Steel Mechanical Properties at Different Strain Rates

Soroushian, Parviz; Choi, Ki Bong

doi:10.1061/(asce)0733-9445(1987)113:4(663)

Cited by 120 publications

(45 citation statements)

References 2 publications

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“…Evident effects of strain rates on the mechanical properties of rebars are found in their tensile tests under a high strain rate [12]. Both their yield and ultimate strengths increase when the strain rate is increased, but the yield strength has a more obvious increment than the ultimate strength [13,14]. The test results of corroded medium and low strength rebars under dynamic loadings have indicated that the strain rate effect decreased with the increase of corrosion degree [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation into Corrosion Effect on Mechanical Properties of High Strength Steel Bars under Dynamic Loadings

Chen

Zhang

Yang

et al. 2018

International Journal of Corrosion

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The tensile behaviors of corroded steel bars are important in the capacity evaluation of corroded reinforced concrete structures. The present paper studies the mechanical behavior of the corroded high strength reinforcing steel bars under static and dynamic loading. High strength reinforcing steel bars were corroded by using accelerated corrosion methods and the tensile tests were carried out under different strain rates. The results showed that the mechanical properties of corroded high strength steel bars were strain rate dependent, and the strain rate effect decreased with the increase of corrosion degree. The decreased nominal yield and ultimate strengths were mainly caused by the reduction of cross-sectional areas, and the decreased ultimate deformation and the shortened yield plateau resulted from the intensified stress concentration at the nonuniform reduction. Based on the test results, reduction factors were proposed to relate the tensile behaviors with the corrosion degree and strain rate for corroded bars. A modified Johnson-Cook strength model of corroded high strength steel bars under dynamic loading was proposed by taking into account the influence of corrosion degree. Comparison between the model and test results showed that proposed model properly describes the dynamic response of the corroded high strength rebars.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation into Corrosion Effect on Mechanical Properties of High Strength Steel Bars under Dynamic Loadings

Chen

Zhang

Yang

et al. 2018

International Journal of Corrosion

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“…In comparison with Table 1, this strain rate would increase the stress and strain capacities of concrete and its steel reinforcement [9]. The increased compressive strength ' cd f of concrete under dynamic loading can be calculated as: [10] proposed a model for stress-strain response of steel under various loading rates. They reported that the increase in steel yielding stress, ultimate strength, and ultimate strain are proportional to the logarithmic function of the strain rate, as follows: …”

Section: Structure Responsementioning

confidence: 99%

Dynamic Response of Structure under Blast Load

Makovička¹,

Makovicka²

2016

JCEA

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Abstract:The paper follows from the theory of explosion and interaction of an impact wave formed by the explosion and a structure. Firstly, the paper determines the parameters of the blast wave excited by a small charge explosion. The empirical formulas on the basis of our own experimental results are shown and used for the structure analysis. Evaluations of structures loaded by an explosion based on dynamic response in rotations round the central line of plate or beam systems during the dynamic load of this type is discussed in the paper and comparison of own limit values and published ones is presented. Blast loads typically produce very high strain rates  in the range of 10 -2 to 10 -4 s -1 . The effect of strain rate for concrete material is discussed. The formulas for increased compressive strength of concrete and steel reinforcement are presented. The ductility of structural members is influenced by the corresponding values under high strain rate of reinforcement. Damage to the structure is assessed accordingly firstly by the angle of rotation of the middle axis/surface, and secondly by the limit internal forces of the selected structure. The extreme nature of blast resistance makes it necessary to accept that structural members have some degree of inelastic response in most cases. This enables the application of structure dissipation using the ductility factor and increased of concrete strength. The limits are correlated with qualitative damage expectations. The methodology of dynamic response assessment and its application to the simple bridge structure is discussed.

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“…Soroushian and Choi proposed a model for stress-strain response of steel under various loading rates [21]. They reported that the increases in steel yielding stress, ultimate strength, and ultimate strain are proportional to the logarithmic function of the strain rate, as follows: …”

Section: Steel Reinforcementmentioning

confidence: 99%

Performance of frp-retrofitted concrete bridge columns under blast loading

Zheng¹,

Zohrevand²,

Erdoğan³

et al. 2014

Int. J. CMEM

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Contrary to military or essential government buildings, most bridges are designed without any consideration for blast resistance. Fiber-reinforced polymers (FRPs) can provide an effective means for strengthening of critical bridges against such loading. This study has focused on the effectiveness of FRP retrofi tting in the dynamic response of reinforced concrete bridge columns under blast loading. Using a simplifi ed equivalent I-section with a virtual material lumped at the two fl anges; a lightly meshed uniaxial fi nite element model was developed and successfully validated against previous studies. The proposed model was then used for a thorough parametric study on the blast resistance of bridge substructures in the form of a single-column, two-column pier frame, and an entire bridge. The study showed the benefi ts of strengthening with composites against blast loading. The FRP tensile strength and diameter-to-thickness ratio, steel reinforcement ratio, and column length and damping ratio significantly affect the blast resistance of an FRP-retrofi tted bridge. Finally, based on the parametric study results, predictive equations with multiple linear regression and high order terms were developed statistically for the FRP retrofi t design of single columns against blast loading. Keywords: Blast, bridges, concrete, fi ber-reinforced polymer (FRP), fi nite element modeling, retrofi t. INTRODUCTIONIn the face of terrorist attacks on landmark buildings and threats against vital lifeline bridges, security of transportation arteries is of grave concern. Contrary to military or essential government buildings, most bridges are designed without any consideration for blast resistance [1,2]. Crucial bridge components such as reinforced concrete (RC) girders and columns are vulnerable to large blast loads from close-by explosions, leading to progressive span collapse or catastrophic shearing off of columns. Therefore, it is imperative to develop techniques to harden critical bridges against potential blast loading.The use of fi ber-reinforced polymers (FRPs) for retrofi tting of RC buildings to resist explosions has gained interest since the Oklahoma City bombing [3,4]. FRP wraps can confi ne RC columns susceptible to shearing off by blast impulse, enhance their capacity, and limit their lateral defl ections. The use of FRP sleeves or tubes in new columns and piles has also proven effective under impact and seismic loads [5][6][7]. A number of studies have assessed the effect of FRP retrofi tting on the dynamic response of RC structures. Elsanadedy et al. studied the effect of carbon (C) FRP retrofi tting on the blast resistance of RC circular columns [8]. Their results showed that CFRP retrofi tting can signifi cantly decrease the blast damage and maximum lateral defl ection experienced by RC columns under explosions. Crawford et al. developed a design procedure for using steel jackets and FRP wraps to improve the survivability of RC columns under blast loading [9]. Williamson and Winget discussed the potential e...

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Steel Mechanical Properties at Different Strain Rates

Cited by 120 publications

References 2 publications

Experimental Investigation into Corrosion Effect on Mechanical Properties of High Strength Steel Bars under Dynamic Loadings

Experimental Investigation into Corrosion Effect on Mechanical Properties of High Strength Steel Bars under Dynamic Loadings

Dynamic Response of Structure under Blast Load

Performance of frp-retrofitted concrete bridge columns under blast loading

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