How can I calculate the development length for a slab?
A development length can be defined as the amount of reinforcement(bar) length needed to be embedded or projected into the column to establish the desired bond strength between the concrete and steel (or any other two types of material).
Development length is the length overlap of bars tied to extend the reinforcement length. is about 50 to 60 times the dia of bar is consider to safe. Both rules are in practice.
Reason for providing Development length
- To develop a safe bond between the bar surface & the concrete so that no failure due to slippage of bar occurs during the ultimate load conditions.
- Also, the extra length of the bar provided as development length is responsible for transferring the stresses developed in any section to the adjoining sections (such as at column beam junction the extra length of bars provided from beam to column).