Experimental Studies on the Design Method to Prevent the Shear Failure of Reinforced Concrete Short Columns by Using Steel Tube

钢管预防钢筋混凝土短柱剪切破坏设计方法试验研究

• 批准号: 60302071
• 负责人: TOMII Masahide
• 金额: $ 5.57万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60302071/
• 关键词: steel tube; transverse reinforcement; shear failure; bond splitting failure; buckling of longitudinal bar; wall girder; short column; 耐震壁; 鋼管補強; 靭性; エネルギー吸収性能; 付着強度; 側柱

The objective of this research project is to develop a transversely-super-reinforcing (T.S.R.) method in which steel tubes are partly used as transverse reinforcement to prevent a brittle failure of weak parts such as short columns in reinforced concrete structures. The following conclusions are reached on bases of the study on the behavior of short columns and on the bond behavior between deformed bars and concrete confined in square steel tube. 1. Shear failure and buckling of longitudinal bars which bring brittle nature into reinforced concrete columns can be completely prevented by the T.S.R. method. The confinement of the concrete in the steel tube increases the compressive strength and deformation capacity of the infilled concrete, which results the augumentation of ultimate moment of columns. 2. The occurrence of bond splitting cracks cannot be prevented even by the T.S.R. method. By the T.S.R. method the bond strength between logitudinal bars and concrete, however, can be incre … More ased especially ofr the bars placed in corners. Moreover deterioration fo bond behavior observed in hooped columns can greately be improved by the T.S.R. method.In order to examine the validity of the T.S.R. method used in structures, tests on subassemblages composed of wall girders and short columns reinforced by the T.S.R. method and on framed shear walls with edge columns partly reinforced by the T.S.R. method were conducted. The following conclusions are reached on bases of those tests. 1. The collapse mechanism of the frame with wall girders can be changed from column mechanism which is a partial collapse mechanism into beam mechanism by strengthning the short column with heavy longitudinal bars and steel tube. Even if the plastic hinges are formed in top and bottom of the short column due to the existence of very strong wall girders, the frame is able to have large lateral load carrying capacity and behaves in very ductile manner. 2. The T.S.R. method can prevent edge columns of shear wall from shear failure which is most undesirable collapse mechanism and cannot be prevented by hoop reinforcement, even if the shear wall is designed to have thicker wall panel and smaller amount of longitudinal bars in edge columns. Therefore, the deformation capacity of shear walls can greately be improved by the T.S.R. method on condition that thickness of wall panel and amount of longitudinal bars in edge columns are appropriately determined. Less

本研究的目的是开发一种横向超增强（T.S.R.）用钢管部分作为横向钢筋以防止钢筋混凝土结构中短柱等薄弱部位的脆性破坏的方法。本文通过对短柱受力性能和方钢管混凝土与变形钢筋粘结性能的研究，得出以下结论。1.钢筋混凝土柱中纵筋的剪切破坏和屈曲是脆性的主要来源，而预应力钢筋混凝土柱中纵筋的剪切破坏和屈曲是由预应力钢筋混凝土柱中纵筋的剪切破坏和屈曲引起的。法钢管混凝土的约束作用提高了钢管混凝土的抗压强度和变形能力，从而增大了柱的极限弯矩。2.即使采用T.S.R.也不能防止粘结开裂的发生。法由运输安全局但用此法可提高钢筋与混凝土的粘结强度 ...更多信息 特别是指放在角落里的铁条。此外，箍柱中观察到的粘结性能的恶化可以大大改善由T.S.R.为了检验T.S.R.方法用于结构，测试组成的墙梁和短柱加固的T.S.R.方法和框架剪力墙与边缘柱部分加强T.S.R.方法进行。在这些试验的基础上得出以下结论。1.通过在短柱上设置重型纵筋和钢管，使带墙梁框架的倒塌机制由柱的部分倒塌机制转变为梁的倒塌机制。即使由于存在非常坚固的墙梁而在短柱的顶部和底部形成塑性铰，框架也能够具有大的侧向承载能力并且以非常延性的方式表现。2. T.S.R.该方法可以防止剪力墙边柱的剪切破坏，这是最不希望的倒塌机制，不能防止箍钢筋，即使剪力墙设计为具有较厚的墙板和边柱中的纵向钢筋的数量较少。因此，剪力墙的抗剪承载力可以通过T.方法是在适当确定墙板厚度和边柱纵筋数量的条件下，少

项目成果

富井政英,崎野健治,肖岩: Proceedings of Pacific Conference of Earthquaki Engineering. 2. 11-22 (1987)

Masahide Tomii，Kenji Sakino，Shoiwa：太平洋地震工程会议记录，2. 11-22 (1987)。

森下陽一,富井政英,崎野健治: Transactions of the Japan Concrete Institute. 9. 335-342 (1987)

Yoichi Morishita、Masahide Tomii、Kenji Sakino：日本混凝土协会汇刊 9. 335-342 (1987)。

森下陽一,須藤栄治,富井政英,崎野健治: 日本建築学会大会学術講演梗概集. 529-530 (1986)

Yoichi Morishita、Eiji Sudo、Masahide Tomii、Kenji Sakino：日本建筑学会会议学术讲座摘要 529-530 (1986)。

森下陽一,須藤栄治,富井政英,崎野健治: 日本建築学会大会学術講演梗概集. 531-532 (1986)

Yoichi Morishita、Eiji Sudo、Masahide Tomii、Kenji Sakino：日本建筑学会会议学术讲座摘要 531-532 (1986)。

富井政英,崎野健治,肖岩,渡辺宏一: Proceeding of the International Speciality Conference on Concrete Filled Steel Tubular Structures, Harbin, China. 119-125 (1985)

Masahide Tomii、Kenji Sakino、Xiao Yan、Koichi Watanabe：国际钢管混凝土专业会议论文集，中国哈尔滨 119-125（1985）。