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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Accidental eccentricity in symmetric buildings due to wave passage effects arising from near-fault pulse-like ground motions
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Accidental eccentricity in symmetric buildings due to wave passage effects arising from near-fault pulse-like ground motions

机译：由于近断层脉冲状地震动产生的波通过效应，对称建筑物中的意外偏心率

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This article investigates the characteristics of the accidental eccentricity in symmetric buildings due to torsional response arising from wave passage effects in the near-fault region. The soil-foundation-structure system is modeled as a symmetric cylinder placed on a rigid circular foundation supported on an elastic halfspace and subjected to obliquely incident plane SH waves simulating the action of near-fault pulse-like ground motions. The translational response is computed assuming that the superstructure behaves as a shear beam under the action of translational and rocking base excitations, whereas the torsional response is calculated using the mathematical formulation proposed in a previous study. A broad range of properties of the soil-foundation-structure system and ground motion input are considered in the analysis, thus facilitating a detailed parametric investigation of the structural response. It is demonstrated that the normalized accidental eccentricity is most sensitive to the pulse period (T-P) of the near-fault ground motions and to the uncoupled torsional-to-translational fundamental frequency ratio (Omega) of the structure. Furthermore, the normalized accidental eccentricities due to simplified pulse-like and broadband ground motions in the near-fault region are computed and compared against each other. The results show that the normalized accidental eccentricity due to the broadband ground motion is well approximated by the simplified pulse for longer period buildings, while it is underestimated for shorter period buildings. For symmetric buildings with values of Omega commonly used in design practice, the normalized accidental eccentricity due to wave passage effects is less than the typical code-prescribed value of 5%, except for buildings with very large foundation radius. Copyright (C) 2017 John Wiley & Sons, Ltd.
机译：本文研究了对称建筑物中由于近断层区域中的波通过效应引起的扭转响应而引起的意外偏心率的特征。土壤-基础-结构系统被建模为对称圆柱体，该圆柱体放置在支撑在弹性半空间上的刚性圆形基础上，并受到倾斜入射平面SH波的作用，模拟近断层脉冲状地震动的作用。假设上层建筑在平移和摇摆基础激励的作用下表现为剪切梁，则计算平移响应，而扭转响应是使用先前研究中提出的数学公式计算的。分析中考虑了土壤基础结构系统的各种特性以及地震动输入，从而有助于对结构响应进行详细的参数研究。结果表明，归一化的偶然偏心距对近断层地震动的脉冲周期（T-P）和结构的非耦合扭转平移基频比（Omega）最为敏感。此外，计算并归因于故障附近区域中由于简化的脉冲状和宽带地面运动而导致的归一化偶然偏心率。结果表明，对于较长时期的建筑物，由宽带地面运动引起的归一化意外偏心率可以通过简化脉冲很好地近似，而对于较短时期的建筑物，则被低估了。对于设计实践中通常使用的Omega值的对称建筑物，除具有非常大的地基半径的建筑物外，归因于波通过效应的归一化偶然偏心率小于典范的典型规定值5％。版权所有（C）2017 John Wiley＆Sons，Ltd.

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