BI-DIMENSIONAL THERMAL MODELLING OF A TIMBER-CONCRETE COMPOSITE CROSS-SECTION IN FIRE

Felipi Pablo Damasceno Fernandes¹; Jorge Munaiar Neto¹

¹ Universidade de São Paulo

doi:10.20906/CPS/CILAMCE2017-0254

Resumo

The timber-concrete composite structure is a type of construction in which a timber beam is connected to an upper concrete slab using connectors. Timber-concrete composite structures have some advantages, highlighting good behavior in fire, having similar performance to common reinforced concrete floors. The fire behavior of timber-concrete composite members is governed by each of its components. The thermal action in wood causes its transformation in char. Thus, the rate of char formation (charring rate) indicates the residual cross-section of wood and it's essential in fire engineering studies. The fire engineering studies can be performed by numerical, experimental or both approaches. The numerical approach is a good method for fire engineering studies, been economical and capable of show many different situations. In this paper, a numerical model is proposed using the finite element program Abaqus, being studied the interference of refinement of the finite element mesh in the results. It was observed that the use of numerical models is a good alternative for the study of timber-concrete composite structures in fire, being possible to follow the evolution of char rate as well the temperature profile of the cross-section and that a greater mesh refinement yields better results.

Palavras-chave: composite beams; timber; concrete; fire