Damage assessment of RC columns under the combined effects of contact explosion and axial loads by experimental and numerical investigations

Mejía, Nestor; Peralta, Ricardo J.; Tapia, Rodrigo; Durán, Ricardo G.; Sarango, Andrés

doi:10.1016/j.engstruct.2021.113776

Cited by 20 publications

(1 citation statement)

References 20 publications

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“…CSC (Continuous Surface Cap) [10], HJC (Johnson-Holmquist Concrete) [16], K&C (Karagozian and Case Concrete) [17], and the RHT model are widely used in the simulation of reinforced concrete explosion damage. The RHT material model [18] was first proposed in 1999 and applied well to the response of concrete under explosive loads [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Damage Zone of the Reinforced Concrete Beam under Rectangular Explosive Contact Explosions

et al. 2023

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This paper investigates the damaged area of a reinforced concrete beam under rectangular explosive contact explosion, through full-scale beam tests and numerical simulation. The calculation equation of beam surface load distribution based on equivalent impulse is established, with a consideration of the effect of the length and height of rectangular explosive on the load distribution, and the calculation equation of beam damage area is further proposed. Through changing the mass of the rectangular TNT explosive (1~6 kg) and the shape of the 1 kg rectangular explosive, 5 cases of the test were carried out on a full-scale reinforced concrete beam. The damaged area of the beam is divided into three parts: blasting crater, damage span of the front face, and damage span of the bottom face. The RHT (Riedel–Hiermaier–Thoma) material model is used to simulate concrete for numerical simulation. Curve fitting was performed based on the numerical simulation results. With the prediction of the load distribution on the beam surface, the size of the surface crushing area and the span of the damaged area are calculated; the section resistance function of the beam is introduced to calculate the depth of the blasting crater; and the correlation curve between the damaged span of the front face, the depth of the blasting crater, and the mass of the block TNT is established. The local damage to the beam under the contact explosion load can be evaluated more accurately when the mass of the rectangular TNT is 1~6 kg.

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Section: Introductionmentioning

confidence: 99%

Damage Zone of the Reinforced Concrete Beam under Rectangular Explosive Contact Explosions

et al. 2023

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Numerical analysis of the local damage of RC beams under close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model

Xu,

Liu,

Huang

et al. 2024

Structural Concrete

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Limited research has been carried out to investigate the local damage features of reinforced concrete (RC) beams under close‐in explosions. To better capture the local damage features of rectangular cross‐sectional RC beams, a numerical study on the RC beams subjected to close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model was conducted in LSDYNA. First, a systematic calibration of the K&C model for concrete was performed in the single‐element numerical analysis. Calibration of the K&C model consists of parameter determination for the new strength surfaces, modification of the damage function to better feature the tensile behavior of concrete, elimination of the element size effect by introducing an element size factor and determination of the scaled damage factors. The new strength surfaces are verified and determined through both the approximation calculation method and the parameter fitting method. And the damage function was modified by reducing the termination of λ to better characterize the brittleness of concrete and feature the tensile failure. A comparison between the numerical results and the corresponding experimental results demonstrates that the calibrated K&C model and established FEM model of RC beams subjected to close‐in explosions can well characterize the local damage features of RC beams. On this basis, a further parameter analysis on the factors influencing the local damage response of RC beams was conducted by considering reinforcement details (stirrup spacing and longitudinal reinforcement diameter) and charge details (charge mass and aspect ratio). Results show that the close‐in explosions destroyed the concrete corners in the blast surface with shear stress first and the side shear failure of concrete corners weakens the concrete core strength and contributes to the greater loss of concrete core. Rear spalling damage was initially caused by the bond failure between the tensile longitudinal reinforcement and the surrounding concrete. Furthermore, increasing stirrup spacing, tensile longitudinal reinforcement diameter, and charge mass contribute to the increase in local damage sizes.

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Wu,

Cheng,

2024

Springer Tracts in Civil Engineering

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Damage assessment of RC columns under the combined effects of contact explosion and axial loads by experimental and numerical investigations

Cited by 20 publications

References 20 publications

Damage Zone of the Reinforced Concrete Beam under Rectangular Explosive Contact Explosions

Damage Zone of the Reinforced Concrete Beam under Rectangular Explosive Contact Explosions

Numerical analysis of the local damage of RC beams under close‐in explosions based on the calibrated Karagozian & Case (K&C) concrete model

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