箍筋弯折时的初期损伤及其对力学性能的影响

doi:10.11896/cldb.21110130

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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.

Key words： concrete durability brittle fracture of stirrup incipient damage aging effect mechanical property

Published: Online: 2022-12-09

CLC number:

TU502+6

Fund:National Natural Science Foundation of China (52108147,51878319),the Jiangsu Planned Projects for Postdoctoral Research Funds (2020Z350) and the Senior Talent Foundation of Jiangsu University (20JDG19).

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	Articles by authors
	ZHENG Yulong
	LIU Xiang
	LU Chunhua
	BU Senzhuang
	KOSA Kenji

Cite this article:

ZHENG Yulong,LIU Xiang,LU Chunhua, et al. Incipient Damage When Bending Stirrup and Its Influence on Mechanical Properties[J]. Materials Reports, 2022, 36(23): 21110130-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.21110130 OR http://www.mater-rep.com/EN/Y2022/V36/I23/21110130

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