数，对7个试件进行抗拔性能试验研究。研究试件的破坏特征，分析荷载-位移曲线、极限抗拔承载力、试件开裂荷载和荷载-应变曲线。  结果 结果表明：试件抗拔承载力随着锚固长度的增加而增加，当有效锚固长度为250 mm时，预应力螺纹钢筋均能达到屈服；混凝土开裂荷载随着有效锚固长度、锚板宽度和套管的增设而增加，构造钢筋数量对面层混凝土开裂荷载的影响并不明显；采用套管试件的面层混凝土开裂荷载比未采用套管试件提高了2.66倍；根据荷载-位移曲线可知，在锚板上增设构造钢筋可以防止带锚板预应力螺纹钢筋拔出时承载力急剧下降；基于试验结果和相关文献结果，对比锚固区混凝土锥体破坏试件的试验值与计算值可知，Nilforoush建议式和日本JSCE规范式9.2.11分别比试验值低19%和10%。 结论 增设套管可以有效提高开裂荷载；使用日本JSCE规范式9.2.11计算抗拔承载力更接近试验值。  

关键词:带锚板;套管;预应力螺纹钢筋;抗拔性能

doi:10.16186/j.cnki.1673-9787.2023040001

基金项目:国家自然科学基金资助项目（52068012）

收稿日期:2023/04/02

修回日期:2023/05/29

出版日期:2024/05/15

Experimental research on pullout performance of prestressed threaded steel bar with anchor plate

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

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

Abstract: Objectives In order to investigate the anchoring performance of prestressed threaded steel bars with a diameter of 25 mm and a strength grade of PSB1080 when pulled out from reinforced concrete thick slabs or foundations with effective anchorage lengths of 150，200，250 mm，   Methods experiments were conducted on 7 specimens with parameters including effective anchorage length，presence of sleeve， width of anchor plate，and number of structural rebars.The failure characteristics of the specimens were studied，and the load-displacement curve，ultimate pull-out capacity， crack load of the specimens， and load-strain curve were analyzed.   Results The pull-out capacity of the specimens increased with the increase of anchorage length，and when the effective anchorage length was 250 mm， all prestressed threaded steel bars could yield； the crack load of concrete increased with the increase of effective anchorage length， width of anchor plates，and the addition of a sleeve， and the influence of the number of structural rebars on the crack load of surface concrete was not significant； the crack load of surface concrete specimens with a sleeve was 2.66 times higher than that without a sleeve；according to the load-displacement curve，it can be seen that adding structural rebars on the anchor plate can prevent the phenomenon of a sharp decrease in load capacity when prestressed threaded steel bars with anchor plates are pulled out； based on the test results and relevant literature， the experimental values of specimens with anchor zone concrete cone failure were compared with the calculated values，Nilforoush’s proposed formula and the Japanese JSCE specification formula 9.2.11，which were respectively 19% and 10% lower than the experimental values.   Conclusions Adding a sleeve can effectively increase the crack load；using Japanese JSCE specification formula 9.2.11 to calculate the pull-out capacity is closer to the experimental values.  

Key words:anchor plate;sleeve;prestressed threaded steel bar;pullout performance