Experimental Study And Finite Element Analysis Of Seismic Performance Of Precast Concrete Stub Columns

Precast concrete structure has the advantages of the shorter construction period,the finer quality,less affected by the weather,the better environments,and the reduction of manpower in construction site.It also has the merits in fine fireproof performance,low cost as well as high stiffness of components,compared with steel structures.Although the short columns have always become the main destroyed components in the earthquake disaster,it is common in high-rise buildings, large stadiums and bridges.This paper mainly studies the stress state of the precast concrete short columns under low cyclic loading and has done the brief introduction.And we completed 6 precast concrete short column specimens seismic test,according to the experimental hysteretic curves and skeleton curves,and comparative analyse the short columns, the bearing capacity of the specimen,stiffness degradation coefficient,strength degradation coefficient ductility coefficient and the situation of energy consumption.This paper also uses finite element software ABAQUS-6.12 to study the test performance of prefabricated short columns under low reversed cyclic loading,and compared with the experiment results.Induction of experimental phenomena and data and software analysis.The following conclusions can be obtained.1、Connect the embedded corrugated sleeve insertion type precast concrete column and foundation, the seismic performance of the precast column connection is better than the overall pouring columns.This method can be applied to reinforced concrete prefabricated structure.2、When specimens with cast-in-situ or with precast had a unbounded treatment to the column root of longitudinal reinforcement, the bearing capacity of short column will have a significant reduction,while ductility and energy dissipation capability will see no obvious improvement.3、As for precast specimens, whether column root longitudinal reinforcement and concrete have undergo bonding process, when its axial compression ratio reduced, the bearing capacity of the specimen will decline significantly,while its ductility and energy dissipation capacity get no obvious change.4、From the analysis of the finite element software,we can see that it is the best for enhancing the horizontal carrying capacity of precast concrete short column to improve the strength grade of concrete.The research results can provide reference for seismic design and experimental study of prefabricated concrete short columns.In order to pave the way for further research on this kind of precast concrete structure.