Experimental Study On Seismic Behavior Of Reinforced Concrete Columns With S-Clip Reinforcement

In reinforced concrete buildings and structures, especially in the reinforced concrete bridge piers, middle tie steel bars and staggered hoop reinforcements have been allocated to satisfy demand of anti-seismic performances. And this placing style of steel bars is complicated, difficulet to construction and demanding much money. This paper study a new restrained style of steel bar. Under the precondition of ensuring resist-shear and ductility of reinforced concrete structure, it is easy for allocating steel bars and convenient for construction to use the new type of steel bars substitute the middle tie steel bar or the staggered hoop reinforcement. Because of the new style bar is manufactured from a single steel bar by winding as "S" , so it is called"S-Clip".In order to validate the validity of this reinforcement, 4 big sized piers were made according to the difference of ratio of longitudinal reinforcement. And the resistant capability of the R. C. columns with conventional stirrup contrasted with new type reinforcement by low- cyclic reversed load test for 4 large-scale pier models. Based on the test of reinforced concrete columns, load-displacement curves and stress-strain curves of reinforced concrete columns were presented under the action of low reserved cyclic loads. And explicit cognition was generated about the damage process of reinforced concrete columns. According to the test results, the earthquake resistance was analized on many aspects, such as rigidity,hysteretic behaviors,skeleton curves,ductility factor,energy-dissipation capabilities and so on. The experiment results indicate that the piers with new type reinforcement are not only taken full advantage of the material capability and had the same carrying capacity, but also improved the ductility. The function of S-Clip reinforcement corresponds to the conventional reinforcement, and it is better to restrain the longitudinal reinforcement. In application, the new type of reinforcement can be used in every reinforced construction , especially be the same with the reinforced concrete bridge piers, which endured high loads, allocated excessive steel bars and arranged dense reinforcement caused difficult to tie. So, this technique have extensive prospect. It is very important to research this application technology for the theory of structure and the development of the technology.