Study on the application of high strength concrete to RC and PC structures and its design method

高强混凝土在RC、PC结构中的应用及其设计方法研究

• 批准号: 09555139
• 负责人: KOBAYASHI Kazuo
• 金额: $ 6.27万
• 依托单位: Osaka Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555139/
• 关键词: high strength concrete; beam members; flexural behavior; shear behavior; fatigue property; deformation characteristics; long term deflection

In this study, fundamental behaviors of concrete members with high strength concrete are investigated in order to establish a rational design method for concrete members using high strength concrete. The main results obtained are as follows.1.By using high strength concrete with compressive strength of fc*80N/mm^2, the ultimate flexural capacity of prestressed concrete (PC) simple and continuous beams as well as the stress of prestressing steel at the ultimate state can be increased, especially in unbonded PC members. Even in the case of unbonded PC members with high strength concrete, flexural behaviors up to the ultimate state can be evaluated by ordinary flexural analysis using the deformation compatibility factor of beta=0.20-0.25.2.Shear cracking load increases with increasing the introduced prestressing stress and compressive strength of concrete scarcely affects its increasing ratio. Shear capacity is also increased with increasing the prestress. However, its increasing ratio in the PC beams with high strength concrete becomes smaller compared with that with normal strength concrete.3.As for the fatigue behaviors of reinforced concrete (RC) beams under water, shear force carried by concrete decreases with increasing the repeated cycles and its decreasing ratio becomes larger in case of the beams with high strength concrete. However, fatigue strength of RC beams is larger in the beams with high strength concrete than the beams with normal strength concrete.4.Long term deflection of prestressed reinforced concrete (PRC) beams with high strength concrete can be reasonably estimated by the method proposed by JSCE Standard Specification for Design and Construction of Concrete Structures.5.Compressive ductility of high strength concrete as well as flexural ductility of RC beams with high strength concrete can be effectively improved by lateral confinement using continuous fiber sheets.

本研究旨在探讨高强混凝土构件的基本性能，以建立高强混凝土构件的合理设计方法。主要研究结果如下：1.采用抗压强度为fc * 80N/mm^2的高强混凝土，可以提高预应力混凝土简支梁和连续梁的极限抗弯承载力，提高极限状态下预应力筋的应力，特别是无粘结预应力混凝土构件。即使在高强混凝土无粘结预应力混凝土构件的情况下，也可以采用变形协调系数β = 0.20~0.25的普通弯曲分析方法来评估其极限状态下的弯曲性能。2.剪切开裂荷载随预应力的增加而增加，混凝土的抗压强度对其增加率的影响不大。抗剪承载力也随着预应力的增加而增加。3.钢筋混凝土（RC）梁在水下的疲劳性能表明，混凝土所受剪力随循环次数的增加而减小，且高强混凝土梁的减小率较大。然而，在这方面，高强混凝土梁的疲劳强度比普通混凝土梁的疲劳强度大。4.预应力混凝土梁的长期挠度采用JSCE《混凝土结构设计与施工规范》提出的方法，可以合理地估算高强混凝土梁的延性采用连续纤维布侧向约束可以有效地改善高强混凝土的抗弯性能。

项目成果

示 敬三 ほか: "PRCはり部材のせん断耐荷挙動に及ぼすプレストレスの影響" コンクリート工学年次論文報告集. 20巻・3号. 313-318 (1998)

Keizo Shi 等人：“预应力对 PRC 梁构件剪切承载性能的影响”，混凝土工程年报，第 20 卷，第 3. 313-318 期（1998 年）。

井上 正一 ほか: "水中RCはりのせん断疲労挙動" コンクリート工学年次論文報告集. 20巻・3号. 289-294 (1998)

Shoichi Inoue 等人：“水下 RC 梁的剪切疲劳行为”《混凝土工程年度论文集》，第 20 卷，第 3. 289-294 期（1998 年）。

R.V.Shitindi ほか: "Stress-strain Behavior of Concrete Confined by FRP" Materials Science Research International. Vol.4 No.3. 163-170 (1998)

R.V. Shitindi 等人：“FRP 限制的混凝土的应力应变行为”，《材料科学研究国际》第 4 卷第 3 期（1998 年）。

Yasuhiro Mikata et al.: "Effects of Prestressing Force on Shear Capacity of Prestressed Concrete Beams without Shear Reinforcement" Proc.Of the JCI. Vol.20, No.3. 319-324 (1998)

Yasuhiro Mikata 等人：“预应力对无抗剪钢筋的预应力混凝土梁抗剪能力的影响”Proc.Of the JCI。

井上正一 ほか: "水中RCはりのせん断疲労挙動" コンクリート工学年次論文報告集. 20巻/3号. 289-294 (1998)

Shoichi Inoue 等人：“水下 RC 梁的剪切疲劳行为”《混凝土工程年度论文集》第 20 卷/第 3. 289-294 期（1998 年）。