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

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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

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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

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References(13)

References

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