Numerical study of steel trusses in fire conditions

Resumo

A structural system under fire is subject to loss of strength and stiffness and may eventually collapse.
In this context, the need for studies to investigate the structural behavior under high temperatures is necessary.
Therefore, the present study proposes to perform numerical analyses of steel trusses in a simplified way,
considering the physical non-linear effects from the deterioration of the material at high temperatures, as described
in NBR 14323. Thus, a methodology was adopted that considers the effects caused by temperature on the stiffness
of the structural element. The calculation of displacements and internal forces is done through the Fool Software.
With the reduction of the stiffness parameter, the results show that the structure displacements increase with the
rise in temperature, and the more accentuated this steel deterioration, the greater the influence of the external load
on the displacement.