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首页> 外文期刊>Bulletin of earthquake engineering >Kinematic soil-structure interaction effects on maximum inelastic displacement demands of SDOF systems
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Kinematic soil-structure interaction effects on maximum inelastic displacement demands of SDOF systems

机译：运动土-结构相互作用对SDOF系统最大非弹性位移要求的影响

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This paper presents a statistical study of the kinematic soil-foundation-structure interaction effects on the maximum inelastic deformation demands of structures. Discussed here is the inelastic displacement ratio defined as the maximum inelastic displacement demands of structures subjected to foundation input motions divide by those of structures subjected to free-field ground motions. The displacement ratio is computed for a wide period range of elasto-plastic single-degree-of-freedom (SDOF) systems with various levels of lateral strength ratios and with different sizes of foundations. Seventy-two earthquake ground motions recorded on firm soil with average shear wave velocities between 180 m/s and 360 m/s are adopted. The effects of period of vibration, level of lateral yielding strength and dimension of foundations are investigated. The results show that kinematic interaction will reduce the maximum inelastic displacement demands of structures, especially for systems with short periods of vibration, and the larger the foundation size the smaller the maximum inelastic displacement becomes. In addition, the inelastic displacement ratio is nearly not affected by the strength ratio of structures for systems with periods of vibration greater than about 0.3 s and with strength ratios smaller than about 3.0. Expressions obtained from nonlinear regression analyses are also proposed for estimating the effects of kinematic soil-foundation-structure interaction from the maximum deformation demand of the inelastic system subjected to free-field ground motions.
机译：本文提出了运动学的基础-结构相互作用对结构最大非弹性变形需求的统计研究。这里讨论的是非弹性位移比，定义为承受基础输入运动的结构的最大非弹性位移需求除以经受自由场地面运动的结构的最大非弹性位移需求。对于具有不同水平侧向强度比和不同地基尺寸的弹塑性单自由度（SDOF）系统，计算了宽范围的位移比。在平均剪切波速度在180 m / s和360 m / s之间的坚硬土壤上记录了72次地震地震动。研究了振动周期，横向屈服强度水平和地基尺寸的影响。结果表明，运动学相互作用会减少结构的最大非弹性位移需求，尤其是对于振动周期较短的系统，并且基础尺寸越大，最大非弹性位移就越小。另外，对于振动周期大于约0.3s且强度比小于约3.0的系统，非弹性位移比几乎不受结构的强度比的影响。还提出了从非线性回归分析获得的表达式，以便根据自由场地面运动对非弹性系统的最大变形需求，估算运动学的土-基础-结构相互作用的影响。

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