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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.

本研究的目的是通过静态和动态加载试验来研究和分析地下钢筋混凝土桩的响应行为。假设真实的钢筋混凝土桩固定在地基上，将钢筋混凝土桩模型试件固定在土箱底部，土箱内填满沙子。桩头承受反向循环侧向荷载作为地震荷载。实验参数为桩头上的轴力，包括基础摇摆行为引起的交替轴力，以及桩头的连接状况。通过实验和分析得出以下结论：1)随着桩头轴向力的增加，响应行为出现较大的滞后回线，等效阻尼系数也变高。此外，在高轴向力的情况下，观察到桩屈服后恢复力从其最大值显着减小。2）最大受损长度与桩的轴向载荷水平无关，仅取决于桩与周围土体之间的相对刚度。交替轴向载荷下桩的响应行为由最大和最小恒定轴向载荷下的行为决定。因此，最重要的一点是评估地震激励下桩上可能承受的轴向荷载范围。3）为了评估包括桩基础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，提出了考虑桩土分离的响应分析方法。所开发的方法给出的分析结果与实验结果具有很好的一致性。