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Authors
Advisor(s)
Abstract(s)
Partially encased composite columns (PEC) present better structural performance under fire situation than simple steel columns. Thus, it is not possible to calculate the fire resistance of its components, taking just into account the temperature of the steel, because the concrete increases considerably the fire resistance of the column.
However, the annex G of EN 1994-1-2presents the balanced summation method to determine the fire resistance of the partially encased columns, by calculating the buckling resistance around the weak axis when exposed to the standard fire curve ISO834 for different fire ratings.
Thereafter a new proposal was presented to improve this simple method, 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.
Later the finite element method is used to calculate the buckling resistance of partially encased columns using an incremental and iterative procedure, investigating the behavior of thirty different PEC cross sections, being ten of each specified steel profile series (HEA, HEB and HD) for two different columns height (3 and 4 meter).
The results of the numerical solution are compared with the balanced summation method of annex G from EN 1994-1-2 as well the new proposed solution model.
Description
Mestrado de dupla diplomação com a Université Libre de Tunis
Keywords
Partially encased columns Composite columns Fire resistance Balanced summation method ANSYS Buckling resistance