Experimental Study Of The Seismic Perfor-mance Of Composite Reinforced Concrete Beams Of New CFRP-PCPs

The paper relies on the National Natural Science Foundation of “The CFRP-PCPscomposite reinforced concrete beams by force behavior and seismic performance”(51168006), experimental study on seismic performance of the CFRP-PCPs compositereinforced concrete beams. The results show that, the CFRP-PCPs composite bar whichmaintains the CFRP bar’s high tensile strength and durability advantages,also improvesits brittleness, ductility and poor material defects, combined with prestressed role, givingfull use of the material properties of CFRP. Under cyclic loading, the CFRP-PCPscomposite reinforced concrete reinforcement can effectively delay component crackingand crack development, improving the component stiffness, strength, ductility anddeformation capacity, which also has good energy dissipation capacity, excellent seismicperformance. The main research works were as follows:(1)Produced the CFRP-PCPs composite bar according to the own working processand construction,(2)Considering different reinforcement, as well as the different tension control stress,pre-compressive strength and different cross-sectional dimension of the CFRP-PCPscomposite bar, cyclic loading were tested on six concrete beams. Throughphenomenological observation and test data, the force of the composite reinforcedconcrete beams, the paper systemically researched and summarized the phenomenon ofcrack development and testing, failure pattern and mechanism, the crack of hysteresiscurves, skeleton curves, characteristic loads, deformation, restoring force model,deformation resilience, ductility, stiffness contrast and stiffness degradation, energydissipation capacity, viscous damping coefficient.The results show that there are some pinching effect on the hysteresis curve of theCFRP-PCPs composite reinforcement beam and prestressed CFRP Beams, but compositebar ‘s curve is relatively full, which has good energy dissipation capacity; in compositebar components, judging from the forward skeleton curve, specimen PB3has betterstiffness and ultimate bearing capacity, its skeleton curve remained upward trend in thelarge displacement stage; composite tendons components has significant crack resistancenot only in the positive direction, and also greatly improved the crack resistance ofcomponents in the opposite direction; ordinary prestressed CFRP reinforced beam has agood forward concrete cracking, but it also reduces the reverse cracking load; improvingthe composite tendon tension control stress, prestressed and cross-sectional size caneffectively raise the deformation capacity of the components; improving prestressed composite bar and section size can raise the deformation of the components of the abilityto recover, blindly increasing tension control stress leads to reducing deformationrecovery capabilities; composite reinforced concrete beam has higher and more stabledeformation ability to recover than ordinary prestressed CFRP tendons concrete beams,which is favorable to the post-earthquake restoration; increasing the cross-sectionaldimension and prestress of the composite bar will have an adverse impact to ductility.(3) Abaqus finite element analysis software was used to simulate and analyze theforce process of the CFRP-PCPs composite reinforced concrete beams under cyclicloading, and the simulation results were compared with the experimental results,comparative results are in good agreement.