## Serviceability limit states General

Ac.eff Act

As.req As .prov

Vcd fct.eff k kc ki ko

Pr as

Effective area of concrete in tension Area of concrete within the tension zone Area of tension reinforcement required Area of tension reinforcement provided

Design shear contribution of the concrete section (see 4.3.2.4.3)

The tensile strength of the concrete effective at the time when cracks are expected to occur Coefficient which allows for the effects of non-uniform self-equilibrating stresses Stress distribution coefficient

Coefficient to take account of the influence of the bond properties of bar on the crack spacing

Coefficient to take account of the influence of the form of the strain distribution on the crack spacing

Average final crack spacing

Average final crack spacings in the x and y direction respectively Design or characteristic crack width

Angle between the shear reinforcement and the longitudinal reinforcement (main steel) Coefficient relating the average crack width to the design width

Coefficient taking account of the influence of the bond properties of bar on the average strain

Coefficient taking account of the influence of the duration of the loading or of repeated loading on the average strain

Strain in the reinforcement taking account of tension stiffening

Greater tensile strain at the boundary of a section subject to eccentric tension

Lesser tensile strain at the boundary of a section subject to eccentric tension

Angle between the reinforcement in the x direction and the direction of the principal tensile stress

Adjusted maximum bar diameter Unadjusted maximum bar diameter (Table 4.11) Effective reinforcement ratio

Stress in the tension reinforcement calculated on the basis of a cracked section

Stress in the tension reinforcement calculated on the basis of a cracked section under conditions of loading leading to formation of the first crack, e.g. Gct = fctm

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