This paper presents a parametric study to evaluate the effects of soil-structure interaction (SSI) on the constant-strength inelastic displacement ratios (C_R) of self-centering single-degree-of-freedom (SDOF) systems characterized by flag-shaped hysteretic behavior. The elastic homogeneous soil half-space below the foundation is simulated according to the concept of Cone model. Intensive nonlinear time-history analyses of soil-structure systems are conducted using three sets of 20 synthetic ground motions, which are matched to the design response spectra corresponding to very dense, stiff and soft soil classes. The effects of different parameters (i.e., fundamental period of the fixed-base superstructure, T_fix; strength reduction factor, R; structure-to-soil stiffness ratio, a₀; aspect ratio of the superstructure, s; secondary stiffness ratio, α; and energy dissipation ratio of the flag-shaped model, β) on the inelastic displacement ratios are investigated and discussed. The analysis results indicate that similar trends are generally observed in inelastic displacement spectra with different soil class conditions, and ignoring SSI underestimates the peak inelastic displacement demands of the soil-structure systems. The inelastic displacement ratios increase when the value of R or a₀ increases, while a rise in α or β leads to lower inelastic displacement ratios. It is found that aspect ratio has basically no influence on the inelastic displacement ratios for low a₀ values, while has mitigating and amplifying influence on the inelastic displacement ratios below and above a threshold period for high a₀ values.

本文提出了一项参数研究，以评估土-结构相互作用（SSI）对以旗形为特征的自定心单自由度（SDOF）系统的恒定强度非弹性位移比（C _R）的影响滞后行为。根据Cone模型的概念，模拟了地基下方的弹性均质土的半空间。使用三组20个合成地面运动对土壤结构系统进行了密集的非线性时程分析，这些运动与对应于非常稠密，刚性和软土类别的设计响应谱相匹配。不同的参数（即，固定基座式上层建筑的基本周期，的效果Ť_修复强度折减系数; ř; 结构土刚度比，a ₀；上层建筑的纵横比s；二次刚度比，α；研究并讨论了旗形模型的能量耗散率β）对非弹性位移率的影响。分析结果表明，在不同土类条件下的非弹性位移谱中通常观察到相似的趋势，而忽略SSI会低估土壤-结构系统的峰值非弹性位移需求。非弹性位移比例增加时的值- [R或一个₀增大，而在上升α或β导致较低的非弹性位移比。已经发现，对于低a ₀值，长宽比基本上对非弹性位移比没有影响，而对于高a ₀值低于和高于阈值周期，长宽比对非弹性位移比具有减轻和放大的影响。