Behavior of two-way RC slab with different reinforcement orientation layouts of tension steel under drop load impact

Anas, S.M.; Alam, Mehtab; Shariq, Mohd

doi:10.1016/j.matpr.2022.08.509

Cited by 27 publications

(49 citation statements)

References 46 publications

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“…The apparent strength of concrete can improve remarkably at such high-strain rates, in contrast to its quasi-static counterpart. The dynamic increase factor (DIF), that is, the ratio of the dynamic to static strength of concrete, is a function of strain rate ε˙, as per the experimental studies (Anas et al, 2022g, 2022f, Anas and Alam, 2022, 2022c; Pereira et al, 2014; Zhao et al, 2019). However, the techniques managing the experimentally observed DIF stand to be a matter of discussion.…”

Section: Constitutive Materials Models Used In Modeling Reinforced Co...mentioning

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: Constitutive Materials Models Used In Modeling Reinforced Co...mentioning

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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“…The strain-rate or loading rate effects on materials' strength are considered per UFC3-340-02 (2008) and fib Model Code 2010, reported in Refs. (Shariq et al, 2022a;Tahzeeb et al, 2022a;Anas et al, 2022e). General CDP parameter values used for concrete modeling are listed in Table 1.…”

Section: Concrete Modelingmentioning

confidence: 99%

“…An explosion is the combustion of a chemical explosive that is initiated suddenly through rapid oxidation, and the generated wave propagates at an expeditious speed (Anas et al, 2021a;IS 4991, 1968;Goel and Matsagar, 2014;TM 5-1300TM 5- , 1990Anas et al, 2021b;Anas et al, 2021c;Anas et al, 2021d;Anas et al, 2022c;Anas et al, 2022d;Ahmadi et al, 2021;Anas et al, 2021e;Anas et al, 2021f;Anas and Alam, 2022c;Anas et al, 2022e;Anas et al, 2022f;Anas et al, 2022g;Anas et al, 2022h;Anas et al, 2022I;Shariq et al, 2022a;Tahzeeb et al, 2022a;Tahzeeb et al, 2022b;Tahzeeb et al, 2022c;Ul Ain et al, 2021;Ul Ain et al, 2022). The speed of the explosion wave varies from 6000m/s to 8000m/s (Anas et al, 2021a;TM 5-1300TM 5- , 1990.…”

Section: Explosive Load Modelingmentioning

confidence: 99%

“…Several studies have been conducted in the past 2 decades addressing the behavior of reinforced concrete (RC) columns under extreme blast loadings (Elsanadedy et al, 2011;Mutalib and Hao, 2011;Bogosian and Heidenreich, 2012;Fujikake and Aemlaor, 2013;Jayasooriya et al, 2014;Li and Hao, 2014;Burrell et al, 2015;Cui et al, 2015;Jacques et al, 2015;Zhang et al, 2015;Zhang et al, 2016;Hu et al, 2018;Wang et al, 2018;Rajkumar et al, 2019;Alsendi and Eamon, 2020;Anas et al, 2022e;Anas et al, 2022h;Shariq et al, 2022a;Tahzeeb et al, 2022a;Tahzeeb et al, 2022b;Tahzeeb et al, 2022c;Anas and Alam, 2022d;Anas et al, 2022I;Shariq et al, 2022c). Moretti and Tassios (2018) tested eight RC columns with additional transverse reinforcement in the form of open ties in both directions under axial compression.…”

Section: Introductionmentioning

confidence: 99%

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Role of cross-diagonal reinforcements in lieu of seismic confining stirrups in the performance enhancement of square RC columns carrying axial load subjected to close-range explosive loading

et al. 2022

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Exposure of building infrastructures to accidental or intentional blasts is an extreme load condition that may cause irreparable damage leading to the collapse of buildings. Columns being principal elements are the most important for the stability and safety of the buildings under accidental explosions and subversive blast events and therefore attract the attention of structural engineers and researchers. Some recent examples are the Beirut seaport explosion (August 2020), the explosion at an ammunition warehouse in Ryazan City of Russia (October 2020), the gas explosion in China’s Hubei Province (June 2021), a blast at a chemical factory on the outskirts of Bangkok (July 2021), and the explosion on a container ship docked at Dubai’s Jebel Ali Port (July 2021). In the crises like ongoing conflict between Russia and Ukraine, the enhanced response of the principal components of a structure may save the life of the building users by limiting severe damage to the structure. In this study, three experimentally tested 3000-mm-long normal strength concrete columns, 300mm x 300mm, provided with (i) conventional reinforcement, (ii) seismic reinforcements over top and bottom confining regions (600 mm), and (iii) seismic reinforcement over confining and mid-height regions, carrying an axial working load of 950 kN available in the literature, are modeled in the ABAQUS 2020 code and are subjected to 82 kg TNT close-range explosive load at a scaled distance 1.0 m/kg1/3 using the software’s explicit module. In addition to this, one column with seismic reinforcement over its entire length has been considered and modeled. The concrete damage plasticity model is explored for nonlinear elastic and inelastic behaviors, degradation of stiffness, and loading rate effect on concrete. Following the validation of the numerical models, the seismic reinforcements of the columns have been replaced by the cross-diagonal reinforcements between the conventional stirrups with the same axial load. Blast performance of the columns with the seismic reinforcements and with replaced diagonal reinforcements is critically examined and discussed. The results show that the application of cross-diagonal reinforcements as a replacement for the seismic reinforcements enhances the blast resistance of the reinforced concrete column significantly by reducing the damage and displacement.

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“…The interest for structure safety has expanded from structures of national importance to civilian buildings after the very recent accidental explosion incident that took place at Bangladesh due to devastating chemical container depot explosion (2022), blast Jebel Ali port in Dubai (2021), Beirut seaport explosion in Lebanon (2020), and ammunition depot in the Ryazan city (Russia) (2020) resulted in huge property damage to the nearby structures including residential and commercial buildings and serious injuries to the civilians [6,16,22]. Due to looming threat of blast, there is imminent need of engineers to get acquainted with the phenomenon of explosion in order to design structures with the explosion loading and evaluate the material response/damage to abate the casualties induced out of it [43,44].…”

Section: Explosion Loadingmentioning

confidence: 99%

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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Behavior of two-way RC slab with different reinforcement orientation layouts of tension steel under drop load impact

Cited by 27 publications

References 46 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

Role of cross-diagonal reinforcements in lieu of seismic confining stirrups in the performance enhancement of square RC columns carrying axial load subjected to close-range explosive loading

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

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