Estudo numérico em vigas de madeira submetidas a altas temperaturas

Abstract

The main objective of this work is to investigate the behavior of wooden beams submitted to bending for room temperature and also for varied thermal conditions, under constant temperatures across the entire cross section and under exposure to fire. The numerical simulations were performed using the Ansys software, in accordance with the proprieties defined of the material. Three numerical calculation models by finite elements were developed, the first performing a mechanical analysis with increment load at room temperature, the second for a mechanical analysis with an increment load at different values of constant temperature and the third for a thermal analysis of exposure to the curve of fire ISO834 coupled to mechanical analysis with incremental load. Was realized the numerical simulation of an experimental test, and the others for 2 beam geometries, each of which was analyzed at 6 constant temperature values and 6 different exposure times. Analyzes were made regarding the maximum applied load, the resistant moment, the carbonization thickness and the carbonization rate, as necessary. The results obtained numerically were compared with the experimental test providing coherent results, and with the simplified method proposed by Eurocode 1995-1-2 which in general remains in favor of safety when determining the strength properties of the wood through the method of reduced section.