A comparative performance of columns: reinforced concrete, composite, and composite with partial C-FRP wrapping under contact blast

Tahzeeb, Rafat; Alam, Mehtab; Muddassir, S.M.

doi:10.1016/j.matpr.2022.03.367

Cited by 27 publications

(7 citation statements)

References 24 publications

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“…The dynamic response of a structure or its element can be studied through live explosion testing or alternatively by numerical simulation. Numerical modeling uses non-linear dynamic finite element analysis (Anas and Alam, 2022a, 2022b; Anas et al, 2021b, 2022a, 2022b, 2022c, 2022d, 2022e; Tahzeeb et al, 2022; Shariq et al, 2022). Furthermore, it provides a possibility of examination of a comprehensive number of design variables relevant for blast resistance of structures.…”

Section: Explosions and Mechanism Of Blast Loadingmentioning

confidence: 99%

Evaluation of critical damage location of contact blast on conventionally reinforced one-way square concrete slab applying CEL-FEM blast modeling technique

Anas

Shariq

Alam

et al. 2022

International Journal of Protective Structures

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Nowadays, accidental explosions in residential and factory buildings are common owing to poor maintenance and mishandling of fuel gas and chemical explosive appliances leading to grievous injuries and infrastructure damages. Contact blast on slabs using explosives is noticed as a simpler act of subversion as compared to other components of the building and is more damaging than a close-in blast. In general, damage caused by contact blast is localized in the form of concrete cratering, scabbing, and rupture of the reinforcement. A recently published state-of-the-art review on the performance of reinforced concrete (RC) slabs under contact and close-in explosion loading scenario by the authors (Anas et al., 2021b) reveals the common perception for the location of contact blast to cause maximum damage is the centroid of the slab. It develops a curiosity with sufficient interest to investigate the effect of the location of contact explosive charge on the damage response of the slab. Several numerical techniques such as empirical, ConWEP (semi-empirical), Smooth Particle Hydrodynamics (mesh-free method), and Coupled-Eulerian-Lagrangian (CEL) are in use for simulation of blast loading on structures. Current literature reveals that the CEL is the most advanced and realistic blast modeling technique. This study applies Coupled-Eulerian–Lagrangian (CEL) formulation with finite element method (FEM) using the dynamic computer code ABAQUS/Explicit-v.6.15 to investigate the performance of singly reinforced one-way spanning concrete slab subjected to concentric contact blast loading. The numerical model is validated with the experiment results in the open literature. The validated model is then employed to investigate whether or not the maximum damage is really caused by the central location of the contact blast. For this purpose, one-quarter of the slab with nine symmetrical points (or locations) of contact blast of explosive charge, which reflect the coverage of the entire slab, in contact with the top face of the slab is considered in the study. Two constitutive material models, Concrete Damage Plasticity and Johnson–Cook, with strain rate effects are used to simulate the non-linear behavior of the concrete and steel, respectively. The results reveal that the most critical location of maximum damage to the slab is along the line of symmetry parallel to the supports at an eccentricity of B/4 from the centroid of the slab, where “B” is the width of the one-way slab.

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Section: Explosions and Mechanism Of Blast Loadingmentioning

confidence: 99%

Evaluation of critical damage location of contact blast on conventionally reinforced one-way square concrete slab applying CEL-FEM blast modeling technique

Anas

Shariq

Alam

et al. 2022

International Journal of Protective Structures

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“…Deterioration of stiffness E u is due to unloading and reloading which resulted in development of yield surface, can be computed using Eq. (17).…”

Section: Concrete Compression Behaviourmentioning

confidence: 99%

“…), performance prediction of structure due to these triggering events is a challenging task [10][11][12][13][14]. In general, structures are not designed to resist such explosion-induced loadings and when a load-bearing component of a structure is exposed to such catastrophic explosive event, the process of failure is initiated with damage to the component [15][16][17]. The damaged component loses its load-carrying capacity [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…In general, structures are not designed to resist such explosion-induced loadings and when a load-bearing component of a structure is exposed to such catastrophic explosive event, the process of failure is initiated with damage to the component [15][16][17]. The damaged component loses its load-carrying capacity [15][16][17]. The degree of the damage occurred to the member decides overall damage to the structure which could be of disproportionate nature or even a progressive kind of collapse [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The damaged component loses its load-carrying capacity [15][16][17]. The degree of the damage occurred to the member decides overall damage to the structure which could be of disproportionate nature or even a progressive kind of collapse [15][16][17]. It is therefore imperative to civil structural engineering designers to protect structures from the looming threat of blast and its consequences [11,15].…”

Section: Introductionmentioning

confidence: 99%

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Blast performance prediction of circular column with improvised equivalent helical mesh transverse reinforcement substituted for single helix, UHPFRC plaster and CFRP wrapping under close-in blast

Tahzeeb

Alam

Muddassir

2022

Preprint

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The explosion from bombshells develops an excessively high impulsive load on structures. Columns being important key load-bearing members of a structure are vital to providing strength and stability to the building. A circular column performs better than a square/rectangular column under blast loading. Following the validation of experimentally tested square RC column with seismic lateral reinforcement carrying 950kN axial load subjected to an explosive charge of 100kg ANFO (82kg-TNT equivalent) at a scaled distance of 1.00m/kg1/3 with 10mm mesh size using ABAQUS/EXPLICIT software equipped with concrete damage plasticity (CDP) model, an equivalent circular reinforced concrete (RC) column is considered. It is well known that the performance of the circular RC column with single helical transverse reinforcement is superior compared to circular lateral ties. To improve the blast-impact resistance of circular column provision for helical reinforcement mesh using six bars turning successive bars in opposite direction is attempted in this work. The performance of a column with equivalent helical mesh is compared with the column with single helical transverse reinforcement. Further, UHPFRC plaster, as well as CFRP wrapping, are considered on the two columns under the close-in blast loading. The thickness of UHPFRC plaster and CFRP wrapping considered in this study are 15mm and 2mm respectively. The effect of plaster and wrapping on the two columns in terms of confinement of concrete and stresses in longitudinal steel are investigated and compared. Maximum deflection and damage of the columns are predicted.

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Air-Blast Response of Axially Loaded Clay Brick Masonry Walls with and Without Reinforced Concrete Core

Anas

Alam

Umair

2022

Structural Integrity

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A comparative performance of columns: reinforced concrete, composite, and composite with partial C-FRP wrapping under contact blast

Cited by 27 publications

References 24 publications

Evaluation of critical damage location of contact blast on conventionally reinforced one-way square concrete slab applying CEL-FEM blast modeling technique

Evaluation of critical damage location of contact blast on conventionally reinforced one-way square concrete slab applying CEL-FEM blast modeling technique

Blast performance prediction of circular column with improvised equivalent helical mesh transverse reinforcement substituted for single helix, UHPFRC plaster and CFRP wrapping under close-in blast

Air-Blast Response of Axially Loaded Clay Brick Masonry Walls with and Without Reinforced Concrete Core

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