The Study On Seismic Performance Of Top Story Frame Joints On T-shaped Column With High Strength Reinforced Concrete

With the rapid development of society economy and technology,the people’s living standards are constantly improving.In order to meet the demand of residents for residential structure,the traditional multi-story residential frame system needs to be reformed,which leads to the emergence of special-shaped column structure system.By contrast,The special-shaped column structure system effectively solves the problems such as the incompleteness of the indoor space and the nonfluency of sight line,meanwhile,the indoor available area is increased.Based on the research results of seismic behavior of T-shaped column frame joints used high-strength building materials.The crack development,shear deformation of joints and strain of stirrups in HRCJT-2 specimens under cyclic loading are studied.According to the failure characteristics of the test specimens,the simulation results are compared with the experimental results to verify the rationality of the parameter setting of the finite element method.Then a further research is made on the seismic performance of top-story frame joints.In this paper,24 finite element models were established,and respective simulation analysis was made on the five main influence factors:concrete strength,stirrup ratio of core area,ratio of height to thickness of column leg,beam section height and diameter of beam longitudinal bar.And studied their influences on the three seismic performances:shear bearing capacity of joint,hysteretic energy capacity and deformation capacity.It is concluded that the stress-strain constitutive model is applicable to the high-strength concrete confined by high-strength stirrup,Additionally,the height of beams and the diameter of longitudinal ribs are the key factors that affect the seismic performance of the joints.