Effect of stress-strain relationship on the elasticity modulus and moment capacity

الملخص EN

The Effect of strain on the elasticity modulus and moment capacity of members are studied using different types of stress-strain relationships (linear, elasto-plastic, elastic perfectly plastic, bi-linear, tri-linear and other continuous models) for bending with or without axial loads using the steps of solution shown in the research.

Generally in all cases inelastic modulus reduced with increasing the strain and stress level and significant decrease is occurred in the value of inelastic modulus, the value of inelastic modulus reduces to about (50 %) of its initial value when the stress value within (0.

4-0.

5) of the yield strength.

Effect of stress ratio (RF) and strain ratio (R£) are also studied.

Suitable equations are proposed to estimate the values of inelastic modulus and moment capacity.