钢-FRP混合配筋转换梁结构抗震性能有限元分析

Finite element analysis of the seismic performance of transfer beam structures with hybrid reinforcement of steel-FRP bars

开展4榀不同配筋方式的转换梁结构拟静力试验,并分析各榀试件的滞回曲线、骨架曲线和刚度退化曲线等抗震性能。采用OpenSees中基于刚度法的宏观梁柱纤维单元,选取适宜的本构材料并考虑筋材的黏结滑移,建立合理的转换梁结构数值分析模型,将数值模拟和试验结果进行比较,最后进行抗震性能参数分析。结果表明:混合配筋试件具有良好的抗震性能,数值分析模型能较好地模拟出滞回曲线的捏缩效应,对特征状态下的荷载值模拟精度较高;增大混凝土强度或者柱纵筋配筋率对试件ZHL-4抗震性能有利,而墙肢轴压比的提高将不利于试件ZHL-4抗震性能。

This paper presents a study in which four specimens of transfer beam structures,each reinforced using different methods,were tested under pseudo-static loading.The analysis focused on the hysteretic curves,skeleton curves,and stiffness degradation curves of these specimens.A numerical analysis model for the transfer beam structure was established using the macro beam column fiber element based on the stiffness method in OpenSees,considering a suitable material constitutive model and the bond-slip of reinforced materials.The results from the numerical simulations were compared with experimental data to validate model accuracy.Results show that the specimens with hybrid reinforcement demonstrated good seismic performance.The numerical model accurately simulated the pinching effect observed in the hysteresis curves and provided high accuracy in the load values at characteristic states.Further analysis showed that increasing the concrete strength or the longitudinal reinforcement ratio of the column improved the seismic performance of specimen ZHL-4.Conversely,increasing the axial compressive ratio of the wall is harmful to the seismic performance of specimen ZHL-4.