S M AnasJamia Millia Islamia · Department of Civil Engineering
S M Anas
B.Tech (Civil), M.Tech (Earthquake Engg.), PhD (Structural Engg.) 🇮🇳 | Special Issue Editor: Computer Modeling in Engineering and Sciences - Tech Science Press
Strength-enhancing Techniques, Damage Evaluation and Structural Performance under Impulsive Loadings (Blast and Impact).
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Introduction
Aspiring Scientist
Education
November 2019 - June 2023
July 2017 - July 2019
August 2012 - August 2016
Publications
Publications (68)
Rising fanaticism and rapid industrialization across the globe make the structures more vulnerable to direct threats generated from accidental and explosion-induced air-blast loads. Unlike the response of the reinforced concrete structure under quasi-static loading, it may respond in a brittle manner with highly localized failure like scabbing, cra...
Reinforced concrete (RC) structures are generally designed to carry quasi-static gravity loads through almost indispensable components namely slab, however, it may be subjected to high intense loads induced from the impact of projectiles generated by the tornado, falling construction equipment, and also from accidental explosions during their const...
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 2500mm free-fall...
Structural members with low-flexural stiffness, such as slabs, are more susceptible to impulsive loadings induced by falling machines/tools during construction and installation, and also from rolling boulders/rocks triggered by wind/earthquake, especially in mountainous areas. The impact resistance of reinforced concrete (RC) slabs supported on two...
Weak political systems and poor governance in certain developing countries are found to have a war-like environment where structures are being targeted by blasts and bombs. Industrial blasts due to frail know-how and mishandlings are also quite common. Recent accidental explosions like that occurred at the Beirut Port, Lebanon (August 2020); ammuni...
Gravity load-carrying members of a structure are often subjected to low-velocity impact during construction and subsequent service life. In contrast to quasi-static situations, dynamic impacts introduce impulsive loading that must be carefully addressed by considering the strain-rate characteristics of materials. The performance of reinforced concr...
Afghanistan, a nation plagued by wars, terrorism, and counter-terrorism, has borne the brunt of these conflicts. The common people of Afghanistan are weary of the continuous cycle of attacks and counter-attacks by warlords. Even places of worship and those who gather there are not spared from these acts of violence. For years, explosive blasts have...
In the wake of recent devastating explosions, like the tragic blast in Lebanon’s Beirut City, there has been a growing recognition of the need for blast-resistant design. Previously, this type of design was mainly reserved for critical infrastructures such as embassies and military facilities. However, the destructive power unleashed by these incid...
Numerous unreinforced masonry (URM) structures worldwide face greater vulnerability to direct threats like earthquakes, wind, impact, or explosions compared to reinforced concrete and steel structures. Given the current worldwide environment characterized by dominance and extremism, the task of safeguarding structures, especially from explosive det...
In the past few decades, there has been a growing public concern regarding the protection of infrastructures against extreme events, specifically explosive detonations. Traditional structural design has predominantly focused on accounting for gravity, seismic, and wind loads as the primary factors to consider. The rise in subversive attacks has led...
Explosions including accidental and manmade too not only cause damage to the structure/building but also inflict severe injuries and loss of human lives around the explosion. Structural damage further aggravates injuries and life loss. Conventional structural design does not include loading from explosion events. Thus few buildings are designed wit...
Recent explosion events throughout the world have drawn attention to the vulnerability of infrastructure to acts of terrorism. Blast-resistant design of structures is treated as a specialised area to which, commonly, structural engineers are not exposed comprehensively, and most of the knowledge about the blast-resistant design of structures remain...
Study of the blast resistance of engineering structures has become significantly important in recent years in light of the increase in global terrorism. Conventional structural design does not include explosion-loading. Thus, few buildings are designed with requisite resistance against such loading. Exceptions to this are buildings in petrochemical...
The design philosophy and methodology of civil engineering structures have been constantly evolving, from the early strength-based to more recent performance-based design and the current intensively researched emerging resilience-based design. Because failure of civil engineering structures often leads to catastrophic consequences, the primary focu...
Reflected shock wave causes severer damage in the form of spallation, crushing, and cratering of structural concrete components under contact explosions than close-range explosions. In this study, the state of research on the performance of the columns under close-in and contact explosions is presented. The Beirut-explosion (August-2020) was an acc...
Explosions are continually occurring in many parts of the world endangering human lives and seriously affecting the health of infrastructures and facilities. Low-rise buildings having a height of fewer than 13 m are load-bearing structures generally made of unreinforced masonry (URM), particularly in semi-urban areas, villages, and war-prone border...
The sugar industry produces a huge quantity of sugar cane bagasse ash in India. Dumping massive quantities of waste in a non-eco-friendly manner is a key concern for developing nations. The main focus of this study is the development of a sustainable geomaterial composite with higher strength capabilities (compressive and flexural). To develop this...
Damage evaluation and performance enhancement of the structures due to ever-rising malicious sporadic explosions, vehicular collisions, aircraft crashing, falling construction equipment, and rock/boulder impact from landslips are of considerable concern and thus generate sufficient interest to structural engineers and researchers. In this study, a...
Special Issue "Spotlight on the Middle East and Central Asia - Materials Science" | Frontiers in Materials (IF: 3.985)
A special issue entitled "Spotlight on the Middle East and Central Asia - Materials Science" has been released online today under the section "Mechanics of Materials" of the Journal "Frontiers in Materials", Frontiers, (IF: 3.985,...
In the present study, finite element (FE) simulations are performed using the high fidelity physics-based finite element program, ABAQUS/CAE on the models of the one-way normal strength concrete slab, reinforced with the High Yield Strength Deformed (HYSD) steel re-bars, subjected to air-blast loading. The FE models are developed and subjected to d...
Accidental explosions and subversive blasts are on rise. The recent devastating Beirut explosion witnesses this fact. Performance of the structures such as bridges in cities and strategic boarder areas is of paramount importance. With this concern the effect of skew angle on the performance of a single span reinforced concrete (RC) bridge deck supp...
A large proportion of India’s residential buildings is of unreinforced masonry (URM) and falls under the category of non-engineered structures. URM walls in the residential buildings, customarily constructed from clay bricks or concrete blocks and cut stones, are found to be braced and therefore able to carry some out-of-plane loads produced by win...
To investigate the blast response of the one-way normal strength concrete slabs reinforced on both sides with the High Yield Strength Deformed (HYSD) steel re-bars under air-blast loading, finite element (FE) simulation models have been developed using the explicit non-linear finite element program, ABAQUS/CAE. FE simulation outcomes are found matc...
Cement concrete is the material, construction industries using it most all over the world in spite of its inherent weakness to carry tension which is supplemented by the reinforcing bars added to it. All kind of gravity loads such as gradually, suddenly acting, or impacting are carried by the slabs of a structure. But the slab is generally designed...
The present study focuses on how best can we enhance the blast resistance of reinforced concrete (RC) columns of an existing building. For this purpose, an RC column, 300mm x 300mm x 3000mm, carrying an axial compression of 950kN subjected to the 82kg-TNT explosive loading is first analyzed using the ABAQUS software. Strain rate effect on the concr...
Experimentally tested an unreinforced braced clay brick masonry wall by Badshah et al. (2021) under 4.34 and 7.49kg-TNT explosion loads at scaled distances respectively 2.19 and 1.83m/kg1/3 is micro modeled in ABAQUS/Explicit code and analyzed considering Concrete Damage Plasticity (CDP) model with loading rate effects. Wall performance obtained fr...
Compression members in a building structural system called columns are the most important elements since they support other structural elements. Columns of many building structures with stilt floors for parking are exposed and therefore vulnerable to blast loading. Damage to the columns may be hazardous to the structure and its users. Such loadings...
In this paper, available experimental studies on clay-brick and concrete block URM walls subjected to blast loading are briefly reviewed and summarised. Studies conducted to improve the blast resistance of the walls using G-FRP strips, G-FRP rods, and Polyurea coating, and their effect on maximum deflection, damage, and cracking have also been reca...
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 most important for the stability and safety of the buildings under accidental explosions and subversive blasts events, and therefore attrac...
Blasts and accidental explosions are being reported more frequently than before with grievous injuries and loss of lives and damage to the structure, increasing the concern of disaster management authority officials. Structural engineers apprehend that such events may trigger progressive structural collapse leading to movable and immovable property...
Reinforced concrete (RC) blast shelters are of momentous importance during warfare. On-the-ground shelters are also used to store chemical explosives, ammunition, and artillery. Functional requirements of blast shelters are entirely different from ordinary residential/commercial or institutional structures and therefore very rich specifications are...
The possibility of acting impulsive loads such as blast and impact on gravity load-carrying structural members such as slabs during their construction and service life cannot be ruled out. Studies on the response of RC slabs under impact loading are available in the literature. However, the role of the shear reinforcements in the slab under impact...
In this research work, dynamic nonlinear incremental finite element analysis is conducted in ABAQUS software with an inbuilt explicit module to study the impact response of a two-way singly reinforced concrete slab, 1000 mm × 1000 mm × 75 mm, with different flexural tension steel reinforcement orientation layouts subjected to low-velocity falling-w...
Steel bridges are preferred for their lesser construction time and are used in territorial border areas, to
develop road connectivity between neighboring countries, and also in the existing busy railway tracks
to construct underpass and roads over bridges. Bridges are also quite commonly enquired in the
Indian railway network for the railway tracks...
Reinforced concrete (RC) slab is an indispensable component of all kinds of structures to carry gravity loads in general. Quite often than not, the slabs are subjected to impact loads from accidental mishaps, falling construction equipment, and falling boulders and rocks which are not considered in the structural design. Design codes of practice fo...
In a structural system, the load-bearing columns are one of the most important and vulnerable structural members. The destruction of columns may lead to partial failure or even catastrophic progressive collapse of the structure, resulting in tremendous casualties and significant economic loss, as exemplified by the accidental detonation of 2,750 to...
Brick masonry is being replaced by other lightweight compatible materials in the walls, however, it is still being used. Almost all the old structures comprise of load-bearing as well as partition walls are of brick masonry. The blast response of such masonry elements is not well studied and understood. Unreinforced masonry (URM) walls usually perf...
Failure of building structures by blast-induced loading is quite common and is of considerable interest. Consequences of blast loading may result in the progressive collapse of the buildings and as noticed by a number of researchers, some elements of reinforced concrete structures subjected to such extreme loading of short duration may not respond...
Occurrence of extreme loadings on the structure caused by man-made or accidental explosions is not uncommon. Such loadings jeopardize the safety/stability of structure if the key load-carrying member(s) are damaged. Strengthening of compression members of the buildings which is more vulnerable to blast loading may be required, and therefore, is of...
Composite structural members such as concrete-filled double-skin steel tube (CFDSST) and concrete-filled double steel tubular (CFDST) columns are increasingly being utilized in modern structures owing to their capability to integrate the beneficial properties of constituent materials to carry heavy loads as compared to conventional reinforced concr...
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 buil...
Being voluminous and moderately strong in compression, walls of unreinforced masonry (URM) with poor tensile strength possess adequate stabilizing gravity force against destabilizing lateral loads but nevertheless, their flexural and torsional resistances are found to be quite limited. Explosion-induced impulsive loading may destabilize such walls...
From the safety of the structure and security point of view, the role of free-standing compound wall is still relevant. Such unreinforced walls have limited flexural capacity under the effects of blast shockwaves and may suffer from severe damage with catastrophic out-of-plane failure consequences. The previous novel study was conducted by the auth...
Damage evaluation and performance enhancement of the structures due to ever-rising malicious sporadic explosions, accidental detonations, vehicular collisions, aircraft crashing, falling construction equipment, and rock/boulder impact from landslips are of considerable concern and thus generate sufficient interest to structural engineers and resear...
Accidental detonations, and explosions made by extremists are major threats to human life and building structures. The vulnerability of the load-bearing masonry structures is more as compared to the reinforced concrete structures against explosion-induced loadings. Such events weaken the socio-economic stability and therefore necessitates the evalu...
Very recently a new variant of reinforced concrete (RC) columns confined with a double layer of transverse steel has been introduced by researchers and investigated its performance under axial compression and seismic loading. Analysis of blast performance of such columns is of considerable interest. Most of the columns in a building structure are f...
Accidental explosions and subversive blasts are on rise. The recent devastating Beirut explosion witnesses this fact. Performance of the structures such as bridges in cities and strategic boarder areas is of paramount importance. With this concern the effect of skew angle on the performance of a single span reinforced concrete (RC) bridge deck supp...
A finite element model is developed in ABAQUS/CAE to simulate the dynamic response of the reinforced concrete (RC) beam under close-in air-blast loading. The model is subjected to different blast pressures at different scaled distances in free air. The values of the blast pressure have been taken from the blast tests conducted on four RC beams of s...
Political rivalry among aspiring groups for power to rule turns the society hostile with trust deficit tends to instability and poor governance. Disgruntled groups take subversion as a tool to show their worth, and target government building infrastructures using explosives. Accidental explosions too damage the structures. Recent Beirut explosion o...
Recent explosion of the stored ammonium nitrate at Beirut port was of devastating nature caused serious damage to the structures to the extent of the collapse of even single-story dwelling houses. This disastrous explosion led to a large number of deaths (≈200) in addition to grievous injuries, and many more. To replicate the effect of devastating...
Safety of the public transportation infrastructure, especially bridges, against explosive-induced detonation is of serious concern for the civic life in the megacities, and their failure may cause severe social and economic consequences. The current state-of-the-art of design practices for the bridge structures do not take into consideration the ai...
In recent years, structural engineers and designers are showing their concern about the increasing occurrence of accidental explosions and subversive blasts. Such events induce impulsive loads of abnormal intensity on adjoining buildings leading to the failure of their load-bearing components which may result even in their progressive collapse. Civ...
Catastrophic failure of the RCC slab under explosive-induced blast loading could be disastrous for other elements in the structure. In the present work, a finite element model of one-way-reinforced cement concrete slab tested under blast loading for which experimental results/observations are available in the literature has been developed with resp...
A finite element model is developed in ABAQUS/CAE to simulate the dynamic response of the reinforced concrete (RC) beam under close-in air-blast loading. The model is subjected to different blast pressures at different scaled distances in free air. The values of the blast pressure have been taken from the blast tests conducted on four RC beams of s...
In the current scenario of insecurity from different sources, the role of the compound wall is more important than ever. In addition to stability, the strength of such walls from the explosion point of view is of considerable interest to the engineers. In this paper, the finite element simulations of 6000 mm × 2500 mm × 350 mm (length × height × th...
The blast-induced impulsive loads due to unabated accidental and man-made explosions on structures are receiving attention from structural designers. Recent devastating Beirut ammonium nitrate explosion and very recent blast at a chemical factory on the outskirts of Bangkok are examples of the accidental explosions. Such loading applies a high-inte...
In the present study, explicit dynamic analysis has been conducted to
investigate the blast response of the masonry heritage building, located in the
southern part of Asia, subjected to peak overpressures generated from the TNT
charges at different standoff distances and locations. The explosive-induced
blast wave pressure-time history has been...
![Fig. 1 a Typical air-blast pressure wave profile [20]; and b estimated...](profile/S-M-Anas/publication/350531918/figure/fig1/AS:1008858206060545@1617541948817/a-Typical-air-blast-pressure-wave-profile-20-and-b-estimated-air-blast-pressure_Q320.jpg)
![Mechanical properties of substituted FRP re-bars [5]](profile/S-M-Anas/publication/350531918/figure/tbl1/AS:1008858206056450@1617541948902/Mechanical-properties-of-substituted-FRP-re-bars-5_Q320.jpg)
Explicit dynamic analysis has been conducted using the ABAQUS/CAE, a finite element program, on one-way normal-reinforced concrete (NRC) slabs. Time-dependent blast pressure, P(t), has been modeled following the empirical relationships from the literature. The values of the incident overpressure have been taken from the blast tests conducted on fou...
A finite element model is developed in ABAQUS/CAE to simulate the behavior of one-way reinforced concrete slabs under air-blast loading. Several published empirical equations have been utilized to model air-blast pressure, P(t), for different combinations of the explosive charges and standoff distances. The values of the peak overpressure have been...
In general, the blast-induced ground shock excites the foundation of the structure prior to the air-blast pressure because of the obvious reasons of difference in wave propagation velocities. However, the ground shock and air-blast pressure might act simultaneously on the structure for some standoff distance with a particular quantity of the explos...
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Excited to share the release of another Special Issue entitled "Recent Advances in Computational Methods for Performance Assessment of Engineering Structures and Materials against Dynamic Loadings" in the SCI-index journal "Computer Modeling in Engineering and Sciences" | Tech Science Press.
Submission Deadline: 20 November 2023
Link for Submission:
Summary
The design philosophy and methodology of civil engineering structures have been constantly evolving, from the early strength-based to more recent performance-based design and the current intensively researched emerging resilience-based design. Because failure of civil engineering structures often leads to catastrophic consequences, the primary focus of all these design methods is the safety of structures while considering other aspects such as performance and resilience. With the economic growth, population increase and urbanization, as well as global warming and the depletion of natural resources, to meet the societal need for sustainable development, the construction of civil engineering structures also needs to consider sustainability, durability and smart lifecycle management besides safety, performance and resilience.
While steel and concrete are still the main structural materials today, several promising new options have emerged as alternative or supplemental materials for structural use. These emerging materials include fiber-rein-forced polymer composites, fiber-reinforced cementitious composites, fabric-reinforced concrete, seawater sea-sand concrete, ultrahigh-performance concrete, ultrahigh-performance steel, and various types of green materials. Although these materials hold great potential for stronger, lighter and more durable structures, their adoption in structural engineering has been slow.
This Special issue covers a wide range of modern trends in the study of the analysis, design, integrity, and safety of engineering structures and materials based on experimental testing, numerical simulations, and analytical/theoretical analyses.
Topics of interests include (but are not limited to):
· Design, integrity, reliability, and safety of engineering structures;
· Damage mechanics;
· Structural performance under extreme loadings;
· Construction materials;
· Condition assessment of civil infrastructure;
· Fatigue reliability assessment of critical structures;
· Quasi-static, earthquake, wind, impact, fire, and blast loadings;
· Advances in reliability and optimization of structural systems;
· Bridge analysis, design, assessment, monitoring and management;
· Vibration Analysis for Civil Engineering Structures;
· Management of Civil Infrastructure;
· Codes and standards;
· Composite structures;
· Artificial Intelligence; Machine-learning
A special issue entitled "Spotlight on the Middle East and Central Asia - Materials Science" has been released online today under the section "Mechanics of Materials" of the Journal "Frontiers in Materials", Frontiers, (IF: 3.985, SCI indexing).
Frontiers in Materials, a multidisciplinary gold open-access journal, is delighted to present the inaugural “Spotlight on the Middle East and Central Asia - Materials Science” article collection.
Through this collection, we aim to showcase the high-quality work of internationally recognized Middle East and Central Asia-based researchers covering all aspects of Frontiers in Materials. The work presented here highlights advances in theory, experiment, and methodology with applications to compelling problems.
All researchers were individually nominated by the Topic Editors in recognition of their achievements and potential to influence the future directions in their respective fields.
This article collection is open for submissions across all specialty sections of Frontiers in Materials, and new articles will be added to this collection as they are published.
Please note that spontaneous submissions will also be considered only with a preliminary submission of an abstract and at least one of the corresponding authors must be based in the Middle East and Central Asia.
Original papers (research articles/review papers/case studies) of a high standard dealing with all aspects of materials research, including modeling, testing, and construction research on material properties, components, assemblages, and connection and structural behaviors, will be considered for publication.
Topic Editors
S. M. Anas
Department of Civil Engineering, Faculty of Engineering and Technology, Jamia Millia Islamia
New Delhi, India
Hadee Mohammed Najm
Department of Civil Engineering
Aligarh Muslim University
Aligarh, India
Shaker Qaidi
Department of Civil Engineering
University of Duhok
Duhok, Iraq
Timeline:
Abstract Submission Deadline 18 March 2023
Manuscript Submission Deadline 16 July 2023
For further information please visit the website
A special issue entitled "Masonry Design and Analysis" has been released online today under the section "Building Structures" of the Journal "Buildings", MDPI Publications, (IF: 3.324, SCI indexing).
This Special Issue aims to discuss innovative materials and methods used for repairing and strengthening masonry structures and investigates their effectiveness using non-destructive methods, structural health monitoring, and advanced experimental and numerical procedures.
Topics of interests include (but are not limited to):
-Innovative retrofitting/strengthening methods and applications;
-Conservation of heritage buildings;
-Theoretical/Numerical modeling of masonry structures;
-Fire, blast, and impact loadings;
-Earthquake loading;
-Codes and standards;
-New developments in the design/verification of strengthening options;
-Composite concrete–masonry structures;
-Progressive collapse, robustness, and performance of masonry-infilled steel/concrete frames under extreme loadings;
-Strategies to enhance redundancy of infilled steel/concrete structures.
Original papers (research articles/review papers/case studies) of a high standard dealing with all aspects of masonry structure research, including modeling, testing, and construction research on material properties, components, assemblages, and connection and structural behaviors, will be considered for publication.
...
S M Anas
(Leading Guest Editor)
Contact:
E-mail: mohdanas43@gmail.com
Secondary e-mail: s1910521@st.jmi.ac.in
.....
Timeline:
- Submission deadline: April 30, 2023
- Acceptance deadline: July 31, 2023
.....
For further information please visit the website
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