Analytical Equations Applied to the Study of Steel Profiles under Fire According to Different Nominal Temperature-Time Curves

Abstract

Some analytical methods are available for temperature evaluation in solid bodies. These methods can be used due to their simplicity and good results. The main goal of this work is to present the temperature calculation in different cross-sections of structural hot-rolled steel profiles (IPE, HEM, L, and UAP) using the lumped capacitance method and the simplified equation from Eurocode 3. The basis of the lumped capacitance method is that the temperature of the solid body is uniform at any given time instant during a heat transient process. The profiles were studied, subjected to the fire action according to the nominal temperature–time curves (standard temperature-time curve ISO 834, external fire curve, and hydrocarbon fire curve). The obtained results allow verifying the agreement between the two methodologies and the influence in the temperature field due to the use of different nominal fire curves. This finding enables us to conclude that the lumped capacitance method is accurate and could be easily applied.

Multiscale homogenization of aluminum honeycomb structures: Thermal analysis with orthotropic representative volume element and finite element method

“…The boundary conditions for heat transfer on the bottom and top surfaces of the panel are determined by convection. The ambient temperature on one side of the panel is determined by the ISO 834 standard temperature-time curve [ 62 ], while the ambient temperature on the other side is kept constant at 22 °C. The temperature curve is represented by Eq.…”

Temperature Distribution Curve Analysis on Concrete through LS-DYNA

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Fire Resistance of Foamed Concrete for Discontinuous Partition Filling

“…As fire is the cause of the reduction in material properties and load-bearing capacity of structures [ 1 ], construction material regulations include fire resistance tests which provide an assessment of load-bearing characteristics and fire separation properties. The tests are performed in large furnaces with reference to a standard temperature–time curve [ 2 ] defined by the equation: where —time [min], and —the gas temperature in the fire compartment (°C) [ 3 ].…”

“…Studies of material behavior, such as steel or concrete, under fire conditions, can be carried out both experimentally and analytically, including a number of studies such as those conducted by Oliveira et al [ 3 ] on hot-rolled steel profiles, Li et al [ 7 ] on steel fiber reinforced concrete beams, Issa et al [ 8 ] on reinforced concrete beams, or Schabowicz et al [ 9 ] on façade materials, indicating that the results of tests performed by both methods are in agreement.…”