Reinforcement Development Length

The reinforcement development length is calculated per 3.12.8.4:

l_{d} \geq \frac{f_{y}}{4.2 β \sqrt{f_{c u}}} d_{b}

BS8110: Part 1, Equation 48 and Table 3.27

For lightweight concrete the development length above is increased by 20% per BS8110 : Part 2, Section 5.9.