Ways to Get Desired Development Length of Bar

The Code IS456:2000 recommends the check for development length by following equation:

[(M₁ / V) + l₀  ] >  L_d

If the check is not satisfied than following measure may be adopted for satisfying the check:

1. By reducing the diameter of the main steel to have lesser value of L_d, but keeping the area of steel at the section unchanged.
2. By increasing the value of l₀ by providing extra length of the bar over the bend.
3. By reducing the number of bend of bars.

Checking for development length is essential at the following sections:

• At simple supports.
• At cantilever supports.
• At points of contraflexure.
• At points of bar cut off.
• In beams of very short spans.
• For stirrups and transverse ties.