The Scale Effects on the Stress-Strain Relationships of Concrete Confined by High Strength Lateral Reinforcement

高强侧向钢筋约束混凝土应力应变关系的尺度效应

• 批准号: 13650626
• 负责人: TANAKA Hitoshi
• 金额: $ 2.37万
• 依托单位: KYOTO 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-13650626/
• 关键词: scale effects; reinforced concrete column; confined concrete; concentric loading test; stress-strain model; hoop reinforcement; seismic design; limit state design; コンクリート圧縮強度; コンクリート応力-歪関係; 横拘束筋; 鉄筋コンクリート柱; 高層住宅

In this study, focusing on the scale effects, some concentric compression loading tests were conducted using square columns to obtain the compressive stress-strain relationships of confined and unconfined concrete. As the main experimental variable, the sectional width of the tested square columns was varied from 194mm to 600mm. It was found that, due to the significant scale effect, the strength of columns was reduced more than predicted by any of the previously proposed models. Based on these experimental results, modification of a previous stress-strain model for confined and unconfined concrete was proposed so as to be able to take the sectional dimensions of column into account. The adequacy of the modified model was examined by comparing with the experimental results from this study and also from other sources.It is noted that, when only the safety limit state is considered in the column design, the strength reduction due to the scale effect might not be so significant especially for the case of concrete columns confined by closely spaced lateral reinforcement. This is because the ultimate limit state of such coned concrete columns is dominated by the details of lateral confining reinforcement rather than the characteristics of plain concrete. However, the strength reduction of concrete due to the scale effect could become crucial if the serviceability limit state and the damage control limit state are considered in the design. This is because the column damage level under such limit states is predominantly determined by the characteristics of unconfined cover concrete and core concrete with little confining stress.

本研究着眼于尺度效应，利用方柱进行同心压缩加载试验，以获得约束和无约束混凝土的压缩应力-应变关系。作为主要实验变量，测试方柱的截面宽度在 194mm 至 600mm 之间变化。结果发现，由于显着的尺度效应，柱的强度降低程度超过了之前提出的任何模型的预测。基于这些实验结果，提出了对先前的约束和无约束混凝土应力-应变模型的修改，以便能够考虑柱的截面尺寸。通过与本研究和其他来源的实验结果进行比较，检验了修改模型的充分性。值得注意的是，当柱设计中仅考虑安全极限状态时，由于尺度效应而导致的强度降低可能不会那么显着，特别是对于受到紧密间隔的侧向钢筋限制的混凝土柱的情况。这是因为此类锥形混凝土柱的极限状态是由侧向约束钢筋的细节决定的，而不是素混凝土的特性。然而，如果在设计中考虑使用极限状态和损伤控制极限状态，由于尺度效应而导致的混凝土强度降低可能变得至关重要。这是因为这种极限状态下的柱损伤水平主要由无侧限覆盖层混凝土和围压较小的核心混凝土的特性决定。

项目成果

Experimental study concerning the scale effects on the stress-strain models of confined concrete Part 1 Outline of tests and results (in Japanese)

关于约束混凝土应力-应变模型的尺度效应的实验研究第1部分试验和结果概要（日语）

• 发表时间: 2001
• 期刊: Proceedings of the AIJ (Architectural Institute of Japan) annual meeting (Kantoh) C・2
• 作者: NAKAJI Hiroyuki;TANAKA Hitoshi;HIKIDA
• 通讯作者: HIKIDA

THE SCALE EFFECTS ON THE REINFORCED CONCRETE COLUMNS WITH HIGH AXIAL LOAD

高轴载钢筋混凝土柱的尺度效应

• 发表时间: 2001
• 期刊: Proceedings of The 3^<rd> Japan-Korea-Taiwan Joint Seminar on Earthquake Engineering for Building Structures
• 作者: Hitoshi TANAKA;Tsuguo HIKIDA;Hiroyuki NAKAJI
• 通讯作者: Hiroyuki NAKAJI

Experimental study concerning the scale effects on the stress-strain models of confind concrete Part2 Proposal of stress-strain model of confined concrete focusing on the scale effects (in Japanese)

约束混凝土应力应变模型尺度效应的实验研究第2部分关注尺度效应的约束混凝土应力应变模型的建议（日文）

• 发表时间: 2001
• 期刊: Proceedings of the AIJ (Architectural Institute of Japan) annual meeting (Kantoh) C・2
• 作者: HIKIDA Tsuguo;TANAKA Hitoshi;NAKAJI Hiroyuki
• 通讯作者: NAKAJI Hiroyuki

The Scale Effects on the Stress-Strain Relationships of Concrete under Concentric Axial Compression Loading (in Japanese)

同心轴压荷载下混凝土应力应变关系的尺度效应（日文）

• 发表时间: 2002
• 期刊: Proceedings of the Japan Concrete Institute Vol.24, No.2
• 作者: HIKIDA Tsuguo;KURAMOTO Hiroshi;TANAKA Hitoshi;NAKAJI Hiroyuki
• 通讯作者: NAKAJI Hiroyuki

疋田次峰, 倉本 洋, 田中仁史, 中治弘行: "コンクリート-軸圧縮応力-ひずみ関係に及ぼす寸法効果の影響"コンクリート工学年次論文集. 第24巻・第2号. 193-198 (2002)

Tsumine Hikita、Hiroshi Kuramoto、Hitoshi Tanaka、Hiroyuki Nakaji：“尺寸效应对混凝土轴压应力-应变关系的影响”，混凝土工程年刊，第 24 卷，第 2 期，193-198 (2002)。