Numerical simulation on dynamic behavior of reinforced concrete beam with initial cracks subjected to air blast loading

Qu, Yandong; Li, Xin; Kong, Xiangqing; Zhang, Wenjiao; Wang, Xuezhi

doi:10.1016/j.engstruct.2016.09.032

Cited by 60 publications

(19 citation statements)

References 41 publications

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“…Qu et al [30] examined performance of samples made of UHPFRC columns under distinct explosive loadings at a standoff distance of 1.5 m. Blast tests were conducted on high strength reinforced concrete (HSRC) compression column with a similar size and reinforcement as in UHPFRC columns to investigate the behavior having identical loading conditions. The post-blast crack pattern, deflections, and different dimensions of damage demonstrated that UHPFRC compression elements exhibited better performance under blast loading when compared with HSRC compression elements.…”

Section: Standoff Distancementioning

confidence: 99%

“…They proposed that the static preloading may be limited to keep away from collapse for blast resistant design of single-layer reticulated domes. Qu et al [30] focused on locations, charge weights, depth of initial cracks and width, and places of explosive charges, in addition to reinforcement proportions on the dynamic behavior of RC beams having cracks under air blast loading. The simulated results demonstrate comparison between beams with RC beam in terms of increase of maximum deflection, velocity at node at mid-span, stresses of concrete in compressive zone, etc.…”

Section: Types Of Blast Loadingmentioning

confidence: 99%

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Influence of critical parameters on UHPFRC structural elements subjected to blast loading

Rizwanullah

Sharma

2020

SN Appl. Sci.

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Response of structures subjected to blast loading is a highly complex phenomena involving time-dependent deformation, geometric and material nonlinearities and loading rate based material properties. During an explosion, blast loads act as an impulsive load of very short duration developing enormous heat and pressure. With increasing terrorist threats, attention is needed to study dynamic response of structures under blast loading. Ultra high strength concrete (UHPC) has been found to considerably enhance strength, member size, weight reduction and workability and is now a day used due to improved energy absorption capacity, workability and anti-abrasion ability. Investigations conducted by several researchers to study blast-resistant capacities of UHPC have demonstrated possibilities of using the material in structures susceptible to terrorist attack. The present paper provides comprehensive review of published research to study blast loading effect on Ultra high performance fibre reinforced concrete (UHPFRC) structural elements in terms of variables like standoff distance, charge weight, types of blast loadings, grades of UHPFRCs, etc., both analytically and experimentally. UHPFRC slab panels, beams, columns, and other fibre composite structures have been studied at structural level to draw fruitful inferences and conclusions. It has been found that UHPFRC possesses increased capacity to disseminate large amount of energy during blast loading and demonstrates better performance after blast damage contrasted with normal strength concrete and High strength concrete. Detailing in UHPFRC structural elements under seismic condition offers improved blast performance, and UHPFRC can more effectively resist compression and shock waves. Low Strength and low ductility fibres added to UHPFRC further illustrates minimal influence on the blast performance and fracture energy. Shear failure is also found to be one of the dominant modes in UHPFRC under blast loading at close standoff. Based on extensive review, further research is proposed to solve complex problems to achieve appropriate design of structural UHPFRC members.

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Section: Standoff Distancementioning

confidence: 99%

Section: Types Of Blast Loadingmentioning

confidence: 99%

Influence of critical parameters on UHPFRC structural elements subjected to blast loading

Rizwanullah

Sharma

2020

SN Appl. Sci.

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“…Considering the convenience of modelling, force checking and short time-consuming, no slip between the steel reinforcement and concrete is assumed. However, in real cases, bond-slip between steel and concrete is exist, and it is found that the perfect bond assumption has fewer influence to the result of RC structures under blast loading [13,22,23]. The Lagrangian formulation in which the coordinates move with the material is applied in the analysis.…”

Section: Finite Element Model Boundary Conditionsmentioning

confidence: 99%

“…Chen and Hao adopted an erosion criterion according to the principle strain of 0.1 to simulate the failure of concrete under blast loading [20]. Some other researchers used different erosion criteria to simulate the spall damage of different concrete materials [23,41,42]. In this study, the erosion criterion is set as 0.1 after intensive simulations which carried out with different erosion criteria, it is found that using principle tensile strain of 0.1 leads to reliable predictions of RC slab responses.…”

Section: Contact Formulation and Erosion Algorithmmentioning

confidence: 99%

Numerical Simulation of Cracked Reinforced Concrete Slabs Subjected to Blast Loading

Zhang¹,

Kong²,

Qu³

et al. 2018

CivileJournal

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Crack is one of the most common defects observed in reinforced concrete (RC) structures. An initial crack will lead to severe changes in the stress state when the structure subjected to blast loadings. Target on acquiring the dynamic data, a finite element method is applied to simulate the response of cracked RC slab subjected to blast loading. The theoretical results of damage distribution and mid-span deflection of normal specimens are first compared with experimental test, which indicates that the dynamic behaviour of RC slab under blast loading can be well predicted by the finite element model. Then blast responses of cracked RC slabs with varied crack parameters (e.g. orientation, width and depth) are systematically studied. Results show that damage of the cracked slab initiates from the initial crack tip of the bottom surface, and then it propagates quickly with cracks found in the support areas on the top surface. In addition, the existence of initial cracks in the RC slab make it subject to more serious damages than the normal RC slab under the same explosive loads, as well as a short reacted failure time. Moreover, variations of crack parameters have slight influences on the distributions of cracked RC slab.

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“…The anti blast performance and damage characteristics of reinforced concrete beams with different stirrups ratios were analyzed by Yao et al . Qu et al (Qu, Li, Kong, & Zhang, 2016) conducted the numerical studies to study influence of weights and position of explosive charges, locations, widths and depth of initial cracks and longitudinal reinforcement ratio on the dynamic behavior of simply supported RC beam with initial cracks.…”

Section: Introductionmentioning

confidence: 99%

Study of Dynamic Response of Wall Panel Subjected to Blast Load

Shukla¹,

Desai²,

Modhera³

Kalpa Publications in Civil Engineering

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Now a days due to increase in the terrorist activities, it becomes necessary to study the response of building when subjected to blast loading. The front wall of the building has direct effect of blast load. In the present study typical reinforced concrete wall panel was consider for dynamic analysis under blast load scenario. The dynamic analysis was carried out using Single Degree of Freedom Blast Effects Design Spreadsheets (SBEDS). The parametric study was carried out to study the effect of compressive strength of concrete, percentage reinforcement, thickness of wall and unsupported length of wall on response of building under blast load scenario. The results were presented in form of displacement time history and pressure impulse diagrams. The results indicate that the displacement of RC wall panel decrease as the increase in the thickness of wall panel, grade of concrete and percentage of reinforcement, but with the increase in unsupported length of RC wall panel, the displacement increases. The mode of failure of RC wall panel under blast load scenario was predicted using pressure impulse diagram. It was observed that as the increase in unsupported length of shear wall, the shear wall was prone to fail in flexural failure mode in impulsive as well as quasi-static region. The results also indicate that as the increase in thickness of wall, percentage reinforcement and compressive strength of concrete, the shear wall was prone to fail in direct shear mode in impulsive region and flexural mode in quasi-static region.

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Numerical simulation on dynamic behavior of reinforced concrete beam with initial cracks subjected to air blast loading

Cited by 60 publications

References 41 publications

Influence of critical parameters on UHPFRC structural elements subjected to blast loading

Influence of critical parameters on UHPFRC structural elements subjected to blast loading

Numerical Simulation of Cracked Reinforced Concrete Slabs Subjected to Blast Loading

Study of Dynamic Response of Wall Panel Subjected to Blast Load

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