| Beam-column joint is composed of core of joint and beam-column adjacent. Joint is the hinge for structure of RC frame to transfer forces, and it depends on the truss, the diagonal strut mechanisms and the confinement mechanism to resist shear force transferred from beam and column.Joint deformation contains shear deformation and slip of longitudinal reinforcement passing through joint. But in this paper shear deformation is mainly taken into account, and slip of longitudinal reinforcement passing through joint is considered just by modifying its rigid matrix of the joint shear element when its effect is important.The deformation caused by shear deformation have a small proportion of the total deformation of structure when it is on elastic state , but have a large proportion when it is on elastic-plastic state especially for the joints which don't be checked for their seismic shear or endure high ratio of shear force to concrete compressive force.At present, joint is generally considered rigid when we have a analysis and calculation on seismic shear of joint. In fact, the absolute rigid joint is impossible; especially when joint is endure the effect of seismic forces. So it is very important to consider the effect of joint shear deformation on structure.In this paper, the resilience model between joint shear force and joint shear deformation is established on the base of the model of Tekeda and a lot of reference and data. Four factors that concrete intensity, axial compression ratio, shear compression ratio, hoop reinforcement ratio are considered in the model of joint shear deformation.For the above resilience model of joint element, its program is also worked out with Visual Fortran. Then, the joint element program is linked with the main program NDAS2D which is developed by my tutor, Wang Yi-qun. Subsequently, some experimental structure model is computed by this program. By comparing with the test results, the program of joint element is proved to accord with the results on the whole.
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