- Prepare drawings properly & accurately if possible label each bar and show its shape for clarity.
- Prepare bar-bending schedule, if necessary.
- Indicate proper cover-clear cover, nominal cover or effective cover to reinforcement.
- Decide detailed location of opening/hole and supply adequate details for reinforcements around the openings.
- Use commonly available size of bars and spirals. For a single structural member the number of different sizes of bars shall be kept minimum.
- The grade of the steel shall be clearly stated in the drawing.
- Deformed bars need not have hooks at their ends.
- Show enlarged details at corners, intersections of walls, beams and column joint and at similar situations.
- Congestion of bars should be avoided at points where members intersect and make certain that all rein. Can be properly placed.
- In the case of bundled bars, lapped splice of bundled bars shall be made by splicing one bar at a time; such individual splices within the bundle shall be staggered.
- Make sure that hooked and bent up bars can be placed and have adequate concrete protection.
- Indicate all expansion, construction and contraction joints on plans and provide details for such joints.
- The location of construction joints shall be at the point of minimum shear approximately at mid or near the mid points. It shall be formed vertically and not in a sloped manner.
Do’s – Beams & Slabs
- Where splices are provided in bars, they shall be, as far as possible, away from the sections of maximum stresses and shall be staggered.
- Were the depth of beams exceeds 750mm in case of beams without torsion and 450mm with torsion provide face rein. as per IS456-2000.
- Deflection in slabs/beams may be reduced by providing compression reinforcement.
- Only closed stirrups shall be used for transverse rein. For members subjected to torsion and for members likely to be subjected to reversal of stresses as in Seismic forces.
- To accommodate bottom bars, it is good practice to make secondary beams shallower than main beams, at least by 50mm.
Do’s – Columns
- A reinforced column shall have at least six bars of longitudinal reinforcement for using in transverse helical reinforcement for CIRCULAR sections.
- A min four bars one at each corner of the column in the case of rectangular sections.
- Keep outer dimensions of column constant, as far as possible, for reuse of forms.
- Preferably avoid use of 2 grades of vertical bars in the same element.
Donot’s – General
- Reinforcement shall not extend across an expansion joint and the break between the sections shall be complete.
- Flexural reinforcement preferably shall not be terminated in a tension zone.
- Bars larger than 36mm dia. shall not be bundled.
- Lap splices shall be not be used for bars larger than 36mm dia. except where welded.
- Where dowels are provided, their diameter shall not exceed the diameter of the column bars by more than 3mm.
- Where bent up bars are provided, their contribution towards shear resistance shall not be more than 50% of the total shear to be resisted. Use of single bent up bars (cranked) are not allowed in the case of earthquake resistance structures.