Prediction of the impact force on reinforced concrete beams from a drop weight

Pham, Thong M.; Hao, Hong

doi:10.1177/1369433216649384

Cited by 60 publications

(51 citation statements)

References 45 publications

(67 reference statements)

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“…It can be found that the changes in the impact parameters have an insigni cant e ect on the overall distribution of ξ, which means the proposed method can be well applied to a wide range of these impact parameters. Figure 14 presents the comparison of measured and predicted peak impact force using the method proposed by Pham and Hao [3]. From this gure, it can be observed that the correlation factors of the experimental results and predictions are R 2 0.563 and R 2 0.343 for spherical and at impact noses, which indicates that the predictions of the peak impact force are not as good as that presented in Figure 12.…”

Section: Peak Impact Forcementioning

confidence: 90%

“…Concrete structures have been commonly used as protective ones in order to resist the extreme loads. In the past two decades, the dynamic response of RC elements under impact loading has been the subject of many studies [1][2][3][4][5], devoted to illustrating the impact mechanism. Due to the intense energy released in an extremely short time, the dynamic response and failure mode are different for RC beams under impact and quasistatic loads.…”

Section: Introductionmentioning

confidence: 99%

“…In order to quickly predict the peak impact force of RC beams under drop-weight impact, Pham and Hao [3] proposed an empirical model based on the artificial neural network. In terms of the maximum midspan displacement, Kishi and Mikami [10] and Tachibana et al [2] conducted a series of impact tests on RC beams with different span lengths, cross sections, and longitudinal reinforcements, proposing empirical formulas for the anti-impact design of RC beams following the performance-based design concept.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Peak Response Prediction for RC Beams under Impact Loading

Zhao

Jia

2019

Shock and Vibration

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In this paper, a novel and simple method for predicting the peak response of RC beams subjected to impact loading is proposed. e theoretical basis for calculating the peak impact force originates from the contact law, the principle of conservation of energy, the impulse-momentum theorem, and the wave theory. Additionally, the conventional beam theory, in conjunction with the wellknown layered-section approach, is utilized to obtain the force-deflection relationship of the RC beam. Subsequently, by taking into account the strain rate effect, the maximum midspan deflection of RC beams under impact loading is determined based on the conservation of energy approach. A comparison with 143 impact tests has shown that the proposed method is able to estimate the maximum midspan deflection of RC beams under impact loading with high accuracy. e prediction of the peak impact force is shown to be slightly overestimated, which however can be used in the anti-impact design to preclude the shear failure near the impact point.

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Section: Peak Impact Forcementioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Peak Response Prediction for RC Beams under Impact Loading

Zhao

Jia

2019

Shock and Vibration

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“…The impact force and displacement of RC beams can be predicted by using the common spring-mass models of either single degree of freedom (SDOF) or two DOF [13]. A review of the existing models was presented in the study by Pham and Hao [3]. The two DOF spring-…”

Section: Effect Of Structural Stiffnessmentioning

confidence: 99%

“…The dynamic analysis of the impact process is not required in the current design codes. In reality, the shear force and bending moment of RC beams under impact are significantly different from those under static loads [3][4][5][6][7][8][9]. Upon impact, a stress wave is generated and propagates in the structure.…”

Section: Introductionmentioning

confidence: 99%

Effect of the plastic hinge and boundary conditions on the impact behavior of reinforced concrete beams

Pham

2017

International Journal of Impact Engineering

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123

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This study numerically investigates the effect of the plastic hinge and boundary conditions on the behavior of reinforced concrete (RC) beams under slow-impact-velocity events. Numerical models are developed by using LS-Dyna and verified against experimental results. The effect of different factors including the impact velocity, projectile weight, and concrete strength on the impact behavior of RC beams is examined. The numerical results have shown that the effect of boundary condition is marginal on the impact force but significant on the displacement and damage of relatively long beams. Determining the structural stiffness of a beam in an equivalent single degree of freedom model for predicting the impact load should consider the plastic hinge formation and stationary location. And this model is not necessarily suitable for predicting the peak beam response since it is independent of the boundary conditions when the impact velocity is fast. The negative bending moment of the simplysupported beam occurs with a large magnitude which needs to be taken into account in the design. The residual displacement is more sensitive to the boundary conditions than the peak displacement. Varying concrete strength from 20 MPa to 100 MPa does not noticeably change the impact force and displacement but significantly affects the failure mode of the beam.

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Drop‐weight testing of slender reinforced concrete beams

Madjlessi

Cotsovos

Moatamedi

2021

Structural Concrete

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The work presented herein sets out to investigate experimentally, via drop-weight testing, the behavior of slender reinforced concrete (RC) beam specimens under impact loading. During testing, the behavior of each specimen is established through the combined use of conventional instrumentation and a high-speed video camera. The primary objective of this work is to investigate the reasons that trigger the observed shift in specimen behavior (compared to that established from static tests) with increasing levels of applied loading rate and intensity. Analysis of the test data reveals that during drop-weight testing only a portion of the element span reacts to the applied load (as indicated by the deformation and cracking profiles recorded) which in turn affects the mechanics underlying specimen behavior and therefore, significantly influencing the mode of failure ultimately exhibited.The observed localized response becomes more prominent by increasing the loading rate and intensity of the imposed impact loading. In addition to the above, the strain-rate sensitivity of the material properties of concrete does not appear to have a significant effect on the behavior of the specimens tested. The aforementioned observations appear to be in conflict with current design practice raising questions concerning the effectives of the design solutions produced.

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Prediction of the impact force on reinforced concrete beams from a drop weight

Cited by 60 publications

References 45 publications

Peak Response Prediction for RC Beams under Impact Loading

Peak Response Prediction for RC Beams under Impact Loading

Effect of the plastic hinge and boundary conditions on the impact behavior of reinforced concrete beams

Drop‐weight testing of slender reinforced concrete beams

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