Test And Finite Element Analysis Of High-Strength Concrete Column Confined By CFRP Under Eccentric Load And Horizontal Load

With developing of our country, the structure of concrete building is becoming more and more complex, and require that the strength of concrete is better. As a result, high-strength concrete is widely used in civil engineering. However, brittleness of concrete become more and more obvious, deformability of structure become weak and destruction of structure is abruptly with increasing of concrete strength. Adopting Fiber-Reinforced Polymer (FRP) to strengthen high-strength concrete structure may effectively cancel the defect that ductility and deformability of concrete structure is weak. So, it will have important engineering value and widespread application prospect. According to above problems, the main aspects of the research work are as follows:(1) By the destruction test to 14 columns in compression, it is studied that carbon fiber-reinforced polymer improves the bearing capacity and deformability of high-strength concrete column under eccentric load. Such design parameters, as eccentricity ratio, quantity and bundling form of carbon fiber-reinforced polymer, loading history, and space of straps are considered as the factor effecting test result. Test result suggests that the bearing capacity and deformability of concrete columns under eccentric load have varied degree of advance after confining with carbon fiber-reinforced, bundling form of carbon fiber-reinforced polymer have obvious effect to test result, quantity of carbon fiber-reinforced polymer have weak effect to test result of small eccentricity specimens, however , bearing capability and deformability of big eccentricity specimens have obvious change with increasing of quantity of carbon fiber-reinforced polymer.(2) Numerical simulation is done to every specimen in test by the finite element program of ANSYS. Making use of General Postprocessor of ANSYS , we can gain some valuable formations ,such as distribution chart of crack of concrete at some time,equivalent stress contour of concrete and fiber-reinforced polymer at failure point,the stress-strain curve of concrete and loading-stress curve of reinforcement bar. By analyzing these formations, it may be approved that the calculation result aggresses well with the test result. This proves that the model of finite element and analysis method in this paper are rational. The calculation result of ANSYS may be used as theoretical reference to strengthen engineering. (3) Shearing capacity of high-strength concrete column confined with CFRP is studied by test and finite element analysis. Such design parameters, as actual axial load, quantity and bundling form of carbon fiber-reinforced polymer, are considered as the factor effecting test result. Result of test and finite element analysis shows that shearing capacity and deformability of high-strength concrete column confined with CFRP have obviously advanced.