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.

这项研究的目的是通过实验和分析地研究通过静态和动态载荷测试在地面上钢筋混凝土桩的反应行为。假设将真正的RC桩固定在地基上，并且土壤盒充满了沙子，则将RC桩的模型标本固定在土壤盒的底部。将桩头承受逆转的循环横向负荷作为地震载荷。实验参数是桩头上的轴向力，包括由于基础的摇摆行为而引起的替代轴向力，以及桩头处的连通性条件。以下是从实验和分析得出的结论。1）随着桩头上轴向力的增加，在响应行为中观察到较大的磁滞回路，并且等效阻尼因子也变得很高。此外，在高轴向力的情况下观察到桩后的最大值恢复力的显着降低。2）2）最大损坏的长度独立于桩的轴向负载水平，仅取决于桩和周围土壤之间的相对刚度。用替代轴向负载的桩的响应行为取决于最大和最小恒定轴向载荷下的行为。因此，最重要的一点是评估地震激发下桩上可能的轴向负荷范围。3）为了评估包括桩基础在内的整个混凝土结构系统的地震行为，考虑到基于3级有限元分析，考虑了桩和土壤分离的响应分析方法。由开发方法给出的分析结果与实验结果有很好的一致性。