摘要
为确定轴向拉伸荷载作用下高强柔性索环与超高性能混凝土(UHPC)的临界锚固长度,综合考虑材料类别、锚筋和高强柔性索环直径等参数,对高强柔性索环与UHPC的黏结锚固性能进行了理论分析。提出了试件分别发生混凝土锥体拔出破坏、黏结滑移破坏、混凝土全截面破坏和高强柔性索环断裂破坏时的临界锚固长度计算方法。结果表明:在轴向拉伸荷载作用下,小直径钢绞线和高强柔性索环与普通混凝土发生黏结滑移破坏时的最大临界锚固长度理论值约为21.2 d和20.4 d;与普通混凝土相比,小直径钢绞线和高强柔性索环与UHPC黏结的最大临界锚固长度理论值可减少至10.5 d和6.2 d;当高强柔性索环采用UHPC时,高强柔性索环在发生黏结滑移破坏时可能会发生混凝土锥体拔出破坏。
In order to determine the max anchorage lengths between the high-strength flexible cable loop and ultra-high performance concrete(UHPC)under axial tensile load,the bond and anchorage behavior between high-strength flexible cable loop and UHPC was studied theoretically considering the influence of material category,anchorage bars and high-strength flexible cable loop diameter,etc.In addition,the theoretical methods of max anchorage length were proposed for specimens with concrete cone failure,bond slip failure,steel strand fracture failure and full section failure of concrete.The results showed that when the normal concrete was adopted,the max anchorage lengths for steel strand and high-strength flexible cable loop with bond-slip failure mode were approximately 21.2 d and 20.4 d under axial tensile load.Compared with the normal concrete,the max anchorage lengths for steel strand and high-strength flexible cable loop with bond-slip failure mode would be decreased to 10.5 d and 6.2 d when the UHPC was adopted.The concrete cone failure may be observed when the specimens were designed with bond-slip failure mode between high-strength flexible cable loop and UHPC.
作者
雷红兵
党隆基
庞瑞
陈莉
杨金鹏
李旭东
耿佩
LEI Hong-bing;DANG Long-ji;PANG Rui;CHEN Li;YANG Jin-peng;LI Xu-dong;GENG Pei(China Construction Seventh Engineering Division Corp.Ltd.,Zhengzhou 450004,China;School of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China;CSCEC Zhongyuan Architectural Design Institute CO.,LTD.,Zhengzhou 450004,China)
出处
《河南城建学院学报》
CAS
2023年第4期8-17,共10页
Journal of Henan University of Urban Construction
基金
国家自然科学基金(52278172)
河南省重点研发与推广专项(科技攻关)项目(232102321075)
中国建筑第七工程局有限公司科技研发课题(CSCEC7b-2021-Z-17)。
关键词
高强柔性索环
UHPC
黏结滑移
锚固长度
理论分析
high-strength flexible cable loop
ultra-high performance concrete
bond slip
anchorage length
theoretical analysis
