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Materials 2016, 9(12), 1013; doi:10.3390/ma9121013

Strain Rate Behavior in Tension of Reinforcing Steels HPB235, HRB335, HRB400, and HRB500

1,2,* , 1
,
1
and
3
1
Department of Structural Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
2
Key Laboratory of Advanced Civil Engineering Materials, Tongji University, 1239 Siping Road, Shanghai 200092, China
3
Shanghai Dushi Green Engineering Co., Ltd., 2880 Shenkun Road, Shanghai 20110, China
*
Author to whom correspondence should be addressed.
Academic Editor: Richard Thackray
Received: 16 November 2016 / Revised: 5 December 2016 / Accepted: 9 December 2016 / Published: 15 December 2016
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Abstract

The strain rate effect of reinforcing steel bars is generally indispensable for modeling the dynamic responses of reinforced concrete structures in blast and impact events. A systematic experimental investigation was conducted on the strain rate behavior of reinforcing steel bar grades HPB235, HRB335, HRB400, and HRB500 which are widely used in the field of civil engineering in China. The dynamic testing was performed using a servo-hydraulic Instron VHS160/100-20 in a strain rate range from 2 to 75 s−1. Stress-strain curves at preset strain rates were obtained. The test data were then used to derive the parameters in a model based on the dynamic increase factors (DIFs) of strengths and the Johnson–Cook constitutive model. Results indicated that a significant strain rate effect was observed for the four rebar grades. The dynamic yield strengths increased from 13% to 41% and their ultimate strengths improved from 9% to 19% in the strain rate range during testing. The strain rate behavior of the four rebar grades could be appropriately predicted using the parameters in the model based on the DIFs of strengths and the Johnson–Cook model. View Full-Text
Keywords: reinforcing steel bar; rebar; strain rate; impact; constitutive model reinforcing steel bar; rebar; strain rate; impact; constitutive model
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MDPI and ACS Style

Lin, F.; Dong, Y.; Kuang, X.; Lu, L. Strain Rate Behavior in Tension of Reinforcing Steels HPB235, HRB335, HRB400, and HRB500. Materials 2016, 9, 1013.

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