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STUDY ON THE METHOD OF EVALUATING CONFINEMENT EFFECTS IN CONCRETE FILLED CIRCULAR STEEL TUBULAR COLUMNS

圆钢管混凝土柱约束效应评价方法研究

基本信息

批准号：
07650664
负责人：
SAKINO Kenji
金额：
$ 1.66万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650664/
关键词：
concentric axial compression confinement effect constitutive law non associated flow rule confined concrete biaxial stress state moment curvature relationship ultimate moment コンクリート充填鋼管径厚比超高強度コンクリート高軸力靭性許容応力度設計法降伏比高張力鋼

项目摘要

The following conclusions are reached on bases of the research which was supported by this Grant.1.Analytical method considering a confinement effect for concrete filled circular steel tubular columns (referred to as CFT columns) subjected to concentric axial compression(1) The elastic-plastic behavior of CFT columns can be predicted by the proposed plastic theory in which yield criterion proposed by Richart and constitutive law and non associated plastic flow rule proposed by Xiao for concrete are assumed.(2) The stress strain relationship for confined concrete proposed by Sakino and Sun can be used for more simple analytical method which is developed for practical use. In this practical method, the biaxial stress state of steel tube must be estimated by the proposed plastic theory described above.2.Analytical method considering the confinement effect for CFT columns subjected to combined stresses of axial load and bending moment(1) The stress strain relationship for confined concrete propose by Sakino and Sun, which have been verified to be applicable to analysis of CFT columns under concentric axial compression as described above, can also be used for moment curvature relationship analysis. This is verified by the comparisons between analytical results and experimental results of specimens tested in experimental phase of this research program.(2) A practical design formula for ultimata moment of CFT columns can be proposed based on the moment curvature relationship analysis described above.

本文在本项目研究的基础上，取得了以下主要成果：1.考虑约束效应的圆钢管混凝土柱的分析方法（称为CFT柱）承受同心轴向压缩（1）弹性-采用Richart屈服准则和本构关系，混凝土的塑性流动法则。(2)Sakino和Sun提出的约束混凝土的应力-应变关系可以作为一种更为简单的分析方法，是为实用而发展起来的。2.考虑约束效应的钢管混凝土柱在轴压和弯矩共同作用下的分析方法（1）采用Sakino和Sun提出的约束混凝土的应力-应变关系，已被证实适用于分析CFT柱在同心轴压下，如上所述，也可以用于弯矩曲率关系分析。这是验证了分析结果和实验结果之间的比较，在本研究计划的实验阶段测试的标本。(2)基于上述弯矩曲率关系分析，可提出钢管混凝土柱极限弯矩的实用设计公式。