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9)Bar Bending Schedule  

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October 30, 2022

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Design Principles of Concrete Structures

Lecture 9

Bar Bending Schedule

Bar Bending Schedule

Serial #	Bar Designation	Number of Bars	Length of one Bar	Dia of bar	Weight of Steel Required					Shape of Bar
					#10	#13	#15	#19	#25
1	M-1			#25
2	S-1			#10
3	H-1			#15

Σ

Total weight of steel = 1.05Σ , 5% increase, for wastage during cutting and bending

Bar Bending Schedule (contd…)

Bar Bending Schedule (contd…)

90o-Standard Hooks (ACI)

Total Length = L + 18db For R 6db

Table 25.3.2-Minimum inside bend diameters and standard hook geometry for stirrups, ties, and hoops

Table 25.:3.1I – Standard hook geometry for Development
of deformed bars in tension

Bar Bending Schedule (contd…)

Bar Bending Schedule (contd….)

M-1 = 4000 + 2 x 228 – 2 x 40 + 2 x (18 x 20)= 5096

h = 375 – 2 x 40 – 2 x 10 – 2 (15/2) = 260

M-2 = 4000 + 2 x 228 – 2 x 40 + (0.414 x 260) x 2= 5091

H-1 = 4000 + 2 x 228 – 2 x 40= 4376

Bar Bending Schedule (contd….)

Shear stirrups

Number of Bars = 4000 /180 +1 = 24

a = 375 – 2 x 40 – 10 = 285 mm

b = 228– 2 x 40 – 10 =138 mm

Total length of S-1 = 2 (138 + 285 + (4×10 + 75)) = 1076 mm

Bar Bending Schedule

Design of Singly Reinforced Beam by Strength Method

(for flexure only)

Data:

Load, Span (SFD, BMD)

fc’, fy, Es

Architectural depth, if any Required:

Dimensions, b & h

Area of steel

Detailing (bar bending schedule)

Design of Singly Reinforced Beam by Strength Method

Procedure:

1. Select reasonable steel ratio between ρmin and ρmax. Then find b, h and As.
   
2. Select reasonable values of b, h and then calculate ρ and As.
   
3. Using Trial Dimensions
   
   1. Calculate loads acting on the beam.
      
   2. Calculate total factored loads and plot SFD and BMD. Determine Vumax and Mumax.
      
   3. Select suitable value of beam width ‘b’. Usually between L/20 to L/15. preferably a multiple of 75mm or 114 mm.
      

      
      

      Round to upper 75 mm
      

4. Decide the final depth.
   

Preferably “h” should be multiple of 75mm. Recalculate “d” for the new value of “h”

1. Calculate “ρ” and “As”.
   

   Four methods
   

   
   

2. Check As ≥ As min.
   

   As min = ρmin bd (ρmin = 1.4/fy to fc’ ≤ 30 MPa)
   

   7.Carry out detailing
   

8.Prepare detailed sketches/drawings.

9.Prepare bar bending schedule.

Concluded