Strengthening of braced unreinforced brick masonry wall with (i) C-FRP wrapping, and (ii) steel angle-strip system under blast loading

Anas, S.M.; Alam, Mehtab; Umair, Mohammad

doi:10.1016/j.matpr.2022.01.335

Cited by 28 publications

(33 citation statements)

References 38 publications

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“…As the expansion of the hot air goes on, cooling occurs, and movement of the compressed air develops vacuum, that is, pressure drops below the atmospheric pressure, and it is called the negative phase of the blast wave (ASCE/SEI 59-11, 2011; IS 4991, 1968; TM 5-1300, 1990; UFC 3-340-02, 2008). However, the negative blast wave effect is usually not incorporated in the blast analysis of the structures (Anas and Alam, 2021a, 2021b, 2022a, 2022b; Anas et al, 2020a, 2020b, 2020c, 2021a, 2021b, 2021c, 2021d, 2021e, 2021f, 2022a, 2022b, 2022c, 2022d, 2022e; Kyei and Braimah, 2017; TM 5-1300, 1990; UFC 3-340-02, 2008).…”

Section: Explosions and Mechanism Of Blast Loadingmentioning

confidence: 99%

“…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%

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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%

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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“…In Refs. (Sadraie et al, 2019;, 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;Anas et al, 2022i;Anas et al, 2022j;Ahmadi et al, 2022;Shariq et al, 2022b;Shariq et al, 2022c;Shariq et al, 2022d;Anas et al, 2022k;Anas and Alam, 2022d;Anas et al, 2022m;Anas et al, 2022n;Shariq et al, 2022e;Anas et al, 2022o;Anas et al, 2022p;Shariq et al, 2022f;Anas and Alam, 2022e;Shariq et al, 2022g;Anas et al, 2022q;Shariq et al, 2022h;Anas et al, 2022r) employ the Concrete Damage Plasticity (CDP) model, which takes the strain-rate effect into account. A damage plasticity model can be used to describe the mechanical behavior of concrete.…”

Section: Problem Statement and Methodology Usedmentioning

confidence: 99%

Ultra high performance concrete and C-FRP tension Re-bars: A unique combinations of materials for slabs subjected to low-velocity drop impact loading

Anas

Alam²,

Isleem³

et al. 2022

Front. Mater.

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In this research work, different combinations of normal strength concrete (NSC), ultra-high-performance concrete (UHPC), and steel fiber-reinforced UHPC (SFR-UHPC) concrete with re-bars of conventional steel and of carbon fiber-reinforced polymer (C-FRP) are used in a two-way square slab of size 1000mm x 1000mm x 75mm subjected to 2500 mm free-fall impact loading. Experimental arrangement consisting of 105 kg dropping weight with the circular flat impacting face of 40 mm diameter used for carrying out impact test is modeled using a high-fidelity physics-based finite element computer code, ABAQUS/Explicit-v.6.15. After validating the experimental results of the NSC slab with steel bars, analyses are extended by replacing NSC and steel bars with UHPC/SFR-UHPC and C-FRP bars, respectively, under the same dropping weight. Only the remote face (tension face) of the slabs is provided with the re-bars. Widely employed and available with the ABAQUS, the Concrete Damage Plasticity model with strain-rate effects has been entrusted for simulating the concrete plastic response. Re-bars of steel are idealized with the Johnson-Cook plasticity damage model. C-FRP re-bars are defined with the classical plasticity model following the elastic-plastic constitutive laws. The impact responses of the slabs consisting of NSC/UHPC/SFR-UHPC concrete with re-bars of steel, and C-FRP combinations considered are discussed and compared. Slabs made of UHPC/SFR-UHPC concrete with the C-FRP re-bars are found to offer a promising combination of materials to withstand low-velocity impact load with little damage and extraordinary impact performance.

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“…There are three primary kinds of models now in use. Utilizing Detailed Micrographs is the first technique [48].…”

Section: Simulation Of Brick Masonrymentioning

confidence: 99%

A Review on Numerical Modelling of Brick Masonry Structures Against Blast Load

2022

IRJMETS

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Examining the number of persons killed and the amount of money lost in major terrorist attacks over the last few decades indicates a shocking rising trend. Due to the prevalence of terrorist acts and the frequency with which engineering structures fail under blast stress, scientists and structural engineers have lately been interested in this issue. Since the widespread accessibility of small explosive charge devices containing prevailing and long-range components of explosives, the danger of explosions has grown considerably. As a result, it is vital to immediately study and develop structures that can endure these extreme stress levels, as they may avert such disasters. The objective of a blast load study is to predict how a structure will react to explosion loads. This research is a literature review of the damaging effects of blast variables such as incidence angle, standoff distance, explosive type, and charge weight. In addition, it would be too expensive to test each prototype experimentally to sustain the explosion load. Consequently, several computational based softwares predicting blast loads have been investigated, as well as particular strategies that may be adopted to mitigate the effects of blast pressure. This paper gives basic information on blast theory to assist researchers and structural engineers in understanding this particular kind of stress.

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Strengthening of braced unreinforced brick masonry wall with (i) C-FRP wrapping, and (ii) steel angle-strip system under blast loading

Cited by 28 publications

References 38 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

Ultra high performance concrete and C-FRP tension Re-bars: A unique combinations of materials for slabs subjected to low-velocity drop impact loading

A Review on Numerical Modelling of Brick Masonry Structures Against Blast Load

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