Abstract:To investigate the effect of damage accumulation on the seismic behavior of steel-reinforced high-strength concrete (SRHSC) frame joints under earthquake, five groups of SRHSC frame joints under low cyclic loading tests were studied, and the damage accumulation process and its effects on the stiffness and strength of the frame joints were analyzed. This study begins with the modeling of material damage. First, the unilateral effect of the concrete under a cyclic load is considered by introducing the stiffness influence coefficient, and then the Faria-Oliver constitutive model is improved to establish a material damage cumulative constitutive model adapted to the steel-reinforced concrete structure. Based on the material damage constitutive model, a refined numerical analysis model was established for seismic SRHSC frame joints using ANSYS. Compared with the hysteretic curves of SRHSC frame joints under low cyclic loading, the results show that the cumulative damage model can reflect the damage characteristics of SRHSC frame joints under seismic loading. The influences of the parameters of axial compression ratio, stirrup ratio, and steel ratio on the seismic behavior of SRHSC frame joints were further analyzed. The research results can provide theoretical and technical references for the study of the cumulative damage of similar SRHSC frame joints under earthquake.