【摘要】 为研究FRP型材-混凝土界面抗剪性能与设计计算方法,针对规范推荐的胶接FRP剪力键形式,从细观角度,取胶层为计算分析对象,推导出粘结胶层所受剪应力分布规律的解析解。依据界面连接材料的强度准则,对界面存在的3种失效模式(胶层剪切破坏、FRP剪力键直剪破坏、混凝土板局部压碎)提出界面承载力计算模型。对2根跨度为2 600mm、高度为300mm的FRP工字梁-混凝土板组合梁进行试验,试验结果表明:所提出的FRP型材-混凝土组合梁的界面承载力计算公式与试验结果吻合良好,能够较准确地预测胶接FRP剪力键的抗剪承载力及界面破坏类型。更多还原

【Abstract】 To study the interface shear performance and the related design and calculation methods for the sectional FRP-concrete composite beam bridge,the binding layer of the bridge was taken as the object for calculation and analysis and the analytical solution to the shear stress distribution law of the binding layer was derived from the angle of microscope according to the bound FRP shear connectors as recommended in the code.In compliance with the strength criterion of the interface binding material,the calculation model for the interface bearing capacity of 3 types of the interface failure modes(e.g.the shear failure of the binding layer,direct failure of the FRP shear connectors and local crushing of the concrete slab)was proposed and 2composite beams made up of the FRP I-beams and concrete deck slabs with span length being 2 600mm and depth 300mm were tested.The results of the test indicate that that the calculations of the proposed formulae for the interface bearing capacity of the sectional FRP-concrete composite beams are agreeable with the results of the test and the formulae can correctly predict the shear capacity and the interface failure modes of the bound FRP shear connectors.更多还原