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为进一步研究双壁钢箱混凝土组合墩柱(DSCB墩柱)的抗震性能,建立了考虑钢管局部屈曲、内填混凝土约束效应和钢管与混凝土接触作用的DSCB墩柱的精细化有限元模型.首先通过双向拟静力试验结果验证了该有限元模型的准确性;然后采用验证后的有限元模型,研究了钢板宽厚比、长细比、截面宽高比、轴压比等关键参数对DSCB墩柱滞回性能的影响;最后根据试验和有限元分析结果提出了DSCB墩柱的骨架曲线模型.数值模拟分析结果表明:随着钢板宽厚比的增大,DSCB墩柱的峰值强度和弹性刚度减小;随着长细比的增加,DSCB墩柱的峰值强度和弹性刚度明显降低,而极限位移则随之增大.所提出的骨架曲线模型可为DSCB墩柱的抗震性能分析提供参考.
In order to further study the seismic behavior of double-wall steel-concrete composite piers (DSCB pier), a refined finite element model of DSCB pier considering local buckling of steel pipe, confinement effect of filled concrete, and contact between steel pipe and concrete is established. The accuracy of the finite element model is verified by two-way quasi-static test results. Then the finite element model is used to study the influence of the key parameters such as the aspect ratio, the slenderness ratio, the aspect ratio, the axial compression ratio, Finally, based on the experimental results and finite element analysis, the skeleton curve model of the DSCB piers is proposed.The numerical simulation results show that the peak strength and elastic stiffness of the DSCB pier decrease with the increase of the ratio of thickness to thickness The peak strength and elastic stiffness of DSCB pier significantly decrease and the limit displacement increases with the increase of slenderness ratio.The proposed skeleton curve model can provide reference for the analysis of seismic performance of DSCB pier.