The development length (Ld) of a deformed reinforcement bar in tension as per limit state design is given by:
A(phi * sigma_s) / (4 * tau_bd)
B(phi * sigma_s) / (2 * tau_bd)
C(2 * phi * sigma_s) / tau_bd
D(phi * tau_bd) / (4 * sigma_s)
Explanation
Development length equation is Ld = (phi * sigma_s) / (4 * tau_bd).

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