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buckling restrained brace
A buckling restrained brace (BRB) is a structural brace in a building, designed to allow the building to withstand cyclical lateral loadings, typically earthquake-induced loading. It consists of a slender steel core, a concrete casing designed to continuously support the core and prevent buckling under axial compression, and an interface region that prevents undesired interactions between the two. Braced frames that use BRBs - known as Buckling Restrained Braced Frames, or BRBFs - have significant advantages over typical braced frames.〔"BRBF have more ductility and energy absorption than SCBF because overall brace buckling, and its associated strength degradation, is precluded at forces and deformations corresponding to the design story drift." ''ANSI/AISC 341-10 - Seismic Provisions for Structural Steel Buildings'' 2010 ed. pg. 9.1-249. Available at https://www.aisc.org/WorkArea/showcontent.aspx?id=29248. Accessed 07-21-2015.〕
==History==
The concept of BRBs was developed in Japan by Nippon Steel at the end of the 1980s〔Black, C., Makris, N., and Aiken, I. Component Testing, Stability Analysis and Characterization of Buckling-Restrained Unbonded Braces. September 2002. Available at http://peer.berkeley.edu/publications/peer_reports/reports_2002/0208.pdf. Accessed 07-21-2015.〕 and was known by its trademark name of Unbonded Brace. It was first installed in the United States in 1999, in the Plant & Environmental Sciences Building in U.C. Davis.〔Unbonded Brace Facts, n.d. http://www.unbondedbrace.com/facts.htm. Accessed 07-21-2015〕 In 2002, both CoreBrace LLC and Star Seismic LLC were incorporated,〔CoreBrace, About Us. http://www.corebrace.com/about.html. Accessed 07/21/2015.〕〔Fullmer, Brad, "Trends in Steel: BRBF Systems becoming more popular in seismic areas." Intermountain Contractor magazine, Sept. 2007, pg. 42. Available at http://www.starseismic.net/wp-content/uploads/2013/08/trends_in_Steel.pdf. Accessed 07/21/2015.〕 and began competition with Nippon in the BRB design market. BRB usage is currently accepted, with its design regulated in current standards, throughout the world.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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