Numerical evaluation of blast resistance of RC slab strengthened with AFRP

Kong, Xiangqing; Qi, Xuejian; Gu, Yihan; Lawan, Isah Abba; Qu, Yandong

doi:10.1016/j.conbuildmat.2018.05.081

Cited by 48 publications

(22 citation statements)

References 22 publications

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“…• Aramid fiber reinforced plastics (AFRP) [5] • Fiber reinforced polymers (FRP) [6] • Ultra-high performance fiber reinforced concrete [7] • Glass fiber reinforced polymers [8] • Carbon fiber reinforced polymers [9] • Polyurethane elastomers [10] • Steel jacketing [11] • Strain hardening cementations composites [12] • Steel plates [13] • Glass curtain walls [14] • FRP composites [19] • Use of GFRP [21] • Use of steel jackets and strips [22,23]…”

Section: Techniques Being Used For Strengthening/retrofitting Of Strumentioning

confidence: 99%

“…To cater to the effects of blast loading on structures, different protective/retrofitting techniques have been identified. Previous studies have shown that aramid fiber reinforced plastics (AFRP) [5], fiber reinforced polymers (FRP) [6], ultra-high performance fiber reinforced concrete [7], glass fiber reinforced polymers (GFRP) [8], carbon fiber reinforced polymers [9], polyurethane elastomers [10], steel jacketing [11], strain hardening cementations composites [12], steel plates [13], glass curtain walls [14] and RCC wall panels [15] are the available strengthening/retrofitting techniques used against blast loading.Numerical evaluations of the blast resistance of RCC slabs strengthened with aramid fiber reinforced plastics showed that the strength of the AFRP slab is 20% more than GFRP and the damage of the AFRP strengthened slab is also lower than GFRP [5]. Studies on the behavior of ultra-high performance fiber reinforced concrete (UHPFRC) and HSRC columns subjected to blast loading conclude that the post blast crack patterns, permanent deflections and different levels of damage of UHPFRC columns show superior blast loading resistance as compared to HSRC columns.…”

mentioning

confidence: 99%

“…Numerical evaluations of the blast resistance of RCC slabs strengthened with aramid fiber reinforced plastics showed that the strength of the AFRP slab is 20% more than GFRP and the damage of the AFRP strengthened slab is also lower than GFRP [5]. Studies on the behavior of ultra-high performance fiber reinforced concrete (UHPFRC) and HSRC columns subjected to blast loading conclude that the post blast crack patterns, permanent deflections and different levels of damage of UHPFRC columns show superior blast loading resistance as compared to HSRC columns.…”

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confidence: 99%

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Blast Loading Response of Reinforced Concrete Panels Externally Reinforced with Steel Strips

Khan¹,

Farooq²,

Usman³

2019

Infrastructures

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Frequent terrorist activities, the use of vehicle bomb blasts and improvised explosive devices (IEDs) have brought forth the task of protection against blasts as a priority issue for engineers. Terrorists mostly target the areas where human and economic losses are significantly higher. It is really challenging to study the effects of blast loading on structures due to numerous variables. For instance, the type of detonation charge, explosive material, placement of charge and standoff distance, etc., are a few of the variables which make the system more complicated. Reinforced cement concrete (RCC) wall panels are commonly used for protecting important installations and buildings. In this research, the response of RCC wall panels has been investigated due to the blast effect caused by two TNT charge weights of 50 kg and 100 kg. These two charge weights have been selected after a detailed study of terrorist activities in the recent past. For this purpose, an existing arrangement at an important military installation, i.e., NESCOM Hospital Islamabad in Pakistan, has been selected. To reduce computational efforts, three RCC wall panels, placed side by side producing a continuous front along with a corresponding boundary and structural wall, have been considered. RCC wall panels are placed at a distance of 3 ft from the perimeter of the boundary wall and 23 ft from the structural wall. The displacement on the front face of RCC wall panels and the structural wall is measured at three levels of top, middle and bottom. ANSYS AUTODYN software has been used to simulate the model. Analysis has been carried out to identify and study the weakness of existing arrangements. Literature was reviewed for suggesting an appropriate strengthening technique for existing structures against blast loading. It was found that in addition to existing strengthening techniques, use of steel strips is amongst the most feasible technique for strengthening existing structures. It not only significantly enhanced the blast performance of structures, but it also significantly reduced z-direction displacements and pressures. The results show that the use of steel strips as the improvement technique for already placed RCC wall panels can be effective against a blast loading of up to 100 kg TNT.

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Section: Techniques Being Used For Strengthening/retrofitting Of Strumentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Blast Loading Response of Reinforced Concrete Panels Externally Reinforced with Steel Strips

Khan¹,

Farooq²,

Usman³

2019

Infrastructures

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“…The key elements of any critical infrastructure facilities like columns, external wall should be strengthen to resist such special loads. Steel jacketing [1], Aramid Fiber Reinforced Plastic (AFRP) [2] Hybrid Carbon Fiber Reinforced Polymer -Polyurea (CFRP-UP) [3], Carbon Fiber Reinforced Polymer (CFRP) [4], Fiber Reinforced Polymer wrapping (FRP) [5] etc. are strengthening alternatives to increase blast resistance capacity of the structure.…”

Section: Introductionmentioning

confidence: 99%

Transient Response of RC Panel Protected with Slurry Infiltrated Micro Reinforced Concrete Jacket Under Blast Loading

Shukla¹,

Desai²,

Modhera³

2019

IJRTE

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Abstract: With increase in terrorist attacks, there are definite priority to protect the important infrastructure facilities against possible terrorist attacks. In order to improve blast resistance capacity of RCC panel, in present study, it was strengthened with Slurry Infiltrated Micro Reinforced Concrete (SIMRC) jacket. . The SIMRC jacket strengthened RC panel was analyzed under blast load scenario using finite element method based application, ABAQUS. The dynamic behavior of concrete and grout of SIMRC was modeled using concrete damaged plasticity model. The structural response of RC panel without any strengthening was compared with SIMRC strengthened RC panel to investigate effectiveness of SIMRC jacketing to resist blast load. Parametric study was carried out considering SIMRC jacket on single side or both side of RC panel, with different ratio of thickness of jacket to thickness of RC panel (t/D) and different percentage of wire mesh reinforcement for jacket. Simulation of various analysis results were presented in form of displacement time history, distribution of tensile/compressive damage variable explaining the pattern of failure in the RC panel, comparison of distribution of tensile damage variable on front and back jacket, compression damage variable of RC panel. It was observed that for panels with strengthening displacement and damaged areas are reduced as compared to conventional RC panel. The increase in thickness ratio (t/D), percentage of wire mesh reinforcement in jacket also contribute to increase blast resistance capacity of SIMRC Jacket. It was also observed that the jacketing on both side of RC panel is more effective in reducing the displacement and the damage is observed to be spread over the support areas.Obtained results through present study demonstrate the effective use of SIMRC jacketing as blast mitigation measure. Index Terms: blast load, concrete damaged plasticity model, numerical simulation, Slurry

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“…Tai et al (2011) examined the influence of the reinforcement ratio on the deflection and damage pattern of concrete slabs subjected to explosions of various charge weights. The dynamic response including the deflection and damages induced in RC-slabs to air explosions have been investigated by Kong et al (2018), Yao et al (2016), Zhao and Chen (2013), Wang et al (2013), and Wei et al (2007). Tham (2005) simulated the response of a RC-slab to the impact of a projectile, and concluded that the damage patterns at both sides of the slab were in good agreement with experimental observations.…”

Section: Introductionmentioning

confidence: 99%

Coupled vs uncoupled analysis of one-way RC-slabs under nearby air explosions

Rasouli

Toopchi‐Nezhad

2018

Int J Adv Struct Eng

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The numerical techniques used for blast analysis of structures are categorized in "coupled" and "uncoupled" analysis methods. In a coupled analysis, the fluid-structure interaction is taken into account. Such analysis, although more accurate, is often complex and time consuming. In an "uncoupled" analysis, the blast loads are estimated by empirical equations and then applied to the structure in a separate analysis. Such an analysis is more cost effective, and of more interest for most practical design applications. The main objective of this study is to assess the efficiency of the empirical graphs prescribed by the UFC Code for uncoupled analysis of structures under the nearby air explosions of scaled distances between 0.4 and 0.7 kg/m 1/3. The main characteristic of such explosions is the highly nonuniform distribution of blast-reflected pressure on the surface of structure. A method has been developed by the authors to address this nonuniform distribution in the uncoupled analysis. To examine the accuracy of analysis, the response values and the pattern of damages introduced on several reinforced concrete slabs under blast loads are compared with the results of a corresponding coupled analysis, and experimental observations. The uncoupled analysis described in this paper can be reasonably employed in the blast analysis and design of many structures.

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Numerical evaluation of blast resistance of RC slab strengthened with AFRP

Cited by 48 publications

References 22 publications

Blast Loading Response of Reinforced Concrete Panels Externally Reinforced with Steel Strips

Blast Loading Response of Reinforced Concrete Panels Externally Reinforced with Steel Strips

Transient Response of RC Panel Protected with Slurry Infiltrated Micro Reinforced Concrete Jacket Under Blast Loading

Coupled vs uncoupled analysis of one-way RC-slabs under nearby air explosions

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