Colunas mistas esbeltas de aço preenchidas com concreto de alta resistencia em temperatura ambiente e em situação de incendio / Mixed slender steel columns filled with high strenght concrete in room temperature and fire situation

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

In this work, it was investigated in laboratory the effect of fire in slender steel columns unfilled and filled with high strength concrete submitted to three different levels of axial load (30%, 50% and 70%), which is the relation between the axial load to be applied in fire situation and the ultimate load obtained in the column test to room temperature. So, slender steel columns unfilled and filled with high strength concrete were also investigated to room temperature, once the results obtained in this situation have served of reference to the establishment of axial loads applied in fire situation. Altogether 32 slender columns were tested, being 4 unfilled and 4 filled with high strength concrete in room temperature. Besides these columns, 12 were tested filled with high strength concrete in fire situation and 12 unfilled. The experimental values of ultimate load obtained with steel columns unfilled and filled with high strength concrete to room temperature and in fire situation were compared to those determinated from the formulation proposed by EUROCODE 3 (prEN 1993-1-1:2001), EUROCODE 4 (prEN1994-1-1:2003), EUROCODE 3 (prEN 1993-1-2:2002) and EUROCODE 4 (prEN1994-1-2:2002), besides others researchers proposals found in scarce literature about the subject. As a numeric part, the results obtained for mixed columns in fire situation were compared to those determinated by means of using two softwares, the SuperTempCalc and the PotFire. At the end, it was observed that the filling of slender steel columns with high strength concrete have provided significant improvement in the time of resistance to fire in these columns, but it was proved that, in general, only the columns in fire situation which reached the minimum time to fire resistance, stipulated in EUROCODE 4 (prEN 1994-1-2:2002), as in NBR 14432 (2000) in 30 minutes, were the ones that have presented the most satisfactory results

ASSUNTO(S)

high strenght concrete engenharia de estruturas structural engineering concreto de alta resistencia incendios e prevenção de incendio structural steel aço - estruturas columns colunas fire and fire prevention

ACESSO AO ARTIGO

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