Study On Ductility Performance Of Concrete Column Reinforced With GFRP Bars

When the reinforced concrete structures are in corrosive environment,not only steel bars in the original package in concrete are corroded gradually resulting from the existence of the appearance of concrete cracks,but also due to the presence of iron rust,caused by concrete cracking and spalling is more serious.Because of the corrosion of steel bar,the safety performance of reinforced concrete structure is reduced to a great extent.When steel corrosion reach to a certain extent,the strength of steel will be greatly reduced,resulting in huge economic losses to the community,and bring great security risks.In order to eliminate the corrosion problem,the researchers put forward the use of inorganic fiber reinforcement(FRP bar)instead of steel bar in concrete structure.At present,there are a lot of static analysis of FRP reinforced concrete structure at home and abroad,but the dynamic analysis and the research on the seismic design of FRP reinforced concrete structures and members are not enough.For this reason,this paper carries on the research on the seismic performance of GFRP reinforced concrete structure and finite element analysis,and analysis of ductility calculation theory.In the second chapter of this paper,the experimental study of GFRP reinforced concrete eccentric compression column with rectangular section under static load is carried out.The test results show that: before the specimen failure,the column has a large lateral displacement,the crack is bigger,there are certain signs,the component has a certain ductility.Based on the test results,the comparison of three methods for calculating the ductility is made.In the third chapter,by using the finite element software ABAQUS on the experimental conditions of GFRP reinforced concrete eccentric column stress properties of finite element simulation of different concrete model and without considering the bond slip effect,comparative analysis,and comparison with different parameters,and the results are compared with the experimental data.In the fourth chapter,using ABAQUS software to finite analysis of GFRP reinforced concrete columns under low cyclic loading,the simulation results are analyzed,the performance of GFRP reinforced concrete column is mainly affected by the axial compression ratio and stirrup spacing,and the simplified calculation method of GFRP reinforced concrete columns of the restoring force model and its characteristics parameter.Finally,the future research direction was prospected.