S

First moment of area of the reinforcement about the centroid of the section

a

A deformation parameter (may be a strain, deflection, curvature or rotation)

«I

Value of a calculated assuming an uncracked section

aii

Value of a calculated assuming a fully cracked section

«e

Modular ratio (= Es/Ec.ef)

"1

A coefficient taking account of the bond properties of reinforcement

"2

A coefficient taking account of the nature and duration of loading

(cs

Free shrinkage strain

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