Modification of the long-term deformation models for steel reinforced concrete columns

It is important to predict the long-term deformation of steel reinforced concrete (SRC) columns especially for high-rise buildings. This research aims to modify the existing creep and shrinkage models for SRC columns. Modified models are suggested by inserting appropriate coefficients to consider the delayed long-term deformation of SRC columns resulted from the slower moisture diffusion due to the wide-flange steel. The coefficients are determined through the parametric study and it is found that the geometry of wide-flange steel is a dominant factor. The suggested models are applicable for square SRC columns with the size of wide-flange steel is over half of the total size of column. Comparison of the prediction with the experiment shows that the suggested models are quite reasonable.