钢筋钢丝网砂浆加固混凝土柱的轴压性能-结构工程专业论文.docxVIP

汕头大学硕士学位论文 汕头大学硕士学位论文 II II Abstract In order to keep the advantages of the RC columns strengthened with wire mesh-mortar and to increase the load bearing capacity of the strengthened RC columns significantly, a thought of strengthening RC columns with steel bar / wire mesh mortar was proposed. Twelve steel bar / wire mesh mortar-strengthening columns and three steel bar mortar-strengthening columns were produced for a comparative experimental study under axial load. The influences of the number of the layers of mesh on the axial bearing properties of the strengthened columns were investigated. The research results indicated that, because of the superior separation of the reinforcement, wire mesh could effectively confine mortar cover, and make wire mesh-mortar failed with the core concrete simultaneously, and the cracks are fine and dense. Therefore, the method of strengthening RC columns with steel bar / wire mesh mortar not only could increase the ultimate compressive bearing capacity of the RC columns significantly, but also could keep their distinct ductility and the advantage easy to be constructed. The results also showed that the number of layers of mesh influenced the ductility of the strengthened columns obviously. Since to strengthen RC columns with FRP is very popular, twelve FRP strengthening RC columns were produced for a comparative experimental study with steel bar / wire mesh mortar-strengthening columns. The results showed that, in regard to increasing the load bearing capacity, the method with FRP had higher efficiency and easier construction; however, the method with steel bar / wire mesh was superior in ductility, durability and heat resistance, and it is obviously low cost. Finally, proper material constitutive models for RC columns strengthened with steel bar / wire mesh mortar were proposed and verified by the nonlinear finite element program ABAQUS against experimental data. Via the numerical analyses, the influence of the wire spacing a