Numerical Study on Parametric Analysis of Reinforced Concrete Column under Blast Loading

Rajkumar, D. Shoba; Senthil, R.; Kumar, B. Bala Murali; AkshayaGomathi, K.; Velan, S. Mahesh

doi:10.1061/(asce)cf.1943-5509.0001382

Cited by 34 publications

(12 citation statements)

References 21 publications

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“…Other studies conducted at higher scaled distances (greater than 0.5 m/kg 1/3 ) also found that increasing transverse reinforcement ratio improved column performance in terms of maximum lateral displacement (Bao & Li, 2010;Rajkumar et al, 2020). However, the present study shows that reducing transverse reinforcement spacing is effective at controlling both maximum and residual lateral displacements at near-contact scaled distances as well.…”

Section: Effect Of Transverse Reinforcementcontrasting

confidence: 80%

“…Furthermore, the spiral reinforcement provided better confinement to the core and reduced the degree of spalling. Rajkumar et al (2020) found a similar observation when investigating column shape at scaled distances greater than 0.75 m/kg 1/3 . The study concluded that circular columns performed better in terms of peak deflections, but it was also noted that some discrepancies in residual deflections existed.…”

Section: Effect Of Column Shapesupporting

confidence: 70%

“…Finally, as column height increases, the amount of pressure and impulse the UHPC column can sustain decreases. Rajkumar et al (2020) used the LOAD_BLAST_ENHANCED function in LS-DYNA to investigate the effect of column geometry under various blast loads. The FE model was verified against field test results of a quarter-scale RC column subjected to a blast at a scaled distance of 0.535 m/kg 1/3 .…”

Section: Literature Reviewmentioning

confidence: 99%

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Performance Assessment of RC Columns Under Near-Field Blast Loading Using CFD Modelling

Vidjen¹

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This study investigates the effects of various design parameters on the performance of reinforced concrete columns under near-field blast loads, specifically for scaled distances less than 0.4 m/kg 1/3 . The computational fluid dynamics analysis method in LS-DYNA is used to model the detonation process of the explosive, the propagation of the blast wave, and its interaction with the structure. The model's ability to accurately predict blast loads and simulate structural response is verified against experimental data from the literature. Using the verified model, the influence of transverse reinforcement spacing, concrete cover, axial load ratio, and column cross-section shape on the structural performance is evaluated based on several parameters including the lateral displacement, the extent of the damage zone, material stress condition, and residual axial capacity.Based on the analysis results, it is concluded that a reduction in the transverse reinforcement spacing reduces the lateral displacement and spall length, while increasing the residual axial capacity. Also, a reduction in concrete cover is found to reduce spalling but has a minimal effect on the lateral displacements. Lastly, it is shown that increasing the axial load ratio significantly reduce the lateral displacement, but past a certain point can lead to shear failure near the support.

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Section: Effect Of Transverse Reinforcementcontrasting

confidence: 80%

Section: Effect Of Column Shapesupporting

confidence: 70%

Section: Literature Reviewmentioning

confidence: 99%

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Performance Assessment of RC Columns Under Near-Field Blast Loading Using CFD Modelling

Vidjen¹

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“…Rajkumar et al [74] examined 45 numerical models of reinforced concrete columns in scale 1:4 (85 mm × 85 mm × 900 mm) in LS-Dyna. In the models, the behavior of four different cross-sections (circular, octagonal, hexagonal and square) on the blast load was examined.…”

Section: Parametersmentioning

confidence: 99%

Blast Loaded Columns—State of the Art Review

Lukić¹,

Draganić²

2021

Applied Sciences

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The ever-present threat of terrorist attacks in recent decades gives way to research towards blast-resistant design of structures. Columns, as one of the main load-bearing elements in residential buildings and bridges, are becoming interesting targets in bombing attacks. Research of column blast load behavior leads toward increased safety by identifying shortcomings and problems of those elements and acting accordingly. Field tests and numerical simulations lead to the development of new blast load mitigation technics, either in the design process or as a retrofit and strengthening of existing elements. The article provides a state-of-the-art literature review of filed blast load tests and numerical simulations of a bridge and building columns.

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“…Later in the experimental studies conducted by Braimah and Siba (2018) and Chen et al (2019), the effects of near-field or close-in explosions on square RC columns were investigated. Many researchers (Abladey and Braimah, 2014; Kyei and Braimah, 2017; Li and Hao, 2014; Rajkumar et al, 2020) have carried out numerical studies to investigate the blast response of RC columns using high-fidelity physics-based computer programs and conducted extensive parametric analyses to determine the influence of key critical design parameters on the behavior of RC columns under blast loading.…”

Section: Introductionmentioning

confidence: 99%

Residual axial capacity of circular reinforced concrete columns subjected to contact explosions

Zong

et al. 2022

Advances in Structural Engineering

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The threat of terrorist bombing attacks on critical infrastructure has attracted a lot of attentions over the past decades. Contact explosion with a small explosive charge mass can cause severe damage to RC columns. Since columns are the primary load-bearing components in structures, the failure of critical columns can initiate collapse of the entire structure and result in devastating consequences associate with significant casualties and economic losses. To prevent catastrophic structural collapse, the most critical requirement of blast-damaged columns would be the residual capacity to withstand axial load. In this study, the residual axial load-carrying capacity of RC columns damaged by contact explosions was numerically investigated. A high-fidelity physics-based numerical model of RC columns under contact explosions was developed using the non-linear dynamic analysis program LS-DYNA with Arbitrary-Lagrangian–Eulerian (ALE) and Fluid-Structure Interaction (FSI) algorithms. The numerical model was comprehensively validated with existing experimental results in literature. An extensive parametric study was carried out to determine the effect of critical design parameters, including explosive charge mass, column diameter, longitudinal reinforcement ratio, and transverse reinforcement ratio on the residual axial load-carrying capacity of RC columns after contact explosions. The damage degree of the blast-damaged columns was quantitatively analyzed with a damage criterion based on the residual axial load-carrying capacity. Based on the parametric analysis results, an empirical formula was developed through multivariable regression analysis method for prediction of the damage degree and residual axial load-carrying capacity of blast-damaged RC columns under contact explosions. The proposed empirical formula can be utilized in preliminary design of RC columns against contact explosions and failure risk assessment of RC columns after contact explosions.

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Numerical Study on Parametric Analysis of Reinforced Concrete Column under Blast Loading

Cited by 34 publications

References 21 publications

Performance Assessment of RC Columns Under Near-Field Blast Loading Using CFD Modelling

Performance Assessment of RC Columns Under Near-Field Blast Loading Using CFD Modelling

Blast Loaded Columns—State of the Art Review

Residual axial capacity of circular reinforced concrete columns subjected to contact explosions

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