Effects of Flexibility on Rocking Impedance of Deeply Embedded Foundation
Effects of Flexibility on Rocking Impedance of Deeply Embedded Foundation
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DOI：
10.1061/(asce)1090-0241(2004)130:4(438
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发表时间：
2004-03
影响因子：
3.9
通讯作者：
M. Saitoh;Hiroyuki Watanabe
中科院分区：
文献类型：
--
作者：
M. Saitoh;Hiroyuki Watanabe
本文详细研究了预埋基础中柔性侧壁对振动阻抗的影响。研究的重点是垂直和圆柱形基础嵌入均匀弹性地层。为了预测柔韧性的影响，基于三维波传播理论和单一模型上的摇摆和弯曲运动的叠加，假设土与基础之间的完全粘接条件，推导了振动阻抗的封闭公式。从封闭形式的公式中，根据基础的高度与半径之比和地基与基础的刚度之比，确定了一个表示柔性影响的函数。柔性侧壁的振动阻抗与刚性侧壁下的振动阻抗不同。评估了刚性侧壁假设下的振动阻抗评估的适用范围，并给出了有助于估计深埋基础动力响应的轮廓线。
This paper presents a detailed investigation of the influence on the rocking impedance of flexible sidewalls in embedded foundations. The study focuses on vertical and cylindrical foundations embedded in a homogeneous elastic stratum. In order to anticipate the effects of the flexibility, closed-form formulae for rocking impedance are derived based on three-dimensional wave propagation theory and superposition of both the rocking and flexural movements on a single model by assuming complete bonding conditions between the soil and foundations. A function representing the effect of the flexibility is identified from the closed-form formulae, in terms of the height to radius ratio of the foundations and the ratio of the stiffnesses of the ground and foundations. The rocking impedance for a flexible sidewall differs from those evaluated under the assumption of a rigid sidewall. The applicable range of rocking impedance evaluated under the assumption of a rigid sidewall is assessed, and contours to assist in the estimation of the dynamic response of deeply embedded foundations are presented.