Experiments On Seismic Behavior Of Prestressing Steel Strip Constraint Strength Concrete Composite Columns

The reinforced concrete structure is the civil engineering industry of the mainstructure form, while the column plays a vital role as the main load-bearing componentof the reinforced concrete structure,. With the increasingly high demand for buildingstructures, building structures gradually to the top, a large cross-direction, and thisrequires column is higher carrying capacity and better seismic performance, thecomposite column improve the bearing capacity and seismic performance withoutincreasing the section size; the main failure of the concrete structure is thedevelopment of cracks within the concrete, therefore, the use of composite columns byprestressed constraint not only limits the development of cracks in concrete, butconcrete strength, so that the composite column will performance more sufficiently.Under the constraint of prestressed reinforced concrete columns and reinforcedconcrete columns by five prestressed strip confined reinforced concrete,contrast thefailure process, failure pattern, the main research on strip pitch, strip layers of thereinforced bearing capacity of concrete columns, and analyzed the mechanism ofaction of the strip confined concrete components and binding components of thebearing capacity of the different parameters formula to establish the relationship of thestrip active confined concrete and ductility.Through pseudo-ststic experiment on the six composite column with Prestressedstrip constrained combination, comparing the failure modes, hysteresis curve, thedisplacement ductility factor, the skeleton curve, energy dissipation, stiffnessdegradation and strain variation between composite columns and composite columns in the prestressed constraints, analysis of the stirrup spacing, strip spacing of the seismicperformance of composite columnsThe results show that the prestressing steel strip can effectively improve the axialbearing capacity and deformation characteristics of reinforced concrete columns; thesmaller steel spacing,the greater bearing capacity increased,while steel belt has a lowinfluence. prestressed constrained combination of the column can effectively improvethe ultimate deformation capacity and energy performance of the composite column;can slow down the rigidity degeneration phenomenon when reaching the limatebearing capacity; prevent buckling of longitudinal reinforcement due to concretespalling, limit the development of the protective layer of concrete crack width,increasing the ductility of the structure.