Stress analysis of concrete and reinforced-concrete slab structures under a high-velocity impact

Белов, Н. Н.; Yugov, N. T.; Kopanitsa, D. G.; Yugov, A. A.

doi:10.1007/s10808-005-0095-4

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…Belov et. al [5] developed a model to evaluate the response of RC structure under high impact conditions. The mathematical simulations were done to analyse the influence of steel on the failure of RC slabs and 3D formulation was done by finite element method.…”

Section: Literature Studymentioning

confidence: 99%

Effects of Beam Members on Performance of Buildings under Seismic Forces

Soni*¹,

Dubey²,

Sangamnerkar³

2019

IJRTE

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The main aim of the paper is to present an analysis to study on non-linear seismic analysis of reinforced concrete (RC) framed buildings as per the provisions of Indian code IS1893-2016 to evaluate the response of the building configurations depending upon the section sizes of the horizontal members; beams and as per variation in its cross-sectional area. The response of buildings has been noted in terms of quantities as the time period of buildings.Indian seismic code IS 1893 has been employed for the design provisions of the seismic analysis and the structures have been evaluated for seismic zone II. The design software STAAD.Pro has been used for the dynamic analysis.The response of the structure under lateral force system, induced due to seismic activities is must be analysed to understand the behaviour of structure under dynamic forces. The paper evaluates the most common but important response factors of the structure which are most important in the design of building. The paper also shows the detailed results of the time period of buildings for various building configuration. The evaluated results have been tabulated and analysed with the help of a comparative study of the obtained data. The work is useful for better understanding of the performance of the reinforced concrete buildings as per the different sizes and sections and stiffness of the beam elements.

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Section: Literature Studymentioning

confidence: 99%

Effects of Beam Members on Performance of Buildings under Seismic Forces

Soni*¹,

Dubey²,

Sangamnerkar³

2019

IJRTE

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“…To make a more accurate prediction of penetration depths of concrete targets is of great importance in the underground defensive project. Penetration is a process with large strain, high strain rate, and high pressure, in which the dynamic responses of both the projectile and target are very complicated [9], especially for concrete targets that exhibit complicated nonlinear behavior under dynamic loadings [10]. In addition, the effects of strain rate and crack propagation on the mechanical properties of concrete have not been clearly described due to its brittle properties, which play important roles in the penetration process.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Entrance Effect of Penetration into Concrete Targets

Yang

Luo

Zhang

et al. 2021

Mathematical Problems in Engineering

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Investigation on penetration into concrete targets is of great importance as concrete is widely used as the fundamental construction material. To achieve a more accurate prediction of penetration depths of concrete targets, a further study was conducted to explore the entrance effect by using AUTODYN hydrocode in this study. The numerical results on both deceleration-time history and depth of penetration of projectiles are in good agreement with experimental data, which demonstrate the feasibility of the numerical model in these conditions. A new target model was established with a predrilled hole around the symmetry axis to simulate the entrance effect of the crater phase on the penetration process. Compared with the regular target, the predrilled target enters the peak of acceleration earlier, leading to the reduction of the depth of penetration. In addition, simulation results indicated that nose shape significantly influenced crater region depth, while the depth was independent of the impact velocity and the target strength. Based on the simulation of entrance effect, a modified formula of penetration depth has been proposed and validated in terms of different nose shapes. The crater region depths obtained from the simulations can improve the accuracy of the predictions of the penetration depths for the penetration of concrete targets.

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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].…”

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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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Stress analysis of concrete and reinforced-concrete slab structures under a high-velocity impact

Cited by 6 publications

References 2 publications

Effects of Beam Members on Performance of Buildings under Seismic Forces

Effects of Beam Members on Performance of Buildings under Seismic Forces

Numerical Study on the Entrance Effect of Penetration into Concrete Targets

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

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