Inelastic Strength for Fire Resistance of Composite I-Beam Covered by Insulation Material Subjected to Basic Loading Condition

Abstract

This paper presents a nonlinear numerical study on the moment resistance of composite steel-concrete beam using fire insulation subjected to various fire scenarios and basic loading conditions. The temperature-dependent material properties of fire insulation, concrete and steel were taken into consideration. The nonlinear finite element analysis was done by utilizing a commercial finite element program, ABAQUS. The obtained moment capacity of the composite I-beam from the current fire code was also performed and compared. The results showed that the fire scenarios and the fire insulation thickness have a great influence on the temperature distribution and strength degradation of the composite beam. The capacity of the beam in hydrocarbon fires, which is the most severe scenario, decreases faster than that in ISO834 standard fire and external fire. The fire resistance of the beam increases as the fire insulation thickness increases due to the temperature degradation in the steel beam. The calculated results from the current fire codes give conservative value at normal temperature and low temperature. The current fire codes can give unconservative values at high temperature when there is a great temperature discrepancy between parts of the beam. A new factor was proposed to determine the fire moment resistance of the composite beam with non-uniform temperature.

The performance of composite beams with X-HVB shear connectors after being subjected to fire exposure

“…Nguyen and Park (2021) [10] studied the effect of the thickness of fire insulation on the strength degradation and temperature distribution of the composite beam. It was noticed that due to temperature degradation in the steel beam, the fire resistance of the beam improves as the fire insulation thickness increases.…”

Numerical study on buckling capacity of steel H-beams under non-uniform temperature distribution

“…In structural analysis, a four-node reduced integration shell element S4R was utilized to simulate the steel beam, which was also used in previous studies (Yin and Wang, 2003; Kucukler, 2020; Nguyen et al. , 2019; Nguyen and Park, 2021a, b; Xing et al. , 2021).…”

“…In this research, a numerical investigation on the LTB strength of the simple steel H-beam subjected to non-uniform heating conditions was conducted by employing the finite element analysis (FEA) program, ABAQUS (2020), which was also used in previous studies (Kucukler, 2020; Nguyen et al. , 2019; Nguyen and Park, 2021a, b; Xing et al. , 2021).…”