Seismic Design Review on Chevron-Braced Frame Systems

A study on the theory development of chevron-braced frame (CBF) systems, also known as inverted-V bracing, are a widely adopted lateral force-resisting system in steel structures, particularly in regions prone to seismic activity. Such steel structures are widely used for building construction in Japan. The seismic design of chevron-braced frames presents unique challenges due to their complex inelastic behavior under earthquake loading. Key issues include brace buckling, unbalanced vertical forces on the beam due to asymmetric brace yielding, and potential formation of plastic hinges in the beam. This paper aims to provide a comprehensive overview of the seismic design principles for chevron-braced frame systems, highlighting critical design considerations, common failure mechanisms, and advancements in analytical and experimental studies. A number of equations have been developed to co-relate among the relative strength of the braces with respect to the lateral strength of the braced bent (β0), the relative strength of the braces with respect to the beam (r0), and the strength of the beam intersecting braces with respect to the braces (K) which also presented in plots to help the designer efficiently. By understanding the strengths and limitations of CBF systems, engineers can develop more resilient and reliable structures capable of withstanding the demands of seismic loading.