Civil Engineering Reference
In-Depth Information
Table 4.2 Minimum section dimensions and minimum reinforcements of additional columns
Dimension
Reinforcement
Style of columns
Cutline
(Width
×
height)(mm) Main reinforcement
Stirrup
Rectangular
250
×
150
4
φ
12
φ
6 @150
∼
200
Flat
500
×
70
4
φ
12
φ
6 @200
L-shape
600
×
120, each side
12
φ
12 double-layers
φ
6 @200
Note: Within a distance of 500 mm above and below the floor or roof, the spacing of the additional
columns' stirrups should be densified to 100 mm.
Fig. 4.13
Retrofitting for connections of constructional columns and original beams.
(1) Section dimensions and reinforcements
The section dimensions and reinforcements of additional ring beams may not be less than
the requirements listed in Table 4.3.
(2) Additional ring beams should be closed at the same elevation
Ring beams at both sides of the movement joint should be closed. If they meet with an
opening, measures should be taken to make them close. And if they meet with brick buttress
