The concrete damaged plasticity model2829 provides a general capability for modeling concrete and other quasi-brittle materials, i.e. rock, mortar, ceramics in all types of structures and is designed for applications in which concrete is subjected to dynamic loading due to earthquake under low confining pressures. This model is not suitable for concrete under high confining pressures which would lead to ductile behavior. This model can describe the irreversible damage that occurs during the fracturing process of concrete under relatively low confining pressures. Using this model, the following behaviors of concrete can be described:

► Different behaviors for tension and compression. (Failure tensile stress and ultimate compressive stress)

► Different reductions of the elastic stiffness when unloading for tension and compression.

► Stiffness recovery effects during cyclic load reversals

                                                                     Compression Hardening Curve                                          Tension Softening Curve

                                                      Compression Damage Curve                                             Tension Damage Curve

Tension Damage

Compression Damage