Study on mechanical properties of the kinked rebar under high speed dynamic tension

LIU Sijia; CHEN Li; CAO Mingjin; ZHOU Donglei; FAN Yuan; CHEN Xin

doi:10.11883/bzycj-2021-0328

Volume 42 Issue 5

May 2022

Turn off MathJax

Article Contents

Article Navigation > Explosion And Shock Waves > 2022 > 42(5): 053101

LIU Sijia, CHEN Li, CAO Mingjin, ZHOU Donglei, FAN Yuan, CHEN Xin. Study on mechanical properties of the kinked rebar under high speed dynamic tension[J]. Explosion And Shock Waves, 2022, 42(5): 053101. doi: 10.11883/bzycj-2021-0328

Citation:

LIU Sijia, CHEN Li, CAO Mingjin, ZHOU Donglei, FAN Yuan, CHEN Xin. Study on mechanical properties of the kinked rebar under high speed dynamic tension[J]. Explosion And Shock Waves, 2022, 42(5): 053101. doi: 10.11883/bzycj-2021-0328

Citation:

PDF( 2385 KB)

Study on mechanical properties of the kinked rebar under high speed dynamic tension

doi: 10.11883/bzycj-2021-0328

1.
Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China
2.
The People’s Liberation Army Unit 93204, Beijing 100068, China

Received Date: 2021-07-30
Rev Recd Date: 2021-11-11

Available Online: 2022-03-11

Publish Date: 2022-05-27

Abstract

Abstract

Aiming at new technology of the kinked rebar which can improve the resistance of concrete beams to impact and blast loading, the mechanism of rapid tensile deformation of the kinked rebar was revealed through theoretical analysis combined with dynamic impact tensile tests. The influences of the tensile velocity and the bending height of the kinked rebar on its tensile strength were analyzed. According to the mechanism of tensile deformation, the calculation method of the static elastic ultimate strength of the kinked rebar was determined by using the classical plastic mechanics theory, and the proposed calculation method was modified based on the existing literature data to consider the error caused by the Bauschinger effect. A new concept of equivalent tensile strain rate of the kinked rebar was put forward, the kinked rebar was regarded as an equivalent material, and the average strain rate of the bending part of the rebar was defined as the equivalent tensile strain rate of the kinked rebar. Considering the influence of the tensile velocity and the bending height of the kinked rebar, the calculation model of dynamic increase factors (DIF) of the elastic ultimate strength was established, referring to the form of the Johnson-Cook material constitutive model. The results show that the pre-bending kink results in the section bending moment of the steel bar during force straightening and the mechanical properties of the kinked rebar have an obvious strain rate effect. The tensile yield strength first increases and then decreases with the increase of the bending height of the kinked rebar. There is an optimal bending height for the kinked rebar at high strain rates, which can maximize the dynamic amplification factor of the tensile strength of the kinked rebar. The research results can provide a basis for further promotion of the application of the kinked rebar technology in protection engineering.
- kinked rebar,
- dynamic tension,
- equivalent strain rate,
- dynamic increase factors (DIF),
- strain rate effect

FullText(HTML)

References(13)

References

[1]	FENG P, QIANG H L, QIN W H, et al. A novel kinked rebar configuration for simultaneously improving the seismic performance and progressive collapse resistance of RC frame structures [J]. Engineering Structures, 2017, 147: 752–767. DOI: 10.1016/j.engstruct.2017.06.042.
[2]	杨健翔. 起波钢筋RC梁柱子结构抗连续倒塌性能研究 [D]. 南京: 东南大学, 2019: 1−121. DOI: 10.27014/d.cnki.gdnau.2019.001378. YANG J X. Study on progressive collapse behavior of RC beam-column substructure with a kinked rebar configuration [D]. Nanjing: Southeast University, 2019: 1−121. DOI: 10.27014/d.cnki.gdnau.2019.001378.
[3]	樊源, 陈力, 任辉启, 等. 起波配筋RC梁抗爆作用机理及抗力动力系数的理论计算方法 [J]. 爆炸与冲击, 2019, 39(3): 035102. DOI: 10.11883/bzycj-2018-0181. FAN Y, CHEN L, REN H Q, et al. Blast-resistant mechanism of RC beam with kinked rebar and calculation method of dynamic resistance coefficient [J]. Explosion and Shock Waves, 2019, 39(3): 035102. DOI: 10.11883/bzycj-2018-0181.
[4]	陈力, 任辉启, 樊源, 等. 强动载作用下起波配筋梁抗力性能的试验研究 [J]. 土木工程学报, 2021, 54(10): 1–8;19. DOI: 10.15951/j.tmgcxb.2021.10.001. CHEN L, REN H Q, FAN Y, et al. Experimental study on the resistance of RC beam with kinked rebar under severe dynamic loading [J]. China Civil Engineering Journal, 2021, 54(10): 1–8;19. DOI: 10.15951/j.tmgcxb.2021.10.001.
[5]	陈肇元, 王志浩, 方秦. 第十一篇防护工程 [M] // 中国土木工程指南. 2版. 北京: 科学出版社, 2000: 1528−1529. CHEN Z Y, WANG Z H, FANG Q. Chapter eleven. Protection engineering [M] // Guide to Civil Engineering in China. 2nd ed. Beijing: Science Press, 2000: 1528−1529.
[6]	方秦, 柳锦春. 地下防护结构 [M]. 北京: 中国水利水电出版社, 2010: 228−234. FANG Q, LIU J C. Underground protective structure [M]. Beijing: China Water and Power Press, 2010: 228−234.
[7]	SOROUSHIAN P, CHOI K B. Steel mechanical properties at different strain rates [J]. Journal of Structural Engineering, 1987, 113(4): 663–672. DOI: 10.1061/(ASCE)0733-9445(1987)113:4(663).
[8]	CEB. Concrete structures under impact and impulsive loading [R]. Lausanne: Comite Euro-International du Beton, 1988.
[9]	ROHR I, NAHME H, THOMA K. Material characterization and constitutive modelling of ductile high strength steel for a wide range of strain rates [J]. International Journal of Impact Engineering, 2005, 31(4): 401–433. DOI: 10.1016/j.ijimpeng.2004.02.005.
[10]	林峰, 顾祥林, 匡昕昕, 等. 高应变率下建筑钢筋的本构模型 [J]. 建筑材料学报, 2008, 11(1): 14–20. DOI: 10.3969/j.issn.1007-9629.2008.01.003. LIN F, GU X L, KUANG X X, et al. Constitutive models for reinforcing steel bars under high strain rates [J]. Journal of Building Materials, 2008, 11(1): 14–20. DOI: 10.3969/j.issn.1007-9629.2008.01.003.
[11]	李敏, 李宏男. 建筑钢筋动态试验及本构模型 [J]. 土木工程学报, 2010, 43(4): 70–75. DOI: 10.15951/j.tmgcxb.2010.04.012. LI M, LI H N. Dynamic test and constitutive model for reinforcing steel [J]. China Civil Engineering Journal, 2010, 43(4): 70–75. DOI: 10.15951/j.tmgcxb.2010.04.012.
[12]	黄晓莹, 陶俊林. 三种建筑钢筋材料高应变率下拉伸力学性能研究 [J]. 工程力学, 2016, 33(7): 184–189. DOI: 10.6052/j.issn.1000-4750.2014.12.1064. HUANG X Y, TAO J L. Tensile mechanical properties research of three construction steel bars in high strain rate [J]. Engineering Mechanics, 2016, 33(7): 184–189. DOI: 10.6052/j.issn.1000-4750.2014.12.1064.
[13]	YU T X, JOHNSON W. Influence of axial force on the elastic-plastic bending and springback of a beam [J]. Journal of Mechanical Working Technology, 1982, 6(1): 5–21. DOI: 10.1016/0378-3804(82)90016-X.