铝合金板-混凝土界面粘结-滑移性能双面剪切试验研究

Double-sided shear experimental study of bond-slip performance of aluminum alloy plate-concrete interface

铝合金板具有强度高、耐蚀性及延性好等优点,可用于潮湿、高寒等复杂恶劣环境中混凝土结构的加固,但铝合金板-混凝土的界面性能是影响铝合金板加固混凝土结构效果的关键。进行48个铝合金板-混凝土试件的界面双剪试验,分析铝合金板厚度、铝合金板粘结长度及结构胶种类对界面破坏机理、剥离承载力、粘结剪应力及滑移演化规律的影响。结果表明:增加铝合金板厚度、铝合金板粘结长度以及采用低弹性模量的结构胶能有效提高界面的剥离承载力,但铝合金板粘结长度应控制在有效粘结长度范围内;试件的滑移量随着粘结长度的增加而增大,且铝合金板越厚,试件的滑移量越小。将双直线模型、双曲线模型、Nakaba模型计算结果与试验结果进行对比分析,Nakaba模型与铝合金板-混凝土粘结滑移曲线整体吻合较好。

Aluminum alloy plate has the advantages of high strength,good ductility,good corrosion resistance,which can be used to strengthen concrete structures in damp,cold and harsh environments.However,the interface performance of aluminum alloy plate-concrete is the key factor which affect the effect of concrete reinforced by aluminum alloy plate.Based on this,the interfacial double shear tests of 48 aluminum alloy plate-concrete specimens were completed.The influence of bond thickness of aluminum alloy plate,bond length of aluminum alloy plate and structural adhesive type on the interface failure mechanism,interfacial peeling bearing capacity,bond shear stress and the slip evolution were analyzed.The results show that the peeling capacity of the interface can be effectively improved by increasing the thickness of the aluminum alloy plate,the bonding length of the aluminum alloy plate and using the structural adhesive with low elastic modulus,but the bonding length of the aluminum alloy plate should be controlled within the range of the limited bonding length.At the same time,with the increase of bond length,the slip of specimen increases,and the thicker the bond thickness of aluminum plate,the lower the slip of the specimen.Use double-line model,hyperbolic model,Nakaba model and test results for comparative analysis.The results show that the aluminum alloy plate-concrete bond slip is in good agreement with the curve of the Nakaba model.