DUCTILE DETAILING OF RCC COLUMN

IS 13920:2016 _ Ductile detailing of structures

SIZES CRITERIA

• Width to Depth Ratio ≥ 0.4
• Min Width/Depth ≥ 20 db
• Min Width/Depth ≥ 300mm

LONGITUDINAL REINFORCEMENT

• Min Dia of Bar = 12mm
• Min Nos of Bar = 6 Nos & 4 Nos
• Min Ast = 0.8% (as per IS 456)
• Max Ast = 4% x Overall size of member

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REINFORCEMENT SPLICES

• Max Spacing of Links ≤ 100mm
• Lap Length ≥ Ld of larger bar
• Lap Splices Should not be provided ,

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• Max 50% Ast Spliced at Particular Section

SHEAR REINFORCEMENT

• Hook Angle = 135°
• Length of Confinement Zone (L0) ≥ 1/6 of Clear Span, Larger lateral dimension & 450mm
• Hook Length = 8db or 75mm, which ever is larger
• Min Dia of Link = 8mm
• Max Spacing ≤ ¼ of Min column dimension, 6db , 100mm

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• < d/2, As per IS456

SHEAR REINFORCEMENT

PROJECT - 1

PROJECT - 1

• Grade of Concrete : M25
• Grade of Rebar : FY500
• Seismic Zone : III
• Soil Condition : Soft
• Column Size : 350 X 450 mm
• Beam Size : 300 X 450 mm
• Height : 3350mm (Clear Height)

EXAMPLE -1 : COLUMN

PB-1

PB-1

• Considered Grid – 1
• Size : 300 x 450 mm

PB-2

PB-2

PB-3

PB-3

PB-4

PB-4

PB-4

PB-5

PB-5

Size Criteria

• Width = 350 mm > 300 mm (Ok)

> 20db = 20x16 = 320mm (Ok)

• Width to Depth Ratio = 0.77 > 0.4 (Ok)

C1

C1

EXAMPLE -1 : COLUMN

Longitudinal Reinforcement

• Min Ast : 1260 mm2
• Max Ast : 6300 mm2

Required

• Ast Provided : 4-#16 + 6-#12
• Ast Provided : 1482 mm2

Provided

EXAMPLE -1 : COLUMN

Confining Shear Reinforcement

350 mm

450 mm

a

b

a

a

b

a

b

b

b

b

THANK YOU