On the dynamics of fire-exposed steel beam under mechanical load

Ndoukouo, A.N.; Nubissie, A.; Woafo, P.

doi:10.1016/j.jcsr.2011.05.009

Cited by 6 publications

(8 citation statements)

References 4 publications

(8 reference statements)

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“…But we have noted that for beta � 10 −1 , we have peak stress σ P XX � 2150 MPa at θ � 600°C and the corresponding time t � 5.9 min as in ref. [23] in which the temperature t � 5.87 min. We have also noted that the decrease in the peak stress values is approximately 67.71% in X or Y direction and 84.02% in Z direction compared with those values at 100°C.…”

Section: Case Of Rock Specimen In Which Failurementioning

confidence: 99%

“…is model can predict the fire resistance of argillite rock compared with those results in other element structures such as wood beam [22], steel beam [23], granite rock [24], and sandstone rock [25], which are most adequate for engineering project in order to perform the safety time and avoid the damage of structure…”

Section: Case Of Rock Materials In Whichmentioning

confidence: 99%

“…At the end, the authors concluded that the prediction of time to the structural failure is necessary for safety consideration. Ndoukouo et al [23] studied the dynamics of fire-exposed steel beam under mechanical load and showed that an increase in the deflection versus time grows, while the bending moment presents a nonmonotonic behavior under a sinusoidal load. In the case of rocks, Mambou et al [24] investigated numerically the mechanical properties of a granite rock specimen subjected to uniaxial loading and fire to analyze the internal stress and strain.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling and Numerical Analysis in 3D of Anisotropic and Nonlinear Mechanical Behavior of Tournemire Argillite under High Temperatures and Dynamic Loading

Marius

Leroy

Nicolas

2020

The Scientific World Journal

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This work proposes a model that takes into account the anisotropy of material with its inhomogeneity and geometrical and material nonlinearities. According to Newton’s second law, the investigations were carried out on the simultaneous effects of mechanical load and thermal treatment on the Tournemire argillite material. The finite difference method was used for the numerical resolution of the problem by the MATLAB 2015a software in order to determine the peak stress and strain of argillite as a function of material nonlinearity and demonstrated the inhomogeneity parameter Ω. The critical temperature from which the material damage was pronounced is 500°C. Indeed, above this temperature, the loss of rigidity of argillite reduced significantly the mechanical performance of this rock. Therefore, after 2.9 min, the stress reduction in X or Y direction was 75.5% with a peak stress value of 2500 MPa, whereas in Z direction, the stress reduction was 74.1% with a peak stress value of 1998 MPa. Meanwhile, knowing that the material inhomogeneity was between 2995 and 3256.010, there was an increase in peak stress of about 75%. However, the influence of the material nonlinearity was almost negligible. Thus, the geometrical nonlinearity allows having the maximal constant strain of about 1.25 in the direction of the applied dynamic mechanical force.

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Section: Case Of Rock Specimen In Which Failurementioning

confidence: 99%

Section: Case Of Rock Materials In Whichmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling and Numerical Analysis in 3D of Anisotropic and Nonlinear Mechanical Behavior of Tournemire Argillite under High Temperatures and Dynamic Loading

Marius

Leroy

Nicolas

2020

The Scientific World Journal

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“…Heidarpour and Bradford [4] developed a novel numerical method to investigate the nonlinear vibration of a restrained steel beam under high temperature, and the finite element model was established by ABAQUS to demonstrate the accuracy of the method proposed. Several references [5][6][7] analysed the dynamic responses of the steel beams under high temperatures and different loads. Mahi et al [8] derived the governing equations of motion by Hamilton's principle and proposed an exact solution to investigate the free vibration of the beams with different boundary conditions in the temperature field.…”

Section: Introductionmentioning

confidence: 99%

Modal Analysis of a Simply Supported Steel Beam with Cracks under Temperature Load

Yan¹,

Chen²,

Yang³

2017

Shock and Vibration

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Based on the transfer matrix method, an analytical method is proposed to conduct the modal analysis of the simply supported steel beam with multiple transverse open cracks under different temperatures. The open cracks are replaced with torsion springs without mass, and local flexibility caused by each crack can be derived; the temperature module is introduced by the mechanical properties variation of the structural material, and the temperature load is caused by the temperature variation, which can be transformed to the axial force on the cross-section. The transfer matrix of the whole beam with the temperature and geometric parameters of cracks can be obtained. According to boundary conditions of the simply supported beam, natural frequencies of the beam can be calculated, which are compared with the finite element results. Results indicate that the analytical method proposed has a high accuracy; the natural frequencies of the simply supported steel beam are mostly affected by the temperature load, which cannot be ignored.

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“…Inspired by the works of Nubissie et al (2011) andNdoukouo et al (2011), we report numerical investigations of mechanical properties of granite rock specimen under combined effects of high temperature and mechanical loading. We choose the granite rock specimen due to the fact that it is largely used in civil engineering, for example, building of railway, road and tunnels.…”

Section: Introductionmentioning

confidence: 99%

Modeling and numerical analysis of granite rock specimen under mechanical loading and fire

Leroy

Ndop

Ndjaka

2015

Journal of Rock Mechanics and Geotechnical Engineering

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a b s t r a c tThe effect of ISO 834 fire on the mechanical properties of granite rock specimen submitted to uniaxial loading is numerically investigated. Based on Newton's second law, the rate-equation model of granite rock specimen under mechanical load and fire is established. The effect of heat treatment on the mechanical performance of granite is analyzed at the center and the ends of specimen. At the free end of granite rock specimen, it is shown that from 20 C to 500 C, the internal stress and internal strain are weak; whereas above 500 C, they start to increase rapidly, announcing the imminent collapse. At the center of specimen, the analysis of the internal stress and internal strain reveals that the fire reduces the mechanical performance of granite significantly. Moreover, it is found that after 3 min of exposure to fire, the mechanical energy necessary to fragment the granite can be reduced up to 80%.

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On the dynamics of fire-exposed steel beam under mechanical load

Cited by 6 publications

References 4 publications

Modeling and Numerical Analysis in 3D of Anisotropic and Nonlinear Mechanical Behavior of Tournemire Argillite under High Temperatures and Dynamic Loading

Modeling and Numerical Analysis in 3D of Anisotropic and Nonlinear Mechanical Behavior of Tournemire Argillite under High Temperatures and Dynamic Loading

Modal Analysis of a Simply Supported Steel Beam with Cracks under Temperature Load

Modeling and numerical analysis of granite rock specimen under mechanical loading and fire

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