Incipient Damage When Bending Stirrup and Its Influence on Mechanical Properties
ZHENG Yulong1, LIU Xiang1, LU Chunhua1,*, BU Senzhuang1, KOSA Kenji2
1 Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, Jiangsu, China 2 Department of Civil and Architectural Engineering, Kyushu Institute of Technology, Kitakyushu 8038501, Japan
Abstract: The brittle fracture of stirrup inside the structural member under the action of concrete disease expansion is considered to be related to the incipient damage formed during the bending process of the reinforcing bars, and it is worthy of in-depth study. Commonly used ribbed bars are utilized to carry out 90° bending tests under various processing parameters. It was found that the incipient cracks occurred with the maximum length accounting for 2.52% of the reinforcing bar diameter. Through the tensile test of the bent reinforcing bar, it can be learned that all specimens experienced an early fracture due to the progress of the incipient crack, with the minimum fracture strength as only 60% of the ultimate tensile strength. According to the analysis of the fracture surface, the minimum section shrinkage rate of the bent reinforcing bar was only 34% of the normal straight reinforcing bar, and the fracture surface showed a typical brittle characteristic. The long-term service can further aggravate the deteriorations of strength and plastic deformation property in the corner stirrup. This research will provide a reference for further optimizing the engineering application and mechanical properties design of bent steel bars.
作者简介: 郑玉龙,教授,硕士研究生导师,于2013年及2016年分别获得九州工业大学的硕士和博士学位,现任职于江苏大学土木工程与力学学院,主要研究方向为混凝土结构基本性能及耐久性、工业废弃物再利用等。近年来,主持并参与近10项国家自然科学基金等国内外科研项目,在Construction and Building Materials、Structures、日本土木学会论文集及构造工学论文集等国内外知名期刊上发表SCI收录等论文40余篇,受理授权国内外发明专利5项。 陆春华,教授,博士研究生导师,于2006年及2011年分别获得江苏大学的硕士和浙江大学的博士学位,现为江苏大学土木工程学科带头人,主要研究方向是混凝土结构基本性能及耐久性、FRP筋在混凝土结构中的应用。近年来,主持国家自然科学基金项目3项,在Composite Structures,Journal of Materials in Civil Engineering, Construction and Buil-ding Materials, Magazine of Concrete Research, 《土木工程学报》《建筑结构学报》以及《中国公路学报》等国内外知名期刊上发表SCI、EI收录论文30余篇,出版学术专著2部,授权中国专利5项。
引用本文:
郑玉龙, 刘翔, 陆春华, 步森壮, 幸左贤二. 箍筋弯折时的初期损伤及其对力学性能的影响[J]. 材料导报, 2022, 36(23): 21110130-6.
ZHENG Yulong, LIU Xiang, LU Chunhua, BU Senzhuang, KOSA Kenji. Incipient Damage When Bending Stirrup and Its Influence on Mechanical Properties. Materials Reports, 2022, 36(23): 21110130-6.
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2022, Vol. 36 
