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Influence of Height and Section Shape of Rectangular Confined Concrete on its Stress-Strain Relationship

矩形约束混凝土高度和截面形状对其应力应变关系的影响

基本信息

批准号：
13650629
负责人：
NAKATSUKA Tadashi
金额：
$ 2.37万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650629/
关键词：
confined concrete rectangular stress-strain relation ratio of height to short side length ratio to long side length to short one performance design shear force resisting mechanism 圧縮強度時ひずみ角型

项目摘要

For the latest performance design of concrete structures , information on load-deformation characteristics and damage assessment of structural members are required essentially. This situation leads to necessity of more researches, on stress-strain relations of concrete, especially confined concrete which relates closely structural performance of the members.Investigations on strength and deformation properties of the concrete with rectangular sections under uni-axial compression load, and subjected to shear force and axial load were carried out. Following main conclusions are obtained.1) In the case of plain concrete under uni-axial compression, though the side length ratio of rectangular section has little influence on the stress-strain relationship, the ratio of height to the short side length of the section has a pronounced effect on the characteristics, that is, compression strength and strain at the strength increase, and gradients of falling branch of stress-strain relations beco … More me more gently with decrease in the ratio. In contrast, in the case of confined concrete, similar remarkable effects of the ratio of height to the short side length are observed. The side length ratio influences strength and deformation properties due to decrement of confining stress of lateral reinforcement relative to long side length of the rectangular section.2) Equations to estimate stress-strain relations of concrete with different ratios of long side length, to short one, and ratios of height to short side length of rectangular sections are derived. Moreover, it is shown that the equations predict strength and deformation characteristics with practical accuracy.3) Uni-axial stress-strain characteristics of confined concrete subjected to constant shear force and axial load show smaller tangent modulus, smaller compressive. strength and smaller strain at the strength, in the case of higher shear force level. Equations to estimate strength and strain at the strength are introduced using test data. Less

混凝土结构的最新性能设计需要结构构件的荷载-变形特性和损伤评估信息。本文对矩形截面混凝土在单轴受压、受剪和轴压作用下的强度和变形特性进行了研究，并对矩形截面混凝土在单轴受压、受剪和轴压作用下的强度和变形特性进行了分析。得出以下主要结论：1）在单轴受压情况下，矩形截面边长比对应力-应变关系影响不大，但截面高短比对应力-应变关系有显著影响，即抗压强度和强度点应变均增大，应力-应变关系下降分支的梯度 ...更多信息随着比例的降低，我的动作会更轻柔。与此相反，在约束混凝土的情况下，观察到类似的显着影响的比例的高度短边长度。矩形截面边长比对混凝土的强度和变形性能有影响，其原因是侧筋的侧围应力相对于矩形截面长边长比减小。2）推导了不同矩形截面长短边长比、高短边长比时混凝土的应力-应变关系计算公式。3）约束混凝土在轴向荷载和常剪荷载作用下的单轴应力-应变特性表现为切线模量较小，压缩模量较小。在较高的剪切力水平下，利用试验数据，介绍了估算强度和强度处应变的公式。少