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Reduction factors to evaluate acceleration demand of soil-foundation-structure systems

机译：降低因素评价土基地基结构系统的加速需求

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摘要

The seismic acceleration loading of structures founded on compliant soil is investigated through numerical elastic time history analyses of coupled soil-foundation-structure (SFS) systems and appropriate reduction factors of acceleration demand for free-field to evaluate acceleration demand for the SFS systems are proposed. The proposed reduction factors are the division of the acceleration demand for the coupled SFS system over the acceleration demand for the free-field, and propose an alternative method to calculate the actual acceleration loading considering interaction effects. The advantages of the proposed methodology are i) its accuracy, as the reduction factors result from coupled SFS numerical finite element analyses and consider both inertial and kinematic interaction effects and ii) its practicality, as it can be applied by the user performing no finite element numerical analysis. Additionally, the presented methodology can be applied to systems with important mass (e.g. bridge structures). The proposed acceleration reduction factors are presented in terms of dimensionless engineering parameters such as soil to structure stiffness ratio and the structure's aspect ratio. The accuracy, efficiency, and practicality of the proposed methodology are highlighted through an application to a typical bridge structure. Because structures with surface foundations are examined, inertial interaction mainly affects the acceleration demand. Therefore, the proposed reduction factors clearly demonstrate and quantify the beneficial effect of damping on buildings and bridges, as the maximum average acceleration at the top of the actual SFS system can reduce to about 55-85% of the acceleration demand for the free-field motion.
机译：通过耦合土基 - 基础结构（SFS）系统的数值弹性时间历史分析，研究了兼容土壤上创立的结构的地震加速加载，提出了适当降低自由场的加速需求因素，以评估SFS系统的加速需求。 。所提出的降低因素是对自由场加速需求耦合的SFS系统的加速需求的划分，并提出了一种替代方法来计算考虑互动效应的实际加速负荷。所提出的方法的优点是i）其准确性，因为耦合SFS数值有限元分析并考虑惯性和运动相互作用效应和II）其实用性，因为它可以由用户执行没有有限元的实用性。数值分析。另外，所提出的方法可以应用于具有重要质量（例如桥梁结构）的系统。所提出的加速度减少因子以无量纲工程参数（如土壤为结构刚度比和结构的纵横比）提出。通过应用于典型的桥结构，突出了所提出的方法的准确性，效率和实用性。由于检查了表面基础的结构，因此惯性相互作用主要影响加速需求。因此，所提出的降低因素清楚地证明并量化了阻尼在建筑物和桥梁上的有益效果，因为实际SFS系统顶部的最高平均加速度可以减少到自由场的加速需求的约55-85％运动。

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