Before revision: The , and are defined as linear functions of the absorbed hysteretic energy : The pinching function is specified as: where: and is the ultimate value of , given by Observe that the new parameters included in the model are: , , , , , , , , , and , where .
After revision: The , and are defined as linear functions of the absorbed hysteretic energy : The pinching function is specified as: where: and is the ultimate value of , given by Observe that the new parameters included in the model are: , , , , , , , , , and .