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Development of Earthquake Response Analysis for Whole Structural System Consisting of Ground, Piles and RC Structures

由地基、桩和钢筋混凝土结构组成的整个结构系统的地震响应分析的发展

基本信息

批准号：
12555124
负责人：
MUTSUYOSHI Hiroshi
金额：
$ 5.63万
依托单位：
SAITAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555124/
关键词：
RC PILES GROUND RESPONSE OF WHOLE STRUCTURE EARTHQUAKE RESPONSE ANALYSIS 地盤・杭相互作用耐震

项目摘要

The objective of this research is to investigate experimentally and analytically the response behavior of reinforced concrete piles under ground by the static and dynamic loading tests. The model specimens of RC piles were fixed to the bottom of the soil box assuming that a real RC pile is fixed at foundations, and the soil box was filled with sand. The pile head was subjected to reversed cyclic lateral loading as seismic load. The experimental parameters were the axial force on the pile head, including the alternative axial force due to rocking behavior of footing, and the connectivity condition at the pile head. The followings are derived conclusions from the experiment and analysis.1) With the increase of the axial force on the pile head, the larger hysteresis loops were observed in the response behavior, and the equivalent damping factor also became high. Additionally, a remarkable reduction of restoring force from its maximum value after yielding of the pile was observed in the case of high axial force.2) The maximum damaged length is independent on the axial load level of the pile and dependent only on the relative stiffness between pile and surrounding soil. The response behavior of the pile with the alternative axial load is determined by the behavior under the maximum and minimum constant axial load. Therefore, the most important point is to evaluate the possible range of axial load on the pile under seismic excitation.3) In order to evaluate the seismic behavior of the whole system of concrete structures including pile foundation, the response analysis method considering the separation of pile and soil was developed, based on 3-dimensional finite element analysis. Analytical results given by the developed method have good agreement with the experimental results.

本研究的目的是借由静载与动载试验，探讨地下钢筋混凝土桩的反应特性。将RC桩模型试件固定在土箱底部，假设一根真实的RC桩固定在基础上，土箱中填充砂。桩顶承受水平反复荷载作为地震荷载。试验参数为桩顶轴力，包括基础摇摆引起的交变轴力和桩顶连通条件。通过试验和分析，得出以下结论：1）随着桩顶轴力的增大，桩的滞回曲线变大，等效阻尼因子也增大。此外，在高轴力作用下，桩身屈服后的恢复力较其最大值有明显减小。2）最大破坏长度与桩身轴力水平无关，仅与桩身与周围土体的相对刚度有关。桩在交变轴力作用下的响应特性由桩在最大和最小恒定轴力作用下的响应特性决定。因此，最重要的是评估桩在地震作用下轴力的可能范围。3）为了评估包括桩基在内的整个混凝土结构体系的抗震性能，基于三维有限元分析，建立了考虑桩土分离的反应分析方法。所发展的方法给出的分析结果与实验结果吻合良好。