玄武岩纤维增强水泥基材料与BFRP筋的黏结性能研究

Bonding Performance of Basalt Fiber Reinforced Cementitious Materials With BFRP Bar

文中利用中心抗拔试验研究了玄武岩纤维增强复合材料(BFRP)筋和玄武岩纤维增强水泥基材料(BFRCM)的黏结滑移性能,分析了筋材种类、基体种类、筋材直径、锚固长度对黏结性能的影响,在此基础上,提出了BFRP筋和BFRCM的三阶段黏结滑移本构模型。结果表明,BFRP与混凝土的黏结强度高于钢筋,BFRP筋与砂浆的黏结强度略小于与混凝土的黏结强度,BFRP筋直径和砂浆中的纤维体积掺量均与黏结强度呈反比。此外,分析显示黏结滑移曲线可分为微滑移段、滑移段、下降段和残余段,利用CMR模型上升段、连续曲线模型下降段和GFRP/钢绞线复合筋模型的残余段建立了BFRP筋-BFRCM的高精度黏结滑移模型。该研究为BFRP筋和BFRCM的工程应用提供了重要的研究基础。

This study investigates the bond-slip performance of basalt fiber reinforced polymer(BFRP) bars and basalt fiber-reinforced cementitious matrix(BFRCM) materials through central pull-out tests.The effects of bar type,matrix type,bar diameter,and anchorage length on bond performance are analyzed.Based on these findings,a three-stage bond-slip constitutive model for BFRP bars and BFRCM was proposed.Results indicate that the bond strength between BFRP and concrete exceeds that of steel bars,with the bond strength between BFRP bars and mortar slightly lower than that between BFRP bars and concrete.Moreover,the BFRP bar diameter and the fiber volume fraction in the mortar exhibit an inverse relationship with bond strength.Additionally,further analysis reveals that the bond-slip curve comprises micro-slip,slip,descent,and residual stages.Utilizing the ascending segment of the CMR model,the descending segment of the continuous curve model,and the residual segment of the GFRP/steel strand composite bar model,a high-precision bond-slip model for BFRP bars and BFRCM is established.This study provides a crucial research foundation for the engineering application of BFRP bars and BFRCM.