Stress and strain of cracked sections

Two extreme states are to be considered in the calculation of displacements in a cracked member, as will be further discussed in Chapter 8. In state 1, the full area of the concrete cross-section is considered effective and the strains in the concrete and the reinforcement are assumed to be compatible. In state 2, concrete in tension is ignored; thus, the cross-section is assumed to be com¬ posed of the reinforcement and concrete in compression. The cross-section in state 2 is said to be fully cracked.