Thermal creep of hybrid steel columns comprising ultra-high strength steel tubes and stainless steel plates under transient fire conditions

Farmani, Mohammad Amin; Heidarpour, Amin; Woo, Clive

doi:10.1016/j.tws.2023.110540

Cited by 9 publications

(14 citation statements)

References 21 publications

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“…In this section, the numerical model used to simulate the UHSS columns at both room and fire temperatures will be presented. The modelling was performed using Ansys Mechanical APDL 2023 R2, and the results are compared with the numerical and experimental results obtained by Farmani et al [11,12].…”

Section: Methodology and Validationmentioning

confidence: 99%

“…These cross-sections are depicted in Figure 1. Additionally, five thermocouples were used for both cases, as specified by these experimental investigations [11,12], see Figure 2.…”

Section: Loading Elements Under Different Heating Ratesmentioning

confidence: 99%

“…In both cases, the upper plate was fixed, and the force Fz was applied to the moving bottom plate. The boundary conditions are depicted in Figure 3, following the main experimental setup used by Farmani et al [11,12]. To achieve a more realistic simulation of the boundary conditions of the columns, upper and bottom end plates with a thickness of 50 mm were included in the model.…”

Section: Loading Elements Under Different Heating Ratesmentioning

confidence: 99%

“…In both cases, the upper plate was fixed, and the force Fz was applied to the moving bottom plate. The boundary conditions are depicted in Figure 3, following the main experimental setup used by Farmani et al [11,12]. The verification of the fire resistance by testing establishes a failure criterion for the elements under compression.…”

Section: Loading Elements Under Different Heating Ratesmentioning

confidence: 99%

“…To describe the material's behaviour at high temperatures, stress-strain curves were generated using the Ramberg-Osgood model, as referenced in [11,12]. This behaviour can be described by Equation (3) when σ ≤ σ 0.2,T and by Equation (4) when σ 0.2,T < σ ≤ σ u,T , where ε T represents the strain at temperature T, σ is the stress at temperature T, E T denotes the Young's modulus at that temperature T, σ 0.2,T signifies the yield strength (0.2% proof stress), ε t0.2,T corresponds to the strain for σ 0.2,T , E 0.2,T is equivalent to the tangent modulus of σ 0.2,T , n T and n ′ T are the coefficients accounting for nonlinearity effects, and finally, σ u,T Appl.…”

Section: Materials Properties At Elevated Temperaturesmentioning

confidence: 99%

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Fire Resistance of Ultra-High-Strength Steel Columns Using Different Heating Rates

Piloto,

Pereira,

Mottin

2024

Applied Sciences

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Ultra-High-Strength Steel (UHSS) offers several advantages over normal carbon steel, promoting exceptional strength, reducing self-weight, improving fire resistance, enhancing durability, and reducing material consumption. These advantages result in cost savings and sustainable engineering construction. The 3D numerical model is based on Geometrical and Materially Nonlinear Imperfection Analysis (GMNIA) and determines the fire resistance of different cross-section columns. The model is validated with experimental tests, with a maximum relative error of 11%. A parametric analysis is presented, based on 252 simulations, assuming three heating rates, two different cross-sections, two different thicknesses, three lengths, and seven load levels. The fire resistance depends on the heating rate, but the critical temperature is almost equal and independent of the heating rate, if one assumes implicit creep in the constitutive material model. The fire resistance decreases with the load level, as expected. The thickness effect of the hollow section is almost negligible in the fire resistance of UHSS columns. The fire resistance decreases more in higher load levels for slender columns. Columns with Circular Hollow Sections (CHSs) generally show higher fire resistance than hybrid columns in longer columns, but the hybrid columns are subject to much higher loads. New design formulas are presented for the critical temperature of UHSS columns, depending on the load level and slenderness of two different cross-sections.

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Section: Methodology and Validationmentioning

confidence: 99%

“…These cross-sections are depicted in Figure 1. Additionally, five thermocouples were used for both cases, as specified by these experimental investigations [11,12], see Figure 2.…”

Section: Loading Elements Under Different Heating Ratesmentioning

confidence: 99%

Section: Loading Elements Under Different Heating Ratesmentioning

confidence: 99%

“…In both cases, the upper plate was fixed, and the force Fz was applied to the moving bottom plate. The boundary conditions are depicted in Figure 3, following the main experimental setup used by Farmani et al [11,12]. The verification of the fire resistance by testing establishes a failure criterion for the elements under compression.…”

Section: Loading Elements Under Different Heating Ratesmentioning

confidence: 99%

Section: Materials Properties At Elevated Temperaturesmentioning

confidence: 99%

See 3 more Smart Citations