Research On Reinforcement Concretes Component's Dynamic Performance By The Method Of Enlarging Sections

The old building's reinforcement is one of emerging professions in the present architectural engineering, and the concrete structure approximately composes above 50%. So the research on reinforcement concretes component's dynamic performance and improvement the construction craft methods about new and old concretes junction plane, and consummation computation theory and method are one of important topics in the present domestic and foreign structural engineering discipline.This article researches on concretes component's dynamic performance by the tradition method of enlarging sections and the improved method of enlarging sections through the structure low frequency cyclic loading test and the numerical simulation method, and the research indicate: Comparing with the tradition method of Enlarging sections, Reinforcement concrete column's the dynamic performance have enhanced greatly through the improvement method of enlarging sections, and the ductility is enhanced by approximately 17%, energy dissipation capacity is enhanced by approximately 14.7%, the yield capacity is enhanced by approximately 23%, the ultimate capacity is enhanced by approximately 17%, the reason lies in plants reinforcement bar's the wooden key function, Strengthening new and old concretes joint operation ability; It suggests that the new concretes and the longitudinal reinforcement intensity reduction coefficient carries on in the formula, the value in 0.95～0.96; Because the experiment mainly occurs squash destroys or the bending destroys in the base of column ,it suggests that the base of planting reinforcement bar should intensified, the spacing is between 100mm~150mm; The test sample's new and old junction plane processing and construction craft method can guarantee that the new and old junction plane had the good bonding properties.The above research results have definite reference value for the new and old concretes coordination's dynamic performance, and perfecting the structure design standard of concrete structure. It also can supply consult for the design and construction of the reinforcement and modification engineering.