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Lateral Bearing Capacity of Embedded Pile Foundation under Sinusoidal Excitation

正弦激励下埋入式桩基的横向承载力

基本信息

批准号：
02650395
负责人：
TAGA Naotsune
金额：
$ 1.41万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650395/
关键词：
Pile foundation Embedment effect dynamic earth pressure Model test Finite element method Lateral force distribution ratio Lateral face friction on the side walls 地下埋設部地震時土圧

项目摘要

There are Three factors that affect resistance of the underground structure of building against seismic force, that is, (a) front and back earth pressure, (b) lateral face friction on the side walls and (c) resilient rigidity of piles. This study aims at clarifying the lateral bearing capacity of embedded foundation, and analyzing the characteristics of earth pressure in earthquake. To study, sinusoidal excitation tests were made under the restricted conditions using an oscillating soil bin, followed by the finite element analysis simulated with pseudo-three-dimensional models. The study of parameters was also made in analytical method under different conditions.From these tests and parameter analysis, it was found that the lateral bearing capacity of embedded foundation could be easily explained through the behavior of both foudation and soil. When the amplification magnitude of the structure was larger than that of the ground, the lateral force distribution ratio of the earth pressure exceeded 50% and that of the piles decreased to about 25%. Lateral face friction ratio is about 10-30% and does not significantly depend on the superstructure.

影响建筑物地下结构抗震性能的因素有三个：（a）前后土压力，（B）侧墙的侧摩阻力，（c）桩的回弹刚度。本文旨在明确埋置基础的水平承载力，分析地震作用下土压力的变化规律。为了研究，正弦激励试验的限制条件下，使用振荡土槽，然后用伪三维模型模拟的有限元分析。通过试验和参数分析，发现埋置基础的水平承载力可以很好地从基础和土体的共同作用来解释。当结构的放大幅度大于地面的放大幅度时，土压力的侧向力分配比超过50%，桩的侧向力分配比降低到25%左右。侧面摩擦比约为10-30%，与上部结构的关系不大。