| 约束混凝土的有效约束半径 |
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| 引用本文： | 聂建国,柏宇,李盛勇,XIAO Yan. 约束混凝土的有效约束半径[J]. 清华大学学报(自然科学版), 2005, 45(3): 289-292 |
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| 作者姓名： | 聂建国 柏宇 李盛勇 XIAO Yan |
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| 作者单位： | 清华大学,土木工程系,北京,100084;广东省,建筑设计院,广州,520000;Department of Civil Engineering, University of Southern California, Los Angeles,CA 90089,USA |
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| 基金项目： | 国家杰出青年基金海外青年学者合作基金资助项目(50128807) |
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| 摘 要： | 约束混凝土处于三向受压应力状态,提高了混凝土的强度和变形能力。由于周边约束提供的径向约束应力沿径向的不均匀分布,对核心混凝土的约束作用存在着一个有效的范围,在此范围之外的周边混凝土基本不再发挥约束作用。该文引入合理的简化计算模型,通过弹性力学解析解和有限元分析,得到径向约束应力沿径向的衰减分布形式,提出了对核心混凝土起约束作用的有效半径范围,即外内径比不超过3的区域。此范围与混凝土局部承压试验结果吻合良好,并能推广应用于其他形式的约束混凝土。
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| 关 键 词： | 约束混凝土 有效约束半径 径向应力 环向应力 |
| 文章编号： | 1000-0054(2005)03-0289-04 |
| 修稿时间： | 2003-10-24 |
Effective restrained radius of confined concrete |
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| NIE Jianguo,BAI Yu,LI Shengyoung,XIAO Yan. Effective restrained radius of confined concrete[J]. Journal of Tsinghua University(Science and Technology), 2005, 45(3): 289-292 |
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| Authors: | NIE Jianguo BAI Yu LI Shengyoung XIAO Yan |
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| Affiliation: | NIE Jianguo~1,BAI Yu~1,LI Shengyoung~2,XIAO Yan~3 |
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| Abstract: | Three-axis compression increases the ductility and strength of confined concrete structrues. The radial confined stress is distributed non-uniformly along the radial direction in a limited region, so the area outside this region does not need to be considered. A theoretical model and finite element analyses were used to calculate the effective restrained radius of a confined area, in which the ratio of outside and inside diameters is less than 3. The area is in good agreement with experimental results of local compression test in concrete structures. The method can also be applied to other kinds of confined concrete structures. |
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| Keywords: | confined concrete effective restrained radius radial stress tangential stress |
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