bachelorThesis
Pilares mistos parcialmente revestidos: resistência e rigidez em situação de incêndio
Fecha
2017-11-28Registro en:
CALIÓ, Leonardo Jorge. Pilares mistos parcialmente revestidos: resistência e rigidez em situação de incêndio. 2017. Trabalho de Conclusão de Curso (Bacharelado em Engenharia Civil) - Universidade Tecnológica Federal do Paraná, Campo Mourão, 2017.
Autor
Calió, Leonardo Jorge
Resumen
Partially encased columns of steel and concrete have a high resistance when compared to steel columns. However it is not possible to measure the resistance of all members of its composition taking into account only the temperature of the steel. The resistance of these elements under fire conditions depends on the temperature evolution during the period exposed to fire. The annex G of Eurocode EN 1994-1-2 [1], through the balanced summation method allows to calculate the buckling resistance of partially encased columns when submitted to standard fire for different rating time of exposure. A new proposal was presented to be used with this methodology [2]. New formulas were presented to calculate the plastic resistance to axial compression and the flexural stiffness of each component of the cross section. This work aims to evaluate and investigate the new proposal, and when necessary improve it. The new formulae was developed to determine the buckling resistance load, taking into consideration the average temperature of all components of the cross section, the residual height of the web based on 400ºC isothermal and the residual concrete area based on the 500ºC isothermal. The advanced calculation method will be carried out using the finite element program ANSYS ®, being the results used to investigate these new formulations, taking into consideration a cross section totally surrounded by fire. The simplified method is based on the temperature effect on four components (flanges, web, reinforcement and concrete) for specific fire resistance: R30, R60, R90, R120 minutes. The results obtained by the numerical simulations will be used to compare with the formulae from new proposal [2] as well as the formulae from EN 1994-1-2 annex G [2].