Forecasting the Behavior of Steel Beams with Corrugated Walls Under the Thermal Exposure of a Fire

Abstract

The article presents the results of a research on the behavior of steel beams with corrugated walls with and without fire protection under the thermal influence of fire using numerical integration of the equations of dynamics and stress-strain state using the finite element method. According to the results of the analysis of the existing methods of fire resistance assessment, it was established that it is expedient to apply refined methods using explicit method of numerical integration of dynamics equations, which allow reproducing all the most significant features of temperature-force response of the investigated beams on thermal influence of fire. Moreover, the indicated instruments are less expensive comparing to the fire tests. In order to conduct computational experiments, the work presents the corresponding mathematical models based on numerical approximation of dynamics equations using the finite element method taking into account the nonlinear behavior of the beam material under the thermal influence of fire. Based on the research results, there was developed a method for assessing the fire resistance of steel corrugated beams, taking into account the structure parameters of fire protection lining, which makes it possible to predict the increase in fire resistance of the beam to bring it into line with the required fire resistance class.