Ductility Performance And Seismic Damage Analysis Of The Rectangular Piers With The High-strength Steel Bars

In recent years, natural disasters, especially earthquake disasters are veryfrequent at home and abroad. It has an important effect on building structures.Seismic performance of the structure becomes an important measure of a structure ofoverall quality both bridge pier in transportation engineering and frame structure ofresidential, office buildings. Therefore, the seismic behavior of concrete piersbecomes a major research focus of today’s structure.Currently, large-scale finite element software has been widely used in thestructure analysis of concrete. At home and abroad, many scholars study the seismicperformance of reinforced concrete structure using finite element software extensively.In this paper, by means of finite element software ANSYS, the establishment of areliable and effective ANSYS finite element analysis model to extract hysteresis curve,finite element numerical simulation analysis on ductility performance and seismicdamage for reinforced concrete rectangular piers with different proportion ofhigh-strength steel is conducted.The numerical simulation analysis on ductility of reinforced concrete piers withdifferent proportions of high strength steel has showed that the high-strength steel inconcrete pier has a certain influence on the seismic behavior of the piers; the ductilityand energy dissipation capacity of the piers can be fully guaranteed by the rationalallocation of high-strength longitudinal; if the strength ratio is0.71, the pier ductilityperformance will be the best; due to the stirrup in concrete pier have certainconstraints effect, the ductility of the pier will increase with the increase ofhigh-strength stirrup prestressing degree; when the strength ratio of high-strengthstirrup is0.90, it can meet the seismic requirement for concrete piers.Seismic damage analysis by varying proportion of high strength longitudinal inconcrete rectangular piers dedicated that most of the existing seismic damage model ison the basis of the ordinary reinforced concrete pier and it is very rare on the study of equipped with high strength steel bars in reinforced concrete pier; when the concretepier is in the process of loading, after repeated cyclic loading to inelastic stage, even ifthe ultimate displacement has not been achieved, due to the accumulation of energyloss, the concrete pier will lose its bearing capacity; therefore, a nonlinearcombination model considering structural deformation and energy loss damage isproposed in this paper; compared with other models, the improved damage model isproved more reasonable and reliable when used in the reinforced concrete piers withhigh-strength steel.