Influence Factors Analysis of RC Beams under Falling Weight Impact Based on HJC Model

Long, Xiaohong; Turgun, Ahmed; Rong, Yonghua; Ma, Yongtao; Luo, Hui

doi:10.1155/2018/4731863

Cited by 8 publications

(6 citation statements)

References 20 publications

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“…The concrete was designed using the JHC constitutive model 20 and the parameters of the vegetal concrete principal structure model are shown in Table 3.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Breaking mechanism and damage evolution rule of abrasive water jet impacting reinforced concrete

Liu

Ling

et al. 2023

Structural Concrete

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As time passes, a significant number of reinforced concrete (RC) constructions will require maintenance and transformation. RC repair and renovation often require localized crushing and removal of the distressed area. Abrasive water jet (AWJ) crushing RC has significant advantages in terms of safety, environmental protection, and quality. However, AWJ works with high specific energy consumption and the effective crushing range of the jets is small, and the key to solving these problems lies in an in‐depth study of the general destructive law and cracking mechanism of RC materials under the action of high‐speed liquid impact. Therefore, this thesis focuses on the above key scientific issues, combining mechanical impact tests, smooth particle hydrodynamics numerical simulation methods and computer tomography scans techniques to carry out systematic research. Through the study, it is found that: The fracture characteristics of RC are mainly reflected in crushing pits and cracks, which will produce macrocracks extending along the reinforcement on the side of RC. AWJ impacting RC is mainly divided into three stages: crater formation, upper concrete fragmentation, and concrete damage development in the reinforcement impact area. During the whole impact process, the shear stress, compressive stress and tensile stress of the reinforcement will change continuously with the increase of the impact time of the AWJ.

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“…The concrete was designed using the JHC constitutive model 20 and the parameters of the vegetal concrete principal structure model are shown in Table 3.…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Breaking mechanism and damage evolution rule of abrasive water jet impacting reinforced concrete

Liu

Ling

et al. 2023

Structural Concrete

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show abstract

“…Long et al 34 divided 18 parameters related to material properties in the HJC model into sensitive parameters and nonsensitive parameters. Nonsensitive parameters use existing data, 35 and then the crushing process consistent with the test is obtained by debugging the sensitive parameters.…”

Section: Numerical Model and Experimental Referencementioning

confidence: 99%

Vibration Response Analysis of the Tail Beam of Hydraulic Support Impacted by Coal Gangue Particles with Different Shapes

et al. 2022

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The existing research on coal gangue identification based on vibration usually assumes that coal gangue particles are ideal shapes. To understand the vibration response difference in hydraulic support caused by coal and gangue with real shapes, this paper uses a three-dimensional (3D) scanning technology to determine the real shape of coal particles. The process of coal and gangue impacting the tail beam at different angles was simulated in the LS-DYNA software package, and the effects of shape parameters, velocity, and coal strength on the difference in vibration signals caused by the two were analyzed statistically. The conclusions are as follows: the vibrational response of the tail beam is concentrated mainly in the area between the ribs. The regularity of the velocity signal caused by gangue is better than the regularity of the velocity signal caused by coal, and the attenuation speed of the acceleration signal of gangue is slower than the attenuation speed of the acceleration signal of coal. The probability distributions of the velocity and acceleration responses were analyzed statistically, and the results show that the results from coal can be well fitted by a logarithmic normal function, and the standard deviations of velocity and acceleration are 0.05591 and 489.8, respectively. The gangue results are fitted by the gamma function and the Weibull function, and the standard deviations are 0.13531 and 737.9, respectively, showing that the fitting function has the potential to be used as the basis for coal gangue identification. The change in coal strength has little effect on the vibration response of the tail beam. With increasingly falling velocity, the vibration signal intensity of the tail beam increases, but the discrimination between coal and gangue weakens; therefore, measures should be taken to reduce the falling velocity of the rock mass. The research results of this paper can provide a reference for further study of coal gangue identification methods based on vibration.

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“…The HJC model parameters of gangue are shown in Table 2 [33]. Long et al divided the parameters of the HJC model into sensitive parameters and insensitive parameters [34], according to the parameter sensitivity analysis of HJC model in his study, A, B, G, p l , μ l , and f c are determined as sensitivity parameters, When the sensitivity parameters and insensitivity parameters change with the same amplitude (±20%), the influence of sensitivity parameters on the test results is greater than that of insensitivity parameters. Some parameters in this paper refer to citation [35], and then, according to the falling coal test in section 2.3.1, we continuously adjust the parameters used in the numerical simulation in section 2.3.2, and finally obtain the numerical simulation results consistent with the test.…”

Section: Plos Onementioning

confidence: 99%

Analysis of the vibration characteristics of tail beam of the hydraulic support under random coal gangue particle slip conditions

Wan

Wang

et al. 2022

PLoS ONE

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To study the influence of the gangue content of coal gangue particles on the vibration signal of the tail beam under sliding condition, this paper combines three-dimensional(3D) laser scanning technology with the finite element method, establishes a finite element model of the real shape of coal gangue particles and the hydraulic support in top coal caving in LS-DYNA, analyzes the influence of gangue content on some characteristics of the acceleration signal on the tail beam in the time and frequency domains, and then studies the influence of the size and total mass of the rock, and the angle of the tail beam on the characteristics. The following conclusions are obtained: when the coal gangue particles slip on the tail beam, an increase in gangue content significantly improves the effective value of the acceleration signal of the tail beam in the time domain and the average power and average amplitude in the frequency domain. With different sizes, total masses, and tail beam angles, the increase in gangue content always causes an increase in acceleration signal characteristics. In terms of the influence of various factors on the same gangue content, at the same total mass, the larger the rock mass size is, the faster the characteristic value increases with the increase in gangue content. The greater the total mass, the greater the value of the acceleration signal characteristics. A smaller angle between the tail beam and the ground increases the value of each characteristic. The results of this study provide a reference for further research on coal gangue identification based on vibrations.

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Influence Factors Analysis of RC Beams under Falling Weight Impact Based on HJC Model

Cited by 8 publications

References 20 publications

Breaking mechanism and damage evolution rule of abrasive water jet impacting reinforced concrete

Breaking mechanism and damage evolution rule of abrasive water jet impacting reinforced concrete

Vibration Response Analysis of the Tail Beam of Hydraulic Support Impacted by Coal Gangue Particles with Different Shapes

Analysis of the vibration characteristics of tail beam of the hydraulic support under random coal gangue particle slip conditions

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