- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 21 Jan 2021
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- Slabs with or without openings (rectangular, circular, non-rectangular pyramid slab, triangular slab etc.)
- Beams with or without openings (shallow and deep beams)
- Columns with different shapes, such as; rectangular, L, T, circular, octagonal, cross etc.
- Gravity loads and lateral loads (particularly for the seismic forces).
- The rehabilitation and strengthening of damaged structures.
 Do's for detailing
- Create perfect drawings and if possible label each bar and demonstrate its shape for transparency.
- Create a bar bending schedule when required.
- Specify perfect clear cover, nominal cover or effective cover to reinforcement.
- Determine detailed locations of openings or holes and provide sufficient details for reinforcements around the openings.
- The grade of steel should be mentioned in the drawing.
- Deformed bars should not contain hooks at their ends.
- Show enlarged details at corners, junctions of walls, beams and column joints.
- Congestion of bars should not occur at points where members overlap.
- For bundled bars, lapped splice of bundled bars should be created by splicing one bar at a time; such separate splices inside the bundle should be staggered.
- Ensure that hooked and bent up bars are arranged and contain sufficient concrete protection.
- Specify all extension, construction and contraction joints on plan and provide details for such joints.
- The position of construction joints should remain at the point of minimum shear approximately at mid or adjacent to the mid points. It should be developed vertically and not in a sloped manner.
- When splices are arranged in bars, they should remain out of the sections of maximum stresses as far as possible and should be staggered.
- When the depth of beams surpass 750 mm in case of beams devoid of torsion and 450 mm with torsion provide face reinforcement according to IS456-2000.
- Deflection in slabs/beams is minimised with the compression reinforcement.
- Only closed stirrups are recommended for transverse reinforcement. For members susceptible to torsion and for members susceptible to reversal of stresses similar to seismic forces.
- To adapt bottom bars, secondary beams should be created shallower than primary beams, at least by 50 mm.
- A reinforced column should contain minimum six bars of longitudinal reinforcement to be used in transverse helical reinforcement for circular sections.
- At least four bars one at each corner should be provided in the case of rectangular sections.
- Retain exterior dimensions of columns fixed so far as possible to use the forms again.
- 2 grades of vertical bars should not be used in similar component.
 Do not's general
- Reinforcement should not extend over an expansion joint and the break among the sections should be finished.
- Flexural reinforcement should not preferably be discontinued in a tension zone.
- Bars greater than 36 mm dia should not be bundled.
- Lap splices should not be utilised for bars greater than 36 mm dia. except where welded.
- When dowels are used, their diameter should not go beyond the diameter of the column bars in excess of 3 mm.
- When bent up bars are used, their participation towards shear resistance should not surpass 50% of the total shear to be countered. Single bent up bars alias cranked should not be used in earthquake resistance structures.
 Related articles on Designing Buildings Wiki
- Carbon fibre.
- Concrete-steel composite structures.
- Concrete vs. steel.
- Grouting in civil engineering.
- Metal fabrication.
- Prestressed concrete.
- Reinforced concrete.
- Structural steelwork.
- Stainless steel.
- Types of column.
- Weathering steel.
 External references:
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