Admin What is Lap length in reinforcement?
If length of a bar is not enough to keep the reinforcement, we have to lap two steel bars. Normally, lapping position is at where near the minimum shear force is acting. Normally lap length is 50D meaning 50 times the bar diameter if both bars are of same diameter.
What is bar splicing?
The method used to join the reinforcement bars, so that the force is transferred effectively from one bar to the other is called as splicing. Force is first transferred to the concrete through bond from one bar and then it is transferred to the other bar forming the splice through bond between it and concrete.
How do you measure lap length?
This amount of overlapping between two bars is called “lap length”. 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….Lap length for M20 concrete:
- Columns – 45d.
- Beams – 60d.
- Slabs – 60d.
How do you calculate lap splice length?
2. Lap length in Tension
- Class A Splice: Lap Length ls = 1.0 ld.
- Class B Splice: Lap Length ls = 1.3ld.
- ls = 0.0005fy (d) ; [ For fy less than or equal to 60,000psi]
- ls = (0.0009fy – 24)d; [ For fy > 60,000 psi]
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.
How do you calculate overlap length?
In general, lap length is 50d which means 50 times the bar diameter is provided if both bars are of same diameter. For flexural tension – Ld or 30d whichever is greater is considered. For direct tension – 2Ld or 30d whichever is greater is considered.