An innovative ductile steel connection for precast reinforced concrete frames

Abstract

Moment‐resisting frames (MRFs) are vital systems for dissipating seismic energy through plastic hinge formation at beam ends. In conventional MRFs, beams must resist both gravity and seismic forces, making repair after earthquakes difficult, particularly in reinforced concrete (RC) structures. Repairing RC beams usually demands extensive retrofitting, adding cost and complexity. This study proposes an innovative RC MRF system using ductile steel connections. These elements are designed to localize plastic hinges, allowing beams and columns to remain largely elastic during seismic loading. The approach enhances resilience and simplifies post‐earthquake repairs, as steel connections can be replaced or retrofitted more easily than RC components. Results showed that steel connections act as ductile fuses while preventing nonlinear behavior in beams and columns, thereby preserving structural integrity. To support implementation, design equations are provided to determine optimal connection geometry based on material properties and seismic demands. By leveraging ductile steel connections, the proposed system improves the seismic performance of RC MRFs while lowering repair costs and material consumption, offering a sustainable and cost‐effective solution for earthquake‐resistant design.