Effect of Reinforcing Steel on the Impact Resistance of Reinforced Concrete Panel Subjected to Hard-Projectile Impact

Lee, Sang-Ho; Kim, Chunghyeon; Yu, Yongjae; Cho, Jae-Yeol

doi:10.1016/j.ijimpeng.2020.103762

Cited by 21 publications

(9 citation statements)

References 16 publications

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“…It is worth pointing out that penetration resistance F-PC6 was much higher than FPAFC specimens. Based on previous studies [ 28 , 29 ], fibre addition into concrete is the more efficient strategy to enhance the tensile strength, energy absorption, hardness and shear strength. The tremendous amount of energy at the impact surface generated by a projectile was observed by fibre bridging and aggregates’ toughness [ 29 ].…”

Section: Discussion Of Experimental Test Resultsmentioning

confidence: 99%

Response of Novel Functionally-Graded Prepacked Aggregate Fibrous Concrete against Low Velocity Repeated Projectile Impacts

et al. 2021

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Preplaced Aggregate Fibrous Concrete (PAFC) is a newly minted composite that has recently become more popular. The production of PAFC involves two essential processes; first, the fibres and coarse aggregate were filled into the empty framework to form the first layer of a natural skeleton, followed by grout injecting. A cement grout fills the voids in the first layer skeleton with slight compaction. This process is repeated to complete the remaining layers; hence, a type of Functionally-graded Preplaced Aggregate Fibrous Concrete (FPAFC) is obtained. The most recent studies revealed that the literature regarding the high-velocity projectile impact on fibrous concrete is well documented; however, the low-velocity repeated projectile impact on PAFC is still unexplored and needs particular emphasis. This research aims to investigate the FPAFC made with a new type of steel and polypropylene fibres against low-velocity projectile impact to fill this research gap. In the current study, twelve mixes were prepared with mono and hybrid combinations of fibres for pioneering the possible utilization of fibres in FPAFC. The maximum fibre dosage in this study is limited to 2.4%. The projectile impact resistance of FPAFC was assessed in line with penetration depth, front and rear damage surface area, weight loss, damage ratio and failure pattern. Additionally, a simplified analytical model was introduced to compute the ejected composite mass from the tested specimens. The results revealed that the addition of steel fibre in a single layer FPAFC exhibited an increasing compressive strength trend compared to the two/three-layered FPAFC. Furthermore, increasing the dosage of fibre at the bottom and top layers of FPAFC with a hybrid combination alleviates the spalling with an increasing number of impacts. The results from this research offer the reference information for more detailed research and studies of FPAFC under low-velocity projectile impact.

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Section: Discussion Of Experimental Test Resultsmentioning

confidence: 99%

Response of Novel Functionally-Graded Prepacked Aggregate Fibrous Concrete against Low Velocity Repeated Projectile Impacts

et al. 2021

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“…For some of the reinforced slabs, fragments were hindered from detaching from the back of the slabs. This effect is called fragment trapping [9], and is exemplified on slabs A2-1 (a) and A2-4 (b) in Fig. 9.…”

Section: Experimental Observationsmentioning

confidence: 99%

“…Fibre reinforcement may be assumed roughly evenly distributed and can then be accounted for in the constitutive relation [8]. Conventional grid reinforcement have specific locations in the composite structure and should thus be modelled explicitly and separately from the concrete [9,10]. There is extensive literature on the effect of reinforcement on ballistic performance for concrete targets subjected to impact loading, and studies on different types of reinforcement can be found in the open literature, e.g., grid reinforcement [2,[11][12][13], fibre reinforcement [14,15], ferrocement [16], wire mesh [17] and prestressed concrete [18].…”

Section: Introductionmentioning

confidence: 99%

Projectile Impact on Plain and Reinforced Concrete Slabs

Jacobsen,

Kristoffersen,

Dey

et al. 2023

J. dynamic behavior mater.

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Reinforced concrete is a material frequently used in protective structures and infrastructure exposed to extreme loading. In this study, the ballistic perforation resistance of 100 mm thick plain and reinforced concrete slabs impacted by 20 mm ogive-nose steel projectiles was investigated both experimentally and numerically. Two different reinforcement configurations were used to investigate the effect of rebar diameter and spacing. Concrete with nominal unconfined compressive strength of 75 MPa was used to cast material test specimens and slabs. Ballistic impact tests were performed in a compressed gas gun facility. The mechanical properties of the concrete were found using standardised tests and two-dimensional digital image correlation, and the constitutive relation was described by a modified version of the Holmquist-Johnson-Cook model. Finite element models in LS-DYNA reproduced the projectile residual velocity in good agreement with the experimental results. The primary objective of the study was thus to validate a rather simple constitutive relation intended for large scale numerical simulations of concrete structures exposed to ballistic impact loading, while a secondary objective was to investigate the effect of reinforcement on the ballistic perforation resistance of concrete slabs both experimentally and numerically since the literature is somewhat inconsistent on this matter.

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“…In addition to that, it was found that reinforcing bar diameter and yield strength have a minimum effect on the impact resistance [16]. Oucif et al [17] inspected the resistance of reinforced concrete slab against impact and observed that the ballistic resistance of the slab was influenced by the spacing of reinforcing bars instead of quantity of bars. So, this study is focused on improving the ballistic resistance by minimizing the spacing of bars in impact zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of various reinforcement shapes on the ballistic resistance of reinforced concrete slabs

Patnaik

Rajput

2023

J. Phys.: Conf. Ser.

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Concrete structures are often subjected to extreme hazards such as projectile, missile impacts, crash, and blasts. So, evaluation of ballistic resistance of such structures against impact loading has become important. The present study is aimed to evaluate the effects of different shapes of reinforcement on the ballistic performance of slab to improve the state-of-the-art in protective design of structures. A finite element (FE) based model was framed in ABAQUS/Explicit to determine the perforation characteristics of reinforced concrete (RC) targets. The reinforced square targets were impacted by a rigid ogive nose steel projectile for wide range of velocities. Appropriate material models were adopted to simulate the response of concrete and steel reinforcement respectively. The model was validated with the experimental results and further, the validated model was used to perform the numerical simulations. The influence of various shapes of reinforcement on the ballistic resistance of RC targets was evaluated and compared. Among the compared shapes, the extended spiral reinforcement was found to have better ballistic performance. Consequently, the findings of this study can have implications in the design of protective structures.

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Effect of Reinforcing Steel on the Impact Resistance of Reinforced Concrete Panel Subjected to Hard-Projectile Impact

Cited by 21 publications

References 16 publications

Response of Novel Functionally-Graded Prepacked Aggregate Fibrous Concrete against Low Velocity Repeated Projectile Impacts

Response of Novel Functionally-Graded Prepacked Aggregate Fibrous Concrete against Low Velocity Repeated Projectile Impacts

Projectile Impact on Plain and Reinforced Concrete Slabs

Effect of various reinforcement shapes on the ballistic resistance of reinforced concrete slabs

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