Rebar Development Length

Calculation Steps:

Define Parameters
• d_b_display

  Diameter of longitudinal bar

  in
• Ψ_t

  Casting position factor
• Ψ_e

  Bar coating factor
• Ψ_g

  Reinforcement grade factor per Table 25.4.2.5
• Ψ_s

  Bar size factor per Table 25.4.2.5; 0.8 for #6 and smaller, 1.0 for #7 and larger
• Ψ_tΨ_e

  Product of casting position and coating factors, limited to 1.7 per 25.4.2.5
Cl. 25.4.2.3(b) - Simplified Method (Other Cases)
• l_d_simplified_other

  Development length per Cl. 25.4.2.3(b) for other cases

  in
Reference Table
• Table of Development Lengths:

  Bar / f'c	4 ksi	5 ksi	6 ksi	7 ksi	8 ksi	9 ksi	10 ksi
  #3	22	20	18	17	16	15	14
  #4	29	26	24	22	21	19	18
  #5	36	32	30	27	26	24	23
  #6	43	39	35	33	31	29	27
  #7	63	56	51	48	45	42	40
  #8	72	64	59	54	51	48	45
  #9	81	72	66	61	57	54	51
  #10	91	81	74	69	64	61	58
  #11	101	90	82	76	71	67	64
User Notes:
User notes