利用可控摇摆提高土-结构体系的性能
Performance Enhancement of Soil-Structure Systems Using a Controlled Rocking
摘要：
在过去的十年中，基于性能的设计（PBD）在地震岩土设计规范中的应用越来越受到关注。强烈的振动（例如，地震荷载）可能产生隆起或浅基础与下面土壤的部分分离。为了最大限度地减少损坏并保持上部结构免受振动的影响，可以利用受控摇摆。本文采用有限单元法研究了地基岩土材料的非线性特性对土-结构体系摇摆特性的影响。为了更好地了解土-结构体系的摇摆特性，考虑了地基模拟岩土材料的非线性弹塑性特性。其次，参数研究，使用范围广泛的岩土材料与不同的刚度值，进行根据高层结构与不同的配置。研究结果表明，浅基础的转动行为消耗了大部分输入能量，特别是对于软土地基上的结构。
英文摘要：
Application of performance-based design (PBD) in earthquake geotechnical design codes has been gaining attention for the past decade. Strong vibrations (e.g., earthquake loading) may generate an uplift or a partial separation of shallow foundations from the underneath soil. To minimize the damage and keep the superstructure safe from the vibrations, a controlled rocking can be exploited. In this study, a finite element method is used to investigate the effect of nonlinear behavior of foundation geomaterial on the rocking behavior of soil-structure systems. To get a better insight about the rocking behavior of the soil-structure system, nonlinear elastic-perfectly plastic behavior is considered for the simulated geomaterial of the foundation. Next, a parametric study, using a wide range of geomaterials with different stiffness values, is conducted in accordance with high-rise structures with different configurations. The results indicate that a significant proportion of the input energy is dissipated by deploying rotational behavior of shallow foundations especially for the structures on softer geomaterials.
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