NUMERICAL ANALISYS OF COLD-FORMED STEEL COLUMNS WITH FIRE PROTECTION IN FIRE SITUATION
Marina Machado Leal dos Santos1; Tiago Ancelmo de Carvalho Pires de Oliveira2; José Jéferson do Rêgo Silva2
1 Universidade Federal de Permabuco; 2 Universidade Federal de Pernambuco
doi:10.20906/CPS/CILAMCE2017-0007
Resumo
Cold formed steel sections are widely used due to its high ratio between charge and resistance, moreover they ensure clean construction and a significant reduction of material waste. One of the greatest disadvantages of this type of structure is the mechanical properties reduction when subjected to elevated temperatures. Columns requires special attention on this situation because the collapse of one single element can affect the whole structure. To ensure the adequate fire resistance, one method widely used is the application of fire protection materials to the structure. Experimental programs are essential to understand the comportment of the protected steel however; they require maneuver, expensive materials, and high consumption of energy. At this point, it is essential to develop a numerical model with an elevated degree of reliability to preview how the protected columns would behave in fire situation. It is also important to ensure its computational efficiency and reproducibility. Many studies where developed in the aim of numerically previewing the steel behavior in fire situation. One of the most common ways to improve the profile fire resistance is the utilization of a fire protection material. Numerical simulations were also developed in order to better understand the heat transfer between the protection and the steel element. Noticing that an efficient numerical model is important to preview the behavior of unprotected and protected steel structures, the aim of this work is: To verify the fire resistance of thin walled columns using a tri-dimensional and bi-dimensional, no-linear, finite elements model, using the software ABAQUS; Compare the results obtained by the numerical model with the experimental results obtained by Costa (2013) to evaluate with model is more efficient and validate the method; Evaluate the material parameters present in the Brazilian standard NBR 14323/2013 in order to verify with is the best coefficient of mechanical reduction properties for the analyzed column;
Palavras-chave: Column; Cold-Formed Steel Section; Steel Fire Protection; Numerical Model; Fire Resistance