Research On Seismic Performance Of Strengthening RC Joints With CFRP Under Holding Loads

Carbon fiber(CFRP), because of high tensile strength, easy construction, good toughness, corrosion resistance, does not change the size of the structure and components after reinforcement. It is widely used in the field of structural reinforcement, but the strengthening of the structure before unloading out difficult, or even impossible for some. If we do not consider the impact of load holding reinforcement design, seismic performance and load carrying capacity is likely to overestimate reinforcement structure. So far, domestic and foreign carbon fiber(CFRP) of reinforced concrete structures and components reinforcement mainly on columns, beams, plates and other components hierarchically, and the mechanical properties of the nodes have done some research, and carbon fiber(CFRP) study on seismic behavior of concrete reinforced with fewer nodes, considering the secondary load(load holding) under the carbon fiber(CFRP) study on seismic behavior of reinforced concrete reinforcement node is less.Therefore, we consider the characteristics of the holding loads CFRP reinforced concrete under seismic performance, using the large finite element software ABAQUS to establish reasonable numerical model RC node, and primary and secondary by cyclic load under the action CFRP reinforced concrete under the force of more than 20 joints model has been calculated, and research and analysis of the seismic performance parameters has been carried out.Research indicates some results as follows:(1) Plastic concrete compressive stress and tensile stress and stress level of holding loads CFRP Reinforced Concrete joints are higher than the one under the action of the concrete.(2)Holding loads ratio, steel ratio of column section, concrete strength, reinforcement ratio of column section, column stirrup encrypted area volume ratio of reinforcement, beams linear stiffness ratio, carbon fiber thickness parameters play an important role in seismic performance under holding loads CFRP Reinforced Concrete Effect. Column yield strength of steel grade holding loads under CFRP Strengthened RC seismic performance node is not obvious.(3) As holders of the load ratio increases, the stress level becomes large plastic concrete,CFRP carbon fiber sheet to reduce stress on the contrary. It shows that the larger the load ratio hold Seismic Performance CFRP Reinforced concrete node worse.(4) Holding loads has little influence on CFRP strengthened reinforced concrete slabs reinforced, beam longitudinal reinforcement and stirrups, stirrups and column longitudinal reinforcement.