A mathematical model for structural behavior of timber columns under fire has been proposed. The semi-analytical study has been carried out for evaluating the load-carrying capacity of timber columns exposed to fire. Particular emphasis has been given to critical buckling loads. For this purpose, a parametric study has been performed by which the influence of slenderness ratio, load level, and water content on critical buckling loads of timber columns have been investigated. The results of this preliminary study showed that the present semi-analytical method is conservative compared to the two simplified calculation methods offered by Eurocode 5 if the transfer of water is neglected, while, on the other hand, the results agree well for a water content of 12%. Moreover, for higher water contents, the present semi-analytical model is non-conservative compared to the Eurocode 5 methods.
B.06 Other
COBISS.SI-ID: 5504097The paper presents a semi-analytical method for computational assessment of times-to-failure and critical temperatures of timber columns exposed to fire. The method is based on the 2D thermo-mechanical analysis, in which a moisture-thermal state of columns is modeled by Luikov equations and, on the other hand, the exact mechanical analysis including buckling behavior of columns, which is modeled by linearized Reissner’s kinematic equations. The model predicts the char formation in the timber column as a function of its temperature, moisture content, and density. As a result, critical temperatures and times-to-failure of charred timber columns exposed to fire are calculated for different exposure times, different dimensions of the column and different temperature-dependent thermo-mechanical parameters.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 5069409An efficient mathematical model for studying the buckling behavior of geometrically perfect elastic columns with interlayer slip and stochastic material properties is presented. It is based on Reissner’s geometrically exact beam theory and linearized stability theory and is capable of predicting exact critical buckling loads. Therefore, this mathematical model is used to calculate the buckling loads of two-layer composite columns with interlayer slip and stochastic material properties of individual layers and connection between them. The statistical distributions of the critical buckling load are evolved based on simulations performed using well-known Monte Carlo method. As a result, a histogram and the approximated probability density functions and the cumulative distribution functions of critical buckling load are obtained for different material properties.
D.03 Membership in foreign/international boards/committees
COBISS.SI-ID: 5451105