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Effect of rotational stiffness at column base of portal frame at elevated temperature

Xu, Yixiang (2010) Effect of rotational stiffness at column base of portal frame at elevated temperature. In: Sixth International Conference on Advances in Steel Structures 2009, 2009-12-16 - 2009-12-18.

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Abstract

In this paper, numerical models are developed to predict the true behavior of portal frames at elevated temperature. These models are fully capable of capturing the snap-through-buckling and the post-buckling behaviour. It is found that after buckling, the rafter takes the cantenary shape whose compressive stress is transformed into tensile stress and pulls the top of the column inward. A parametric study on the rotational stiffness of the column base is conducted. It was found that at a lower rotational stiffness, the structure experiences snap-through at lower temperature; and increase of rotational stiffness provides stabilization of rafter and which yields a higher buckling temperature. Increasing the partial strength of column base increases the snap-through buckling temperature.