Why is it written "Top of column is articulated", "bottom of column is hinged" for some columns (although there are columns and beams above and below) in the sub-floor columns. What could be the reason why there is an articulated situation in the mezzanine columns in my project? Note: For columns with ZK sign in Column Reinforced Concrete / TDY Equation 3.3 Control, for some columns it says "The top of the column is hinged", "The bottom of the column is hinged".