Title:
Extending GFRP Rebar Use to Seismic Zones: Hybrid RC Design and Code Modifications
Author(s):
Federico Tuozzo
Publication:
Web Session
Volume:
ws_F24_FedericoTuozzo.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
11/3/2024
Abstract:
Glass Fiber-Reinforced Polymer (GFRP) rebars have evolved as a promising alternative to steel in reinforced concrete (RC). However, their linear elastic behavior limits their applications to non-seismic zones such as seismic design category A (SDC-A), per ACI 440.11. This study proposes an innovative approach to design RC members as hybrid sections, combining steel and GFRP reinforcement. Placing GFRP rebars on the exterior ensures durability, whereas steel reinforcement on inner side improves ductility and energy dissipation. The study suggests provisions to apply to current codes (i.e., ACI 440.11, and ACI 318), to be applied to hybrid-RC sections: detailed design criteria and specific guidelines are provided to facilitate the implementation of hybrid-RC sections. A design example is presented to discuss the performance of GFRP-RC, steel-RC, and hybrid-RC sections in terms of ductility and energy dissipation, thereby validating proposed assumptions. A comprehensive finite element analysis was also performed to verify the proposed modifications to existing code provisions. It was observed that with proposed methodology and modifications, the use of GFRP reinforcement may be extended to active seismic regions, overcoming its current limitations. This work represents a significant technological and normative advancement, extending the use of GFRP bars to seismic zones, thus promoting innovation and sustainability. Additionally, the proposed modifications to the ACI codes could pave the way for future updates, accommodating emerging materials and design approaches.