Study On Seismic Behavior Of RC Columns With Main Tendon Debonding Technology

In recent years,with the frequent occurrence of global earthquakes,the existing seismic fortification targets can no longer meet the requirements,and the concept of restorability structure is put forward.The goal of the recoverable structure is to make the structure not only to guarantee the safety performance,but also to control its residual deformation,so that the building structure can be repaired quickly after the earthquake and realize the fortification target of "large earthquake repairable".This study proposes the use of a reinforced concrete column using the debonding technique of the main reinforcement.By reducing the adhesion between the reinforcement and the concrete,the structure can be debonded between the reinforcement and the concrete in the stage of large deformation,and the high-strength reinforcement itself can be fully utilized.Due to ductility,the structural deformation can be restored,thereby realizing the self-resetting performance of the column under a large deformation state.In this study,through the theoretical analysis of the debonding mechanism,a reinforced concrete column using the main tendon debonding technique was designed and subjected to a reciprocating loading test.The self-resetting of the column was verified by comparative experiments of different devised length components.The feasibility of capacity is obtained by the effect of the detackification length of the main tendon on the residual deformation and the deteriorating stiffness of the column;through the analysis of the debonding mechanism,the finite element analysis software ABAQUS is used to conduct numerical simulation analysis of the test.Through comparative test results analysis and digital simulation theoretical analysis,it can be seen that the use of detackification technology can effectively improve the catastrophic shear failure of reinforced concrete components,and concentrate the main damage cracks in the debonded length region,improving the components.Ductility;As the length of debonding increases,the yield of steel tends to be retarded,the hysteretic energy of the column increases,the residual displacement decreases,and the repairability of the component increases.Through the study of the seismic performance of reinforced concrete columns using debonding columns,it can be seen that through the use of debonding techniques,it is possible to achieve effective control of residual deformation in columns,structural damage is improved,and column recoverability can be achieved.