Damage diagram of blast test results for determining reinforced concrete slab response for varying scaled distance, concrete strength and reinforcement ratio

Mendonça, Fausto Batista; Urgessa, Girum; Almeida, Luís Eduardo; Rocco, José Atílio Fritz Fidel

doi:10.1590/0001-3765202120200511

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…This diameter is not typically used in solid slabs, however it was considered in this laboratory investigation because it is allowed by the standard [12]. The other diameters are frequently used in solid slabs [27], [34], [37]- [39] and were chosen for verification in structural design.…”

Section: Computational Simulationmentioning

confidence: 99%

Computational and experimental simulation to analyze loss in concrete cover by reinforcement deformation in solid slabs

Maran

Barreto

Molin

et al. 2022

Rev. IBRACON Estrut. Mater.

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Adequate cover thickness contributes to the correct performance of reinforced concrete structures. Spacers are recommended in standards to maintain a concrete cover; however, many regulations do not provide sufficient guidelines for their use, resulting in poor construction. A research program was developed for solid slabs through computational and experimental simulations to minimize errors in the cover by assessing different reinforcement bar diameters and spacer distribution, considering realistic element construction and standards, combining theory with practice. The results show that the use of spacers does not guarantee the design cover for some reinforcement bar diameters, as 4.2 and 5.0 mm, and regardless of the spacer distribution configuration assessed, these meshes undergo permanent deformation, thereby damaging the cover and consequently impact structural performance. Meshes of 6.3 and 8.0 mm diameters present deformation within the cover tolerance. Therefore, it is preferable to choose bigger diameters and larger mesh spacing to guarantee the projected cover, contributing to the correct performance of the structures, solving one of the major problems in this type of construction.

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Section: Computational Simulationmentioning

confidence: 99%

Computational and experimental simulation to analyze loss in concrete cover by reinforcement deformation in solid slabs

Maran

Barreto

Molin

et al. 2022

Rev. IBRACON Estrut. Mater.

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“…Traditional research is mainly based on typical RC slabs. By changing the reinforcement ratio [15][16][17][18][19][20][21][22][23][24][25], strength of the concrete [16][17][18], span of the slab [16], thickness of the slab [17,19,20], strength of the reinforcement [18] and scale distance [20,21], the data on the failure form, blast pit, displacement and reflected overpressure of the reinforced concrete slab after the explosion are obtained. The damage degree and anti-explosion performance of the RC slab are evaluated by the bearing angle [18], displacement [22], residual bearing capacity [23] and P-I curve [16,24].…”

Section: Introductionmentioning

confidence: 99%

A Research Investigation into the Impact of Reinforcement Distribution and Blast Distance on the Blast Resilience of Reinforced Concrete Slabs

Wang²,

Liu³

et al. 2023

Materials

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Reinforcement is one of the important factors affecting the anti-blast performance of reinforced concrete (RC) slabs. In order to study the impact of different reinforcement distribution and different blast distances on the anti-blast performance of RC slabs, 16 model tests were carried out for RC slab members with the same reinforcement ratio but different reinforcement distribution and the same proportional blast distance but different blast distances. By comparing the failure patterns of RC slabs and the sensor test data, the impact of reinforcement distribution and blast distance on the dynamic response of RC slabs was analyzed. The results show that, under contact explosion and non-contact explosion, the damage degree of single-layer reinforced slabs is more serious than that of double-layer reinforced slabs. When the scale distance is the same, with the increase of distance, the damage degree of single-layer reinforced slabs and double-layer reinforced slabs increases first and then decreases, and the peak displacement, rebound displacement and residual deformation near the center of the bottom of RC slabs gradually increase. When the blast distance is small, the peak displacement of single-layer reinforced slabs is smaller than that of double-layer reinforced slabs. When the blast distance is large, the peak displacement of double-layer reinforced slabs is smaller than that of single-layer reinforced slabs. No matter how large the blast distance, the rebound peak displacement of the double-layer reinforced slabs is smaller, and the residual displacement is larger. The research in this paper provides a reference for the anti-explosion design, construction and protection of RC slabs.

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Numerical Study on the Behavior of Reinforced Concrete Sandwich Panels (RCSPs) under Blast Load

Abbas,

Ahmad,

Khan

et al. 2024

Iran J Sci Technol Trans Civ Eng

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This paper presents the numerically modelled behavior of reinforced concrete sandwich panels (RCSPs) subjected to blast loads. The RCSPs are made up of expanded polystyrene (EPS) foam core having a spray-on reinforced concrete skins, like a ferrocement overlay, on both sides. The experimental study on RCSPs under blast load was previously conducted by Abbas et al. (2019). The authors investigated the physical damage intensity at different scaled distances by using qualitative fragility curves developed through visual inspection. The study was limited to the specific test plan and there is no quantitative record of the research. Experimental work on RCSPs under blasts requires extensive resources and finances. In order to overcome these limitations, the present study investigates the behavior of RCSPs subjected to blast load by utilizing Abaqus software package. The study aims at developing a numerical simulation through finite element analysis (FEA) which can be extended to other geometries and/or loads, facilitating quantitative research for the future. For simulating explosions in Abaqus, the conventional weapons effects programme (CONWEP) model has been used and the analysis is carried out by manipulating explicit dynamic solver. Damage assessment of RCSPs is done by utilizing concrete damage plasticity model. A satisfactory comparison has been drawn between the results of practical damage assessment and that obtained by the FEA. The numerical study is further extended to an RCSPs' structure which showed satisfactory strength against blast load. It is recommended that RCSPs can be used in buildings as infill walls which provide significant capabilities to absorb and dissipate energy produced by explosions.

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Damage diagram of blast test results for determining reinforced concrete slab response for varying scaled distance, concrete strength and reinforcement ratio

Cited by 5 publications

References 13 publications

Computational and experimental simulation to analyze loss in concrete cover by reinforcement deformation in solid slabs

Computational and experimental simulation to analyze loss in concrete cover by reinforcement deformation in solid slabs

A Research Investigation into the Impact of Reinforcement Distribution and Blast Distance on the Blast Resilience of Reinforced Concrete Slabs

Numerical Study on the Behavior of Reinforced Concrete Sandwich Panels (RCSPs) under Blast Load

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