Control Parametric Analysis on Improving Park Restoring Force Model and Damage Evaluation of High-Strength Structure

Table 9

Value ranges proposed for the five control parameters of the modified Park restoring force model.

Control parameter	Default	Mild	Moderate	Severe
Stiffness degradation parameter	200~62	62~28	28~9	9~4
Slip or fracture closure parameter	1.0~0.62	0.62~0.34	0.34~0.15	0.15~0.05
Energy degradation parameter	0.01~0.13	0.13~0.36	0.36~0.48	0.48~0.60
Energy-based strength degradation parameter	0.01~0.13	0.13~0.36	0.36~0.48	0.48~0.60
Ductility-based strength degradation parameter	0.01~0.13	0.13~0.36	0.36~0.48	0.48~0.60