杜国锋, 曹煊, 谢向东,等.高强钢管超高性能混凝土界面黏结滑移性能试验[J].河南理工大学学报（自然科学版）,2024,43(1):180-188.

DU G F, CAO X, XIE X D, et al.Test of interfacial bond-slip behavior of Ultra-high Performance Concrete filled high-strength steel tube[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(1):180-188.

高强钢管超高性能混凝土界面黏结滑移性能试验

杜国锋, 曹煊, 谢向东, 张继承

长江大学 城市建设学院，湖北 荆州 434023

摘要:目的 为了研究高强钢管超高性能混凝土的黏结滑移性能，方法 考虑径厚比、长径比和钢纤维掺量3个参数的影响，设计并制作15根构件进行试验研究，通过推出试验，得到轴向荷载与加载端位移的荷载-位移曲线，以及高强钢管与超高性能混凝土之间的黏结强度，根据试验结果，对影响黏结强度的参数进行定性定量分析。结果 结果表明：随着高强钢管长径比和径厚比的增加，黏结强度减小；随着钢纤维掺量增加，试件黏结强度先增加后减小，即当钢纤维掺量从1%增加到2%时，黏结强度增加，但当钢纤维掺量从2%增加到3%时，黏结强度反而降低；试件荷载-滑移曲线表现为两种形式，一是有明显的峰值点，峰值点后曲线急速下降（部分出现尾部上升的现象），二是曲线无明显峰值点，拐点后曲线持续缓慢增长。高强钢管超高性能混凝土的黏结破坏分为黏结阶段、滑动阶段和抗摩擦阶段。结论 以长径比、径厚比、含钢率和套箍系数为参数，结合试验数据并对其进行回归分析，得到适用于高强钢管超高性能混凝土黏结强度的计算模型，并将计算结果与试验结果进行对比，计算值与试验值吻合较好，可为实际工程提供一定参考。

关键词:高强钢管;超高性能混凝土;推出试验;黏结滑移;黏结强度

doi:10.16186/j.cnki.1673-9787.2022080020

基金项目:国家自然科学基金资助项目（52078052）

收稿日期:2022/08/11

修回日期:2022/11/28

出版日期:2024/01/25

Test of interfacial bond-slip behavior of Ultra-high Performance Concrete filled high-strength steel tube

DU Guofeng, CAO Xuan, XIE Xiangdong, ZHANG Jicheng

School of Urban Construction，Yangtze University，Jingzhou 434023，Hubei，China

Abstract: Objective In order to study the bond-slip performance between high-strength steel tube and Ultra-high Performance Concrete， Methods the influence of three parameters including the diameter-thickness ratio，length-diameter ratio，and steel fiber dosage is considered.Fifteen specimens are designed and manufactured for experimental research.By conducting experiments，the load-displacement curves of axial load and displacement at the loading end are obtained，as well as the bond strength between high-strength steel tube and ultra-high performance concrete.Based on the experimental results，a qualitative and quantitative analysis is performed on the parameters affecting bond strength. Results The results show that with the increase of length-diameter ratio and diameter-thickness ratio of high-strength steel tube，the bond strength decreases.With the increase of steel fiber dosage，the bond strength of the specimens first increases and then decreases.Specifically，when the steel fiber dosage increases from 1% to 2%，the bond strength increases，but when the steel fiber dosage increases from 2% to 3%，the bond strength decreases.The load-slip curve of the specimens exhibits two types： one with a distinct peak point and a rapid drop in the curve after the peak point （with some cases showing a slight increase in the tail），and the other with a slow and continuous increase in the curve after the inflection point.The bond failure of high-strength steel tube Ultra-high Performance Concrete can be divided into the bonding stage，sliding stage，and anti-friction stage. Conclusion By considering the length-diameter ratio，diameter-thickness ratio，steel content，and hoop coefficient as parameters，and combining the experimental data for regression analysis，a calculation model for bond strength applicable to high-strength steel tube Ultra-high Performance Concrete is obtained.The calculated results are compared with the experimental results，showing good agreement，which can provide a reference for actual engineering.

Key words:high-strength steel tube;Ultra-high Performance Concrete;push-out test;bond-slip;bond strength