Other Buckling Restrained Brace (BRB) Systems

Due to the economy they offer, BRB and BRBF have seen increased use in recent years. Several companies have tested and developed their own proprietary systems. One of these companies established in 2002 is CoreBrace, LLC that commenced research and development of their Buckling-Restrained braces in February of 2001. In October of 2001, the first series of half scale BRB specimens were successfully tested per the AISC/SEAOC Recommended Provisions for Buckling Restrained Braced Frames (Provisions) at the University of Utah. From spring to fall of 2002, two more series of specimens were tested at the University of Utah for brace sizes ranging from 65 to 340 kips. All of these test specimens exceeded the Provisions by large margins. The company has tested some of the largest BRBs to date. The photo below shows a construction site where CoreBrace BRBs with square steel casing are used.

PileMedic SuperLaminate

Andrew Hinchman, Tsai et al. and Martinovic et al offer new ways of constructing BRB frames. Peter Dusicka of Portland State University has introduced a lightweight Aluminum BRB which is wrapped with FRP. Among the advantages of his invention is the light weight and non-corroding nature of both aluminum and FRP. Among the limitations of his invention is the higher cost of aluminum and the fact that the product can be used only in new construction; it does not offer any solution for millions of existing buildings that require seismic upgrade.