Effects of inertial and kinematic interaction on seismic behavior of pile with embedded foundation
Effects of inertial and kinematic interaction on seismic behavior of pile with embedded foundation
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DOI：
10.1016/j.soildyn.2004.11.018
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发表时间：
2005-08
影响因子：
4
通讯作者：
K. Tokimatsu;H. Suzuki;Masayoshi Sato
中科院分区：
文献类型：
--
作者：
K. Tokimatsu;H. Suzuki;Masayoshi Sato
通过干砂土地基中桩-结构模型的大型振动台试验，研究了惯性力和运动力对桩身应力的影响。试验结果表明，当上部结构的自振周期Tb小于地基的自振周期Tg时，地基位移趋于与上部结构的惯性力同相，增大了传递到桩上的剪力。相反，当Tbis大于Tg时，地面位移趋于与惯性力异相，从而抑制桩身应力的增加。考虑土压力对埋置基础和桩的影响，采用拟静力分析方法计算桩身最大弯矩分布。假设最大力矩等于由惯性和运动效应引起的两个应力之和，如果Tb <Tgor the square root of the sum of the squares of the two if Tb>Tg。无论是否发生液化，估算的桩身应力值与实测值吻合较好。
Effects of inertial and kinematic forces on pile stresses are studied based on large shaking table tests on pile-structure models with a foundation embedded in dry and liquefiable sand deposits. The test results show that, if the natural period of the superstructure, Tb, is less than that of the ground, Tg, the ground displacement tends to be in phase with the inertial force from the superstructure, increasing the shear force transmitted to the pile. In contrast, if Tbis greater than Tg, the ground displacement tends to be out of phase with the inertial force, restraining the pile stress from increasing. With the effects of earth pressures on the embedded foundation and pile incorporated in, pseudo-static analysis is conducted to estimate maximum moment distribution in pile. It is assumed that the maximum moment is equal to the sum of the two stresses caused by the inertial and kinematic effects if Tb<Tgor the square root of the sum of the squares of the two if Tb>Tg. The estimated pile stresses are in good agreement with the observed ones regardless of the occurrence of soil liquefaction.