Comparison of Completely and Partially Concreted Composite Columns According to Eurocode 4

Abstract

The paper provides a review of the analysis of fully and partially concreted sections of coupled columns with a comparative analysis of the obtained results. The purpose of this paper is to perform an analysis of fully concreted composite columns with steel profile core and additional soft reinforcement and partially concreted steel profile columns and additional soft reinforcement. In the analysis, the same and similar cross-sections are taken to see how effective it is in carrying axial forces and biaxial bending for comparing fully coupled columns with partially coupled columns. The entire analysis is carried out according to Eurocode 4 and theoretical assumptions are introduced in the analysis and biaxial bending and shearing of the cross sections of the two types of coupled columns are calculated. The analyzed sections are examples from practice loaded with real loads. The materials of the spliced columns are rigid steel profiles with steel grades S235 – S460, concrete grades C20/25 – C50/60, soft reinforcement quality S460 and B500 with reinforcement percentages of 1-6% and an assumed fire-resistance scenario. from R30 – R240. Combinations of calculations for different brands of concrete, different qualities of steel and reinforcement for different cross-sections with percentages of reinforcement, as well as combinations of moment ratios and comparisons of cross-sections, have been made. From the given static influences, the cross section for combined pressure and biaxial action is determined and interaction N–M diagrams are determined along both axes with percentages of reinforcement shown as a final output that can be used in future simplified calculations. Results and conclusions were obtained from the comparison, with which one can see the differences of coupled columns of fully and partially coupled sections.