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Seismic Behavior of RC Structures considering the Interaction between Soil and Foundation

考虑土与地基相互作用的RC结构抗震性能

基本信息

批准号：
10650447
负责人：
MUTSUYOSHI Hiroshi
金额：
$ 2.56万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650447/
关键词：
seismic behavior ground foundation pile 基礎-地盤-杭相互作用地震応答

项目摘要

The objective of this research are, 1) to develop the response analysis method of the RC structural system considering the interaction between the foundation and the surrounding ground, 2) to verify the method by the result of the model loading test of RC pile in soil, and 3) to consider the seismic behavior of RC structure affected by the response of the piles and soil. Finally, the fruits from these considerations will be made good use for improving the seismic design method of RC structures.In this year, the static and dynamic loading tests of RC model piles in soil are performed. The specimens are fixed on the bottom of the steel soil box, to model the condition at the base in real case. The soil box with pile specimen is filled by the dry sand of which the material properties are clear. The reversed cyclic load or the dynamic sine wave load is acted at the pile top, modeling the seismic load transmitted from footing to pile. In addition, the response analyses of RC structural system, consists of surrounding ground, piles, footing, pier and superstructure, are performed using 3-dimensional elasto-plastic finite element method. From these results, the following points are clarified ; (1) The plastic area of RC pile, i.e. plastic hinge, spreads to lower due to reversed cyclic loading. Additionally, the behavior of the pile is affected by the stiffness of surrounding ground, but not by the shape of the cross section of the pile. (2) The settlement of the ground is observed at the surface around the pile top due to the reversed cyclic loading. This phenomenon causes the compaction of the ground around the pile and the damage of the pile proceeds with the increment of stiffness of surrounding ground. (3) The analytical method used in this research can evaluate the behavior of RC pile in ground to some extent.

本研究的目的是：1)建立考虑地基与周围地基相互作用的钢筋混凝土结构体系的反应分析方法；2)通过钢筋混凝土桩在地基中的模型加载试验结果对该方法进行验证；3)考虑桩土反应对钢筋混凝土结构抗震性能的影响。最后，这些考虑的成果将很好地用于改进钢筋混凝土结构的抗震设计方法。今年，进行了土中钢筋混凝土模型桩的静力和动力荷载试验。将试件固定在钢土箱的底部，模拟实际情况下的地基条件。装有桩样的土箱是用材料性质清晰的干砂填充的。在桩顶施加反向循环荷载或正弦波动力荷载，模拟地震荷载从桩基传递到桩的过程。此外，还利用三维弹塑性有限元方法对钢筋混凝土结构体系进行了反应分析，该体系包括周围地基、桩、基础、桥墩和上部结构。结果表明：(1)在反复荷载作用下，钢筋混凝土桩的塑性区域，即塑性铰向下扩展。此外，桩的性状受周围地基的刚度影响，而不受桩的横截面形状的影响。(2)在反复荷载作用下，桩顶周围地表出现地面沉降现象。这一现象导致桩周土体发生挤密，桩周土体的损伤随着周围土体刚度的增大而增大。(3)本文采用的分析方法可以在一定程度上评价钢筋混凝土桩在地基中的工作性状。