Failure of concrete and reinforced-concrete plates under high-speed shock and explosion

Afanas’eva, S. A.; Белов, Н. Н.; Kopanitsa, D. G.; Yugov, N. T.; Yugov, A. A.

doi:10.1134/1.1897986

Dokl. Phys.

2005

DOI: 10.1134/1.1897986

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Failure of concrete and reinforced-concrete plates under high-speed shock and explosion

S. A. Afanas’eva

Н. Н. Белов

D. G. Kopanitsa

et al.

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Cited by 3 publications

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“…The fragmented material in tension is described as a powder which moves according to the equations of a stress-free material [9,10].…”

mentioning

confidence: 99%

Calculation of the strength of reinforced concrete columns under repeated longitudinal impact

Белов

Yugov

Kopanitsa

et al. 2008

J Appl Mech Tech Phys

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This paper reports the results of experiments with reinforced concrete column models subjected to repeated longitudinal impact loading using a pile driver. The strength of the column models is analyzed by comparing experimental data with results of mathematical modeling.The collapse of concrete-frame buildings under seismic impacts is characterized by failure of the concrete column body with a loss of stability of the longitudinal reinforcement, i.e., buckling of reinforcement bars in various directions, leading to the collapse of the structure or the entire building. Figure 1 shows the failure of the middle reinforced concrete column of the ground floor of the service center building resulting from the magnitude 7.9 earthquake on October 4, 1994 at the Goryachie Klyuchi village (the Iturup island). One can see the crushed top of the concrete column and the buckling of the main reinforcing bar due to the insufficient transverse reinforcement.Seismic calculations for concrete frame structures can be based on the results obtained for models of individual members. It should be taken into account that, during seismic impacts, the frame members are subjected to multiple shock loading. In the present work, the failure of models of concrete and reinforced concrete columns under longitudinal impact was analyzed using computational and experimental methods. The experimental studies of repeated shock loading were performed on a pile driver. Mathematical modeling, combined with the laboratory experiments, provided a more complete analysis and valid physical interpretation of test results.A mathematical model for calculating deformation and failure in porous high-strength ceramics under highvelocity impact and explosion conditions is proposed in [1,2]. Failure is treated as the formation, growth, and coalescence of microdefects under the action of stresses during loading. The model proposed in [2-4] has been used in failure calculations of brittle materials under multiple shock loading aimed at studying the particle crushing mechanisms in producing submicron-size powders of high-melting compounds in a pneumatic circulating device. In [5], this model was employed to calculate the dynamic strength of concrete.1. Experimental Studies. Reinforced concrete columns of dimensions 10 × 10 × 100 cm were made of B35 concrete and reinforced by a frame. A-III type longitudinal reinforcement of diameter 10 mm and Bp-I type transverse reinforcement of diameter 5 mm with a step 15 cm were used. The structures were installed vertically on a steel platform. The drop weight acted on the top surface through a steel distributing sheet 2 cm thick. In the experiments, the mass of the drop weight was varied from 225 to 500 kg. The weight drop height was varied from 35 to 70 cm. The measuring system was located inside a steel plate which was placed on the column head and impacted by the weight. The measurements were made by a 32-channel receiving-measuring complex in real time. The time-and-frequency parameters of the columns were determined on a p...

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“…The fragmented material in tension is described as a powder which moves according to the equations of a stress-free material [9,10].…”

mentioning

confidence: 99%

Calculation of the strength of reinforced concrete columns under repeated longitudinal impact

Белов

Yugov

Kopanitsa

et al. 2008

J Appl Mech Tech Phys

Self Cite

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“…The problem of the impact of steel cylindrical projectiles on rectangular slabs made of reinforced concrete is solved. The results of mathematical modeling are in good agreement with experimental data.The problem of impact interaction of cylindrical projectiles with rectangular concrete and reinforced-concrete slabs was solved in [1][2][3]. Concrete fracture was calculated by a phenomenological approach where the strength criteria are expressed in terms of invariant relations between the critical values of macrocharacteristics of the process (stresses and strains).…”

mentioning

confidence: 99%

Analysis of reinforced-concrete strength under impact loading

Белов

Kabantsev

Konyaev

et al. 2006

J Appl Mech Tech Phys

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A mathematical model is proposed to describe deformation and fracture of reinforced concrete under impact loading within the framework of mechanics of continuous media. The problem of the impact of steel cylindrical projectiles on rectangular slabs made of reinforced concrete is solved. The results of mathematical modeling are in good agreement with experimental data.The problem of impact interaction of cylindrical projectiles with rectangular concrete and reinforced-concrete slabs was solved in [1][2][3]. Concrete fracture was calculated by a phenomenological approach where the strength criteria are expressed in terms of invariant relations between the critical values of macrocharacteristics of the process (stresses and strains). Until the failure criterion is reached, the concrete behavior under dynamic loading is described by the model of a linear elastic body possessing physical and mechanical properties of concrete. As the failure criterion is satisfied, the material is assumed to be damaged by cracks. Fragmentation of the damaged material is described within the framework of the model of a porous elastoplastic medium. Fragmentation of the crack-damaged material subjected to tensile stresses occurs when the relative volume of voids reaches a critical value. If the crack-damaged material is subjected to compressive stresses, the local criterion of fragmentation is either the limiting value of the work of plastic strains or the limiting value of intensity of plastic strains, which is uniquely related to the first factor. The fractured material behaves as a granulated medium that can withstand compressive and shear stresses but fails under the action of tensile stresses. The results of mathematical modeling of impact interaction of steel cylindrical elements with concrete slabs compared with experimental data showed that this approach can be used to calculate the strength of elements of reinforced-concrete structures under dynamic loading.In calculating reinforced-concrete structures, the concrete layer with reinforcing bars is modeled by an elastoplastic medium, which is a homogeneous two-phase mixture of steel and concrete. In contrast to concrete whose typical feature is brittle fracture, the fracture of the homogeneous two-phase mixture of steel and concrete is rather similar to that of plastic materials [4].A mathematical model that allows calculating deformation and fracture of high-strength porous ceramics under explosive and impact loading within the framework of mechanics of continuous media was developed in [5][6][7]. An advantage of this model is the possibility of studying the fracture in porous ceramics under multiple impact loading. This mathematical model was used in [8] to study the mechanisms of particle refinement for obtaining submicron powders in a pneumatic circular machine. This model can be readily adapted to calculating the strength of foam concrete under dynamic loading.

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Strength of a Reinforced-Concrete Commercial Object on High-Velocity Impact with a Model Projectile

Белов

Yugov

Afanas’eva

et al. 2014

J Eng Phys Thermophy

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Failure of concrete and reinforced-concrete plates under high-speed shock and explosion

Cited by 3 publications

References 0 publications

Calculation of the strength of reinforced concrete columns under repeated longitudinal impact

Calculation of the strength of reinforced concrete columns under repeated longitudinal impact

Analysis of reinforced-concrete strength under impact loading

Strength of a Reinforced-Concrete Commercial Object on High-Velocity Impact with a Model Projectile

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