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首页> 外文期刊>Journal of Earthquake Engineering >Effect Of Flexibility Of Foundations On Its Seismic Stress Distribution
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Effect Of Flexibility Of Foundations On Its Seismic Stress Distribution

机译：地基柔性对其地震应力分布的影响

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摘要

To obtain the stress distribution within a shallow foundation, a distributed spring approach is proposed to represent soil behavior. Relevant analytical formulations for grid and raft foundations are derived on the basis of the lumped stiffness coefficients developed by Gazetas and recommended in modern codes such as FEMA 356 [2000]. The efficacy of the proposed formulations to represent the overall dynamic behavior and seismic response of the building frames with grid and raft foundations is checked against the established Gazetas scheme. A limited parametric study is also made to observe the effect of soil damping. This helps to arrive at a suitable damping ratio for combined structure-foundation-soil system. Subsequently, the variations in stress distributions incorporating the effect of soil-structure interaction at various locations of two types of foundations are also presented for some representative cases. Results show a substantial increase in the bending moment and shear force in the foundation itself due to such interaction effect. Such increase is observed to be strongly dependent on the framing action of the structure. This emphasises the necessity of considering this effect for safe seismic design. To this end, Distributed approach proposed in the present article may be conveniently employed with the help of any standard building analysis software besides using the outcomes of the parametric studies presented herein.
机译：为了获得浅层地基中的应力分布，提出了一种分布式弹簧方法来代表土的行为。网格和筏板基础的相关分析公式是根据Gazetas开发并在FEMA 356 [2000]等现代规范中推荐的集总刚度系数得出的。相对于已建立的Gazetas方案，检查了所提出的表示具有网格和筏板基础的建筑框架的整体动力特性和地震响应的有效性。还进行了有限的参数研究，以观察土壤阻尼的影响。这有助于为组合的基础-基础-土壤系统获得合适的阻尼比。随后，对于一些代表性案例，还提出了应力分布的变化，其中包括了两种类型地基的不同位置处的土-结构相互作用的影响。结果表明，由于这种相互作用的作用，基础本身的弯矩和剪切力大大增加。观察到这种增加在很大程度上取决于结构的框架作用。这强调了为安全的抗震设计考虑这种影响的必要性。为此，除使用本文介绍的参数研究结果外，可以在任何标准建筑分析软件的帮助下方便地采用本文中提出的分布式方法。

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