高强钢绞线网-聚合物砂浆加固RC梁的端部剥离破坏研究

Research on Debonding Failure at Plate-end of RC Beams Strengthened with High Strength Steel Wire Mesh and Polymer Mortar

从高强钢绞线网-聚合物砂浆加固层与混凝土构件之间的粘结破坏层出发,分析了高强钢绞线网-聚合物砂浆加固的RC梁端部剥离破坏机理,结合已有的试验研究,考虑各种应力的综合作用效应,提出了集中荷载和均布荷载作用下端部剥离破坏正应力计算公式、剪应力计算公式;同时,基于粘结破坏层的剪切粘结强度和正拉粘结强度,提出了端部剥离破坏准则;最后建立了剥离承载力计算公式,并和试验数据进行了对比。结果表明:公式计算值与试验结果符合良好,可用于实际工程计算。

In view of debonding failure layer between the reinforcing layer of high strength steel wire mesh and polymer mortar and the concrete members,the mechanisms of debonding failure at the plate-end of the RC beam strengthened with high strength steel wire mesh and polymer mortar were analyzed.On the basis of existing test results,considering the composite action of all kinds of stresses,the calculation formulas of the normal debonding stress and the shear bond stress of the plate-end of the RC beam under the concentrated load and uniform load were established.At the same time,based on the shear bond strength and the normal bond strength of the bond failure layer,the debonding criteria of plate-end of RC beam were proposed.Finally,the corresponding calculation formula of debonding bearing capacity was established and comparisons between the calculation values and tested results were carried out.Results show that the calculation values for the debonding bearing capacity agree well with the test results and can be applied to calculation of practical construction.