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Evaluating Shear Stiffness and Crack for Reinforced Concrete Columns under combined states of stress

评估组合应力状态下钢筋混凝土柱的剪切刚度和裂缝

基本信息

批准号：
15560487
负责人：
SHINOHARA Yasuji
金额：
$ 2.37万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560487/
关键词：
Concrete Crack Shear stiffness Shear crack Confining effect Crack control Lateral prestress 3-D Finite element analysis

项目摘要

The prestress in concrete structures is aimed generally at controlling the flexural cracks by the arrangement of tendons in an axial direction of the member. On the other hand, in order to delay initiating a shear crack and to reduce its width, experimental studies were conducted on the reinforced concrete(RC) columns laterally prestressed by the shear reinforcements. The test results have indicated that the performance in shear behaviors can be improved by the active confinement. The three dimensional finite element(FEM) analyses were also performed on RC columns to investigate the mechanics of the lateral confinement using the equivalent confining pressure and the degree of as a measure to evaluate active confinement and shear damage quantitatively. These studies have revealed that an increase in resistance against shear failure as well as shear cracking with increasing prestress in the shear reinforcements could be explained by the triaxial state of stress in the core concrete. The … More following study is to investigate how the lateral prestress in RC columns would affect the shear crack behaviors. The flexure-shear tests have been performed on two columns which are laterally prestressed(LPRC) and not prestressed(RC). Three strain gauges were glued on each of shear reinforcements and the widths of every shear crack over shear reinforcements were measured using two digital microscopes. The close relationship between the width of shear cracks and the distributed strain in reinforcements has been proven by evaluating the crack width from the gauges on reinforcements. With increasing lateral pressure, shear crack strength and ultimate shear strength have increased proportionally, shear crack patterns have changed appreciably, and the widths of cracks have decreased drastically. The FEM analyses can predict the difference between the shear strengths of RC columns and LPRC columns with a fair degree of precision. Furthermore, the FEM analyses using smeared crack model cannot evaluate a localized crack accurately but can provide valuable information about the total damage in the overall depth of a specimen. Less

混凝土结构中的预应力通常是通过在构件的轴向方向上布置预应力筋来控制弯曲裂缝。另一方面，为了延缓剪切裂缝的产生并减小其宽度，对受剪钢筋施加横向预应力的钢筋混凝土柱进行了试验研究。试验结果表明，主动约束能有效地改善混凝土的抗剪性能。本文还对钢筋混凝土柱进行了三维有限元分析，以等效围压和剪切破坏程度作为定量评价主动约束和剪切破坏的指标，研究了侧向约束的机理。这些研究表明，抗剪切破坏的阻力增加，以及剪切开裂与增加预应力的抗剪钢筋可以解释的三轴状态的应力在核心混凝土。的 ...更多信息本研究旨在探讨侧向预应力对混凝土柱剪力裂缝特性之影响。对两个水平预应力（LPRC）和非预应力（RC）柱进行了弯剪试验。在每根抗剪钢筋上粘贴三个应变片，用两个数字显微镜测量了每根抗剪钢筋上的剪切裂缝宽度。通过对钢筋应变片上裂缝宽度的估算，证明了钢筋中剪切裂缝宽度与分布应变之间的密切关系。随着侧压力的增加，剪切裂缝强度和极限剪切强度成比例地增加，剪切裂缝模式发生了明显的变化，裂缝宽度急剧减小。有限元分析可以预测钢筋混凝土柱和LPRC柱的抗剪强度之间的差异，具有相当的精度。此外，使用弥散裂纹模型的有限元分析无法准确评估局部裂纹，但可以提供有关样本整个深度的总损伤的有价值的信息。少

项目成果

期刊论文数量（29）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

渡部洋: "横方向プレストレスによる鉄筋コンクリート柱のせん断ひび割れ制御と終局耐力の評価"日本建築学会構造系論文集. 577. 109-116 (2004)

Hiroshi Watanabe：“使用横向预应力的钢筋混凝土柱的剪切裂缝控制和极限强度评估”，日本建筑学会结构工程学报 577. 109-116 (2004)。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

100N/mm^2を超える高強度コンクリートのひび割れ面におけるせん断挙動に関する研究

超过100N/mm^2高强混凝土裂纹表面剪切行为研究

DOI：
发表时间：
2004
期刊：
コンクリート工学年次論文集 26・2
影响因子：
0
作者：
Fu Rong Wu;Yoshihiro Masuda;Shigeharu Nakamura;長谷川了一
通讯作者：
長谷川了一

Influence of Lateral Prestress on Residual Shear Crack of Reinforced Concrete Column

横向预应力对钢筋混凝土柱残余剪切裂缝的影响

DOI：
发表时间：
2004
期刊：
13th World Conference on Earthquake Engineering (CD-ROM)
影响因子：
0
作者：
江波戸和正;森田耕次;照沼美穂;野本篤史;Hiroshi WATANABE
通讯作者：
Hiroshi WATANABE

Active Confining Effect and Failure Mechanism for RC Columns Prestressed Laterally

横向预应力钢筋混凝土柱的主动围限效应及破坏机制

DOI：
发表时间：
2004
期刊：
Journal of Structural and Construction Engineering(Transaction of AIJ) No.578
影响因子：
0
作者：
呉富栄;桝田佳寛;中村成春;新沼大史;Hiroshi WATANABE;Yasuji SHINOHARA
通讯作者：
Yasuji SHINOHARA

Damage Process Estimation of R/C Column using Shear Crack Behavior

利用剪切裂纹行为估计 R/C 柱的损伤过程