（1 长江大学工程技术学院， 荆州 434020； 2 长江大学城市建设学院， 荆州 434023）

［摘要］为了研究钢管截面厚度、钢纤维掺量和养护温度对钢管RPC界面粘结强度的影响，选择钢管截面厚度（分别为3，3-5，4mm）、钢纤维体积掺量（分别为0%，1%，2%，3%）和养护温度（（20±2）℃标准养护、夏季常温养护、60℃蒸汽养护）作为参数，制作了39个钢管RPC试件。对试件进行推出试验，得到了24个试件的荷载-位移曲线和钢管的纵向、横向应变-位移曲线。通过对试验结果分析得出：钢管RPC的受力分为初始阶段、摩擦滑移阶段和破坏阶段，界面作用力由化学粘附力、机械咬合力和摩擦力组成；钢管截面厚度对初始滑动荷载的影响比较小，对界面粘结破坏荷载的影响比较大；增加钢纤维掺量是提高钢管RPC界面粘结破坏荷载的一个有效措施；养护温度对初始滑动荷载的影响大于对界面粘结破坏荷载的影响。

［关键词］钢管活性粉末混凝土； 截面厚度； 钢纤维； 养护温度

中图分类号：TU398-9文献标识码：A文章编号：1002-848X(2019)22-0101-07

Experimental study on interfacial bond strength of reactive powder concrete-filled steel tube

Wei Kefeng1， Jia Shanpo2， Gao Yuan2

(1 College of Technology & Engineering,Yangtze University, Jingzhou 434020, China；2 School of Urban Construction,Yangtze University, Jingzhou 434023, China)

Abstract:Thirty-nine reactive powder concrete-filled steel tube specimens were manufactured in order to study the effect of section thickness, steel fiber content and curing temperature on the interfacial bond strength of reactive powder concrete-filled steel tube. The section thickness (3, 3-5 and 4mm), steel fiber content (0%, 1%, 2% and 3%) and curing temperature (standard curing at (20±2)℃, room temperature curing in summer, and steam curing at 60℃) were selected as test parameters. Push out test was carried out on the specimen. The load-displacement curves of specimens and the longitudinal and transverse strain-displacement curves of 24 specimens were obtained. Through analysis on experimental results, it is concluded that the mechanical process of reactive powder concrete-filled steel tube can be divided into initial stage, friction slip stage and failure stage. The interfacial force consists of chemical adhesion force, mechanical occlusion force and friction force. The influence of the thickness of steel tube section on the initial sliding load is relatively small, and the influence on the ultimate failure load is relatively large. Increasing the steel fiber content is an effective measure to improve the ultimate failure load at the interface of reactive powder concrete-filled steel tube. The effect of curing temperature on initial sliding load is greater than that on ultimate failure load.

Keywords:reactive powder concrete-filled steel tube; section thickness; steel fiber; curing temperature

*长江大学工程技术学院科学研究基金项目“钢管RPC界面粘结强度试验研究”（2018KY12），湖北省自然科学基金项目（2019CFC904）。

作者简介：魏科丰，硕士，副教授，Email:wkfcd@qq.com。