Damage response of conventionally reinforced two-way spanning concrete slab under eccentric impacting drop weight loading

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

doi:10.1016/j.dt.2022.04.011

Cited by 67 publications

(60 citation statements)

References 49 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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“…Slabs is one of the most widely used structural element as it forms the floors and roofs in order to support loads normal to the surface floor. The slabs can be simply supported or even continuously span over more than one supports [6,9,21]. Rectangular slabs that are supported only on two sides opposite of each other by walls or beams where the loads are uniformly distributed along the direction that is parallel to the supports [22,14].…”

Section: Introductionmentioning

confidence: 99%

“…Rectangular slabs that are supported only on two sides opposite of each other by walls or beams where the loads are uniformly distributed along the direction that is parallel to the supports [22,14]. If the slab is square and is restrained similarly on all four sides, the load is distributed equally in both directions [6,14]. There are two types of two-way solid slabs which are simply supported slab and restrained slab.…”

Section: Introductionmentioning

confidence: 99%

Computer Programming for Analysis and Design of Edge Supported Rectangular Two-Way Solid Slab by Es En 1992-1-1:2015

Chawaka¹

2022

Preprint

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This study’s main target was to analyze and design rectangular edges supported in two ways 1 solid slabs by using ES EN 1992-1-1:2015. Slab design is often carried out either manually or with 2 the use of design and analytic software. The researcher sees that some software cannot accept some 3 countries’ standard codes. For example, currently in Ethiopia analysis and design of two-way solid 4 the slab is done using a readily available Excel sheet template. But working with this might have many 5 problems, firstly the structure that is already analyzed by SAP or SAFE or any other international 6 a software application that uses international codes but which cannot design structure using ES EN 7 1992; for instant euro codes and designed by excel sheet can create failure and uneconomical analysis 8 and design result. In this paper, the slab is designed and analyzed based on the chosen concrete grade, 9 chosen reinforcement bar diameter, chosen steel grade for design and analysis of slabs calculations 10 like load, moment, shear, and deflection checking using the moment coefficient method for analysis 11 and design and Microsoft Visual Basic 2010 for coding. All input values are given by the International 12 Standard units are also used to represent output values. Using manual calculations delays time 13 and mostly the result is not correct. But using this Computer program can increase computation 14 accuracy and save time. The procedure the researcher followed is, first the manual calculation has 15 been done and then SADSE2021 has been done. The result is that both are 99.9 percent identical, and 16 the disadvantage of this method is that it cannot be used to determine the detailed drawing.

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“…2022;Anas et al, 2022J;Anas et al, 2022K;Anas et al, 2022L;Anas et al, 2022M;Anas et al, 2022N;Anas et al, 2022O;Shariq et al, 2022b; Shariq et al, 2022c;Anas and Alam, 2022d). This, however, tends to be a very laborious process.…”

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confidence: 99%

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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Damage response of conventionally reinforced two-way spanning concrete slab under eccentric impacting drop weight loading

Cited by 67 publications

References 49 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

Computer Programming for Analysis and Design of Edge Supported Rectangular Two-Way Solid Slab by Es En 1992-1-1:2015

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

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