Longitudinal Reinforcement Detailing for Columns

7.3.2. Longitudinal Reinforcement Conditions

7.3.2.1 - Longitudinal reinforcement area in columns shall not be less than 1% and greater than 4% of the gross section. Thinner than φ14 in columns and less than 6 bars in circular columns shall not be used.

7.3.2.2 - The total longitudinal reinforcement ratio shall not exceed 6% for overlapped spliced sections.

7.3.3. Arrangement of Longitudinal Reinforcement

7.3.3.1 - Lap splices of column longitudinal reinforcement shall be made in the middle third of the column's free height. The size of the lap attachment shall not be less than lb. The spacing of the transverse reinforcement to be placed along the lap joint shall not be larger than 1/3 of the smallest dimension of the column and 150 mm.

7.3.3.2 - In case the column cross section changes between floors, the slope of the longitudinal reinforcement within the column-beam junction area with respect to the vertical shall not be greater than 1/6. In case of greater cross section change or in the top floor columns; The clamping length of the longitudinal reinforcement of the lower column inside the beam on the opposite side shall not be taken shorter than 1.5lb and 40φ for the tension reinforcement given in TS 500. In cases where there is no beam on the opposite side, clamping will be provided by making a downward bend on the opposite side of the column if necessary. 90 degree horizontal hook or downward bent vertical hook height at least 12 _φ will be ( Figure 7.2 ).

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7.3.3.3 - The longitudinal distance between coupled or welded joints made in side by side longitudinal reinforcements shall not be less than 600 mm.