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Where is:

l_b,rqd

• The basic required anchorage length

ϕ

• The bar diameter

σ_sd

• The design stress of the bar

f_bd

• The design value of the ultimate bond stress

Where is:

f_ctd

• The design value of concrete tensile strength

η₁

• The coefficient related to the quality of the bond condition and the position of the barduring concreting (value is 1.0 for good bond conditions and 0.7 for other cases)

η₂

• The coefficient related to the bar diameter. Value is 1.0 for all bars with diameter up to 32mm. The coefficient is calculated using following formula for other cases:

Where is:

l_b,min

• The minimum anchorage length

α₁

• The coefficient in accordance with table 8.2 considering the effect of the bars form assuming adequate cover

α₂

• The coefficient in accordance with table 8.2 considering the effect of concrete minimum cover

α₃

• The coefficient in accordance with table 8.2 considering the effect of confinement by transverse reinforcement

α₄

• The coefficient in accordance with table 8.2 considering the influence of one or more welded transverse bars along the design anchorage length

α₅

• The coefficient in accordance with table 8.2 considering the effect of the pressure transverse to the plane of splitting along the design anchorage length