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

Abstract EN

In the dynamic time-history analysis of structural elastoplasticity, it is important to develop a universal mathematical model that can describe the force-displacement characteristics for restoring force.

By defining three control parameters (stiffness degradation, slip closure γ , energy degradation β ), the Park restoring force mathematical model can simulate various components.

In this study, the Park restoring force has been improved by adding two control parameters (energy-based strength degradation β e and ductility-based strength degradation β d ).

Based on the testing data, the constitutive model is input and 55 numerical models are developed to analyze the effects of various parameters on structural behavior.

Conclusion.

(1) β has determinative effect on structural behavior; the effect of β e is basically consistent with that of β ; α has significant effect on shear forces and bending moments; γ has significant effect on displacements and accelerations; β d has significant effect on shearing forces, acceleration, and total energy consumptions.

(2) Based on the classification of four types of damage level, the recommended values for α , γ , β , β e , and β d are presented.

(3) Based on the testing data of high-strength columns, the recommended values for the five control parameters of the improved Park restoring force model are presented.