- 摘 要
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（1 長江大學工程技術學院， 荊州 434020； 2 長江大學城市建設學院， 荊州 434023）
［摘要］為了研究鋼管截面厚度、鋼纖維摻量和養(yǎng)護溫度對鋼管RPC界面粘結強度的影響，選擇鋼管截面厚度（分別為3，3-5，4mm）、鋼纖維體積摻量（分別為0%，1%，2%，3%）和養(yǎng)護溫度（（20±2）℃標準養(yǎng)護、夏季常溫養(yǎng)護、60℃蒸汽養(yǎng)護）作為參數(shù)，制作了39個鋼管RPC試件。對試件進行推出試驗，得到了24個試件的荷載-位移曲線和鋼管的縱向、橫向應變-位移曲線。通過對試驗結果分析得出：鋼管RPC的受力分為初始階段、摩擦滑移階段和破壞階段，界面作用力由化學粘附力、機械咬合力和摩擦力組成；鋼管截面厚度對初始滑動荷載的影響比較小，對界面粘結破壞荷載的影響比較大；增加鋼纖維摻量是提高鋼管RPC界面粘結破壞荷載的一個有效措施；養(yǎng)護溫度對初始滑動荷載的影響大于對界面粘結破壞荷載的影響。
［關鍵詞］鋼管活性粉末混凝土； 截面厚度； 鋼纖維； 養(yǎng)護溫度
中圖分類號：TU398-9文獻標識碼：A文章編號：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
*長江大學工程技術學院科學研究基金項目“鋼管RPC界面粘結強度試驗研究”（2018KY12），湖北省自然科學基金項目（2019CFC904）。
作者簡介：魏科豐，碩士，副教授，Email:wkfcd@qq.com。
