Table of Contents
Why do you lap rebar?
During the arrangement of steel in Reinforced solid structure, if the required length of single bar may miss the mark. To get the ideal structure length, lapping of two bars next to each other is finished. This is for simple transportation of steel bars to the building site.
What is the importance of the overlap length?
Lap length can be defined as the length that is provided so as to allow the overlapping of two reinforcement bars thereby ensuring safe and efficient transfer of load from one bar to another. When the reinforcement bars are placed; the length of a single reinforcement bar may not be sufficient.
Why do we need overlapping of reinforcement?
Lap length is one of the important term in the reinforcement. During the placement of steel in Reinforced concrete structure, if the required length of single bar may fall short. To get the desired design length, lapping of two bars side by side is done. An alternative to this is to provide mechanical couplers.
What are the benefits of using coupler in building?
Rebar coupler performs like continuous reinforcement. Independent of concrete, splicing develops strength mechanically. Therefore gives ductility in RCC structures independent of the condition of the concrete. The continuity of spliced rebar offers the superb arrangement of grounding electrical current.
What is the length of lapping?
Lapping is usually done where minimum bending stress is encountered. In general, lap length is 50d which means 50 times the bar diameter, if both bars are of same diameter.
What is the purpose of using lap splices in reinforced concrete?
A lap splice is the predominant method used for splicing reinforcing bars. Bars may be spaced apart or in contact. For lap splices, contact splices are preferred for the practical reason that, when wired together, they are more easily secured against displacement during concrete placement.
How far should you lap rebar?
Why do we provide lap length in reinforcement bars?
Lap length is also known as lap splice. 2. Why we provide lap length for rebars? The maximum length of the reinforcement bars is limited to 12.2m ( or 40 ft.). This limited standard length is to facilitate the smooth manufacturing process and to avoid rebar transportation problems.
How is the lap length of a rebar calculated?
In general, the lap length should be calculated as 41d, where d is the diameter of the rebar. For direct stress, the lap length should be twice the production length (2Ld or 30d). For compression, the lap length should be equal to the production length and should not be less than 24d.
What happens when the rebars are not long enough?
The RCC structure may develop cracks due to the splitting of rebars at the insufficient lap length zones. This ultimately leads to the failure of the structural member as the load transfer mechanism fails when the rebars of insufficient lap length cannot bear the superimposed load over the structure.
When do you need to lap a bar?
Due to the limited length of the bar, lapping of bars are required in a member of more than 12m in length or where the length of bar required is more than 12m. Lap Length:- Overlapping Length or Lap Length is provided to maintaining the continuity of bars in order to safely transfer the load from one bar to another bar.