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Equivalent linearization of non-linear soil-structure systems

机译：非线性土-结构系统的等效线性化

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摘要

The concept of equivalent linearization, in which the actual nonlinear structure is replaced by an equivalent linear single-degree-of-freedom (SDOF) system, is extended for soil-structure systems in order to consider the simultaneous effects of soil-structure interaction (SSI) and inelastic behavior of the structure on equivalent linear parameters (ELP). This is carried out by searching over a two-dimensional equivalent period-equivalent damping space for the best pair, which can predict the earthquake response of the inelastic soil-structure system with sufficient accuracy. The super-structure is modeled as an elasto-plastic SDOF system whereas the soil beneath the structure is considered as a homogeneous half-space and is replaced by a discrete model. An extensive parametric study is carried out for a wide range of soil-structure systems subjected to a suite of 59 ground motions. The effect of SSI on ELP is studied through introducing a set of non-dimensional key parameters, which define the soil-structure system. It is shown that ELP of soil-structure systems result from a trade-off between SSI effect and nonlinear behavior of the structure. The contribution of each of these two factors depends on the characteristics of the soil-structure system which, in turn, are defined by the introduced non-dimensional key parameters. Moreover, the reliability of the predicted response of soil-structure systems and its sensitivity to deviation from optimal ELP is studied in detail, which sheds light on the consequences of using improper pairs of ELP for interacting systems in the framework of performance-based design of structures.
机译：等效线性化的概念（其中实际的非线性结构被等效线性单自由度（SDOF）系统替代）被扩展到土壤-结构系统，以考虑土壤-结构相互作用的同时影响（ SSI）和结构在等效线性参数（ELP）上的非弹性行为。这是通过在二维等效周期等效阻尼空间中搜索最佳对来实现的，可以最佳地预测非弹性土-结构系统的地震响应。超级结构被建模为弹塑性SDOF系统，而结构下方的土壤被视为均匀的半空间，并被离散模型取代。针对经历了59次地面运动的一系列土壤结构系统进行了广泛的参数研究。通过引入一组定义土壤结构系统的无量纲关键参数，研究了SSI对ELP的影响。结果表明，土壤-结构系统的ELP是由SSI效应和结构的非线性行为之间的权衡产生的。这两个因素各自的作用取决于土壤结构系统的特征，而土壤结构系统的特征又由引入的无量纲关键参数定义。此外，详细研究了土壤结构系统预测响应的可靠性及其对偏离最佳ELP的敏感性，这为基于性能的设计框架中使用不合适的ELP对相互作用的系统带来了后果。结构。

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