Inelastic Earthquake Response Analysis and Damage Assessment of Retrofitted Rc Structures Using Extended Fiber Model

Abstract

Retrofitted reinforced concrete structures were modeled using fiber modeling technique extended to include the stress-strain relation of repair material such as grouted epoxy resin or covered steel plates. Earthquake response analysis was then conducted using inelastic hysteretic rules. Effectiveness of seismic retrofit was evaluated through comparison of ductility, hysteretic energy and damage index with the original members. The proposed method was verified by the test results of retrofitted RC beam members. As an application of this method, earthquake response of a strengthened RC bridge pier was simulated. The bridge pier with reinforcements terminated at mid-height was modeled including retrofitting by steel jackets. Thin steel jacket showed higher capacity than thick one because of its larger ductility.