Experimental And Theoretical Research On Mechanical Behaviors Of CFRP-PCPs Composite Reinforced Concrete Eccentric Compression Columns

In order to solve the corrosion problem in the process of using reinforced concrete structure, replacing steel bars with fiber tendons was a effective way. Carbon fiber reinforced polymer prestressed concrete prisms was a prestressed composite which proposed by our research group, made by carbon fiber reinforced plastics and ultra-high performance concrete, prestressed carbon fiber reinforced plastics with pretensioning method. Prestressed composites component effectively overcame the defects of steel corrosion, which improved the bearing capacity of it. At the same time as the composite components, composite reinforcement combined and played the advantage of two kinds of materials. The deflection and the crack width of composite reinforced concrete structure is smaller than carbon fiber reinforced concrete structure.Therefore, composite tendons have good prospects of application in civil engineering.The composition of CFRP-PCPs was different from carbon fiber reinforced plastics or steel bars, so stress analysis, calculation of bearing capacity, deflection, crack and bonding behavior of CFRP-PCPs composite reinforced concrete beams and columns were also different from reinforced concrete or carbon fiber reinforced concrete components. In view of experimental and theoretical study on the mechanical behavior of composite reinforced concrete simply supported beams and continuous beams achieved initial success. In order to promote the wide application of composite reinforcement in concrete structure, Theoretical study on the mechanical behavior of composite reinforced concrete columns were particularly necessary. So, the main work in this paper is as follows:(1) Completed six composite reinforced concrete beams test. Through the test, elaborated the failure phenomena of specimens draw and discussed the relationship of beam specimen load and composite reinforcement strain, the relationship of beam specimen load and concrete strain, the relationship curve of load and deflection, made a systematic analysis on the bond properties of composite tendons and concrete, including solved the bond stress between composite reinforcement and concrete, discussed the influences of the bonding properties between composite reinforcement and concrete and drew the stress slip curve of composite reinforced concrete. Comparison of test results, verified the accuracy of theoretical calculation.(2) Tested mechanical behaviors of 17 CFRP-PCPs composite reinforced concrete eccentric compression columns. Through the test, investigated the effect of steel reinforcement ratio, section dimension of CFRP-PCPs composite reinforcement, control stress for prestressing, eccentricity and slenderness ratio. Through the test results, summarized the stress level of the test columns, simply analyzed the relationship of ultimate bearing capacity and CFRP steel strain and the relationship of ultimate bearing capacity and the lateral deformation of columns. Abstractly analyzed effects of composite reinforced concrete eccentric compression column bearing capacity considering different factors, including damage characteristics of composite reinforced concrete eccentric compression columns, analysis of the ultimate bearing capacity of columns and analysis of second-order effect on composite reinforced concrete eccentric compression columns. Comparison of test results, verified the accuracy of theoretical calculation.