Finite Element Analysis On The Interfacial Properties Of High-Strength Concrete Strengthened With CFRP Under Complex Environmental Conditions

In recent years, carbon fiber reinforced polymer (CFRP) is concerned by people because of its advantages such as light weight, high strength, convenient construction and could be used by almost all kinds of materials, and is widely used in the field of structure strengthening, but CFRP reinforced concrete structure are mostly used in outdoor, especially in the north sea environment (chemical erosion, freeze-thaw cycle, sea tide, etc.), makes people have to start to concern about the durability of CFRP reinforced concrete structure.The finite element method is helpful to the study of the Bond Performances of High Strength Concrete Strengthened with CFRP. In this text, based on the background and supported by the Natural Science Foundation of China(51378089), I used ABAQUS6.12, a type of software about finite element analysing, study the Performances of High Strength Concrete Strengthened with CFRP under Complex Environment Conditions, the main contents are as follows:In this text, I took a numerical simulation about the double-sided shear test, made a finite element analysis about the interfacial bond performance between CFRP and high strength concrete under coupling function of sustaining load and freeze-thaw cycle. The simulation results compared with the experimental results, with the increase of freeze-thaw cycles, specimen limit load and ultimate end of the interface bond-slip decreases, this means the freeze-thaw cycle damage the interfacial bond performance, the mainly mode of failure is shearing damage of concrete specimen, continuous load can make the damage degree increased. The strain of CFRP decreased with the increase of freeze-thaw cycles, the effective bond length increased.Making a finite element analysis about the interfacial bond performance between CFRP and high strength concrete under couple action of sustained load and dry-wet cycle was studied. The simulation results compared with the experimental results, with the increase of dry-wet cycles, specimen limit load and ultimate end of the interface bond-slip decreases, this means the dry-wet cycle damage the interfacial bond performance, continuous load can make the damage degree increased. Failure mode was changed by the shift to adhesive failure between resin and concrete from concrete shearing failures the dry-wet cycle increased.