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Elevated Temperature Effect on the Dynamic Characteristics of Steel Columns and Frames
Yunus Emrahan Akbulut,Ahmet Can Altunişik,Hasan Basri Başağa,Sara Mostofi,Ayman Mosallam,Louai F. Wafa 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3
Fire performance of load bearing elements in steel buildings such as columns and frames has major importance for structural designers. This study aims to assess the elevated temperature eff ect on dynamic characteristics of steel columns and frames by conducting sequential heat transfer and modal analyses. A series of fi nite element analyses including heat transfer analysis aere performed on 62 diff erent steel columns and frames. Three-hour part of ISO 834 fi re curve is taken into consideration in the analysis. Modal analyses are conducted for the purpose of providing a more comprehensive image of dynamic characteristics in specifi c duration of elevated temperature. The presented study accommodates the eff ect of various steel profi le types, cross-sectional dimensions and exposure durations on changes in dynamic characteristics. The outcomes of the performed parametric study revealed the decrease in natural frequencies with the temperature growth. The research has also shown the existence of a correlation between temperature variations and changes in mode shapes. The change in mode shapes depends on the profi le type. Mode shapes do not change depending on the temperature in some profi le types, while in some profi le types they change after a certain temperature. The obtained results of the performed sequential analyses are presented in forms of tabulated data and approximate formulas. They can facilitate the damage detection process and contribute in required structural health monitoring measurements while enhance the accuracy of damage assessment for fi re exposed steel structures.