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为研究钢-竹界面黏结应力与滑移分布,设计了两种类型的界面:型钢与竹板仅通过胶黏剂粘贴的单纯胶结型界面以及在胶黏剂粘贴基础上用螺钉加强的复合胶结型界面,并进行6个钢-竹组合试件的推出试验,得到黏结界面的剪切承载力及外贴竹板的应变。通过力学分析推导出外贴竹板正应力二阶微分方程,结合边界条件与数据拟合解得外贴竹板正应力表达式,并建立了钢-竹界面剪应力与相对滑移计算式,在此基础上提出了短期荷载作用下的钢-竹界面承载力计算方法。试验与理论分析结果表明:钢-竹界面剪切黏结性能良好,复合胶结型界面试件的破坏具有显著的延性特征;外贴竹板正应力试验值与拟合值吻合度高,以此为基础计算剪应力与相对滑移较为可靠;钢-竹界面剪应力与相对滑移分布具有两端大中间小的特征,且竹板受力端黏结界面的剪应力和滑移量明显大于黏结基体受力端黏结界面,剪应力最大值约为1.64 MPa;钢-竹界面剪切黏结承载力计算值与试验值吻合较好,其计算误差小于8%。
In order to study the bond stress and slip distribution of steel-bamboo interface, two types of interface were designed: the simple cement-type interface between steel plate and bamboo board only through adhesive and the composite cement reinforced with screws on the basis of adhesive Type interface, and the launch of six steel - bamboo combination of test specimens to get the shear strength of the bonded interface and the outer paste bamboo strain. Based on the mechanics analysis, the normal stress second-order differential equation of the externally bonded bamboo slab is deduced. The normal stress expression of the slab is obtained by fitting the boundary conditions and the data fitting. The formula of shear stress and relative slip between the steel and bamboo is established. On this basis, the calculation method of bearing capacity of steel-bamboo interface under short-term load is proposed. The experimental and theoretical analysis results show that the shear bond behavior of steel-bamboo interface is good, the ductility of the composite cemented interface specimen has significant ductility characteristics; the normal stress test value of the externally bonded bamboo plate is in good agreement with the fitted value, which is The calculated shear stress and relative slip are more reliable in the foundation calculation. The interfacial shear stress and relative slip distribution of steel-bamboo interlayers have the characteristics of large and middle small at both ends, and the shear stress and slippage of the bonded interface at the force- The maximal shear stress is about 1.64 MPa at the cemented interface, and the calculated value of the shear bond strength of the steel-bamboo interface is in good agreement with the experimental one. The calculated error is less than 8%.