考虑材料损伤累积的型钢高强混凝土框架节点数值建模及参数分析
Numerical Modeling and Parameter Analysis of Steel-reinforced High-strength Concrete Frame Joints Considering Damage Accumulation of Materials

为研究地震作用下损伤累积对型钢高强混凝土框架节点抗震性能的影响，基于5榀型钢高强混凝土框架节点低周反复加载试验结果，分析节点构件损伤累积过程及其对刚度和强度的影响。从材料自身损伤入手，通过引入刚度影响系数考虑循环荷载作用下混凝土的单边效应，对Faria-Oliver本构模型进行改进，进而建立适应于型钢混凝土结构的材料损伤累积本构模型。同时基于该模型采用ANSYS分析软件对地震作用下的型钢高强混凝土框架节点进行数值分析，并与试验结果进行对比分析。结果表明：采用本文建立的材料损伤累积本构模型能较好地反映地震作用下型钢高强混凝土框架节点的损伤特性。在此基础上，进一步分析构件轴压比、配箍率、配钢率等设计参数对型钢高强混凝土框架节点抗震性能的影响。研究成果可为该类结构构件的抗震设计提供理论和技术支撑。
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