Rebar details of Beams

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 Beams

SCOPE: 

 Ground / Tie beams 
 Floor beams 
 Capping beams 


DETAILING STANDARDS: 

Nominal Cover to Reinforcement:

Internal : 30mm + Δcdev (5 or 10mm) 
External : 35mm + Δcdev (5 or 10mm) 
Earth face : 45mm + Δcdev (5 or 10mm) 
Max. cover to avoid concrete spalling : 40mm to link or 70mm to axis of main bars or surface mesh to be provided

Spacing and Size of Main bars:

Minimum spacing : 75mm (at laps) 
Maximum spacing : 300mm 
Minimum bar size : 12mm

Spacing and Size of Side bars (if beam depth ≥ 1000mmE or 750mmB ):

Minimum spacing : ≥ 25mm or Ø 
Maximum spacing : 250mm 
Minimum bar size : 16mm 

Spacing and Size of Links:

Minimum spacing : ≥ 100mm or [(50 + (12.5 x No of legs)], whichever is greater 
Maximum spacing : ≤ 300mm or 0.75d or (15 x Compression bar Ø) E or (200mm at laps, if both lapping bar Ø > 20 and the cover < 1.5Ø) B 
Maximum lateral spacing of legs : ≤ 0.75d or 600mm 
Minimum bar size : 8mm

Bar arrangements:

Cage Method: 

Detail – A : (If the span is within stock length) 



Detail – B : (If the span exceeds the stock length)




Crank Method: 

Detail – A : (If the span is within stock length)




Detail – B : (If the span exceeds the stock length)



Capping Beam: 




1. Bottom bar lap to be away from planted columns (preferably 0.25L from the face of column). 
2. Top bar lap to be away from bottom bar lap and to be near/at the face of planted column. 
3. Piece bars to be moved down/up to avoid clashes with cross beam. 

Primary, Secondary & Tertiary Beam Support Conditions: 



1. Primary beam is a beam carried by vertical supports (i.e Pile / Column / Wall).
                        a. Bars to be spliced at supports for flexible placing and piece bars to be placed at 1st layer adjacent to main bars. 
                        b. Links to be stopped at the supports. 

2. Secondary beam is a beam carried by primary beam.
                        c. Bars to be spliced to avoid clashes with primary beam bars. 
                        d. Links to be stopped at the face of primary beam.

3. Tertiary beam is a beam carried by secondary beam.
                        e. Bars to be spliced to avoid clashes with secondary beam bars. 
                        f. Links to be stopped at the face of secondary beam.


Moment Connection Details:




Simply Supported Connection Details:



Note : Beam reinforcement to be continued right across the foundation if no top bars present in the foundation and to be tied with column or wall starters using horizontal U-bars if the beam is designed as tie beams.

Links arrangements :

Additional Lateral Links : 




Open and Closed Links : 


Longitudinal space taken by each set of links to be ≤ 3Ø to avoid congestion



Torsion Links : 


    a. Where links are used for Torsion to be detailed as shape code '63' 

    b. Maximum spacing of torsion links ≤ 0.125 x Circumference of cross section or least dimension of cross section or maximum spacing of other links. 




Links for Deeper Beams 


Lap at vertical leg permitted as per EC2 provided that the link is not required to resist torsion and the same shall be confirmed with client prior to detailing.



Side Bars Connection Details: 


Spacer Bars:

The spacer bars to be detailed to maintain the gap between two or more layer of main bars, the diameter of spacers to be equal to main bars, but should not be less than 25mm and spacing to be 1000mm.



Where,
Superscript with B means British code
Superscript with E means EC2
T L is Tension Lap
T A is Tension Anchorage
E A is Effective Anchorage
d is Effective Depth
L is effective span



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