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doi:10.3850/9789628014194_0011
Application of Buckling-Restrained Braces in Steel Frameworks Against Earthquakes
Guo-Qiang Lia, Fei-Fei Sunb, Su-Wen Chenc and Xiao-Kang Guod
College of Civil Engineering, Tongji University, 1239 Siping Road,
Shanghai, 200092, China.
agqli@ tongji.edu.cn
bffsun@ tongji.edu.cn
cswchen@ tongji.edu.cn
dtjugxk@163.com
ABSTRACT
Buckling restrained brace (BRB) has been rapidly and widely accepted by scientific and engineering community worldwide, due to its excellent seismic performance. Two TJ-type BRBs were newly developed at Tongji University. TJI-type was designed for small tonnage applications while TJII-type for large tonnage ones. Full scale cyclic test results demonstrated stable hysteretic behavior and substantial energy dissipation capacity of the BRBs. The application of TJ-type BRBs in moment frames was compared with that of ordinary braces in concentrically braced frames (CBF) by means of detailed investigation on a typical building of 8 stories. Nonlinear time history analysis showed that BRB frame can perform better than CBF, under design and rare earthquake. As an alternative application of BRBs, the structural system of simple-connected steel frame with buckling restrained braces was proposed for multi-story buildings. By static and time-history analysis, the seismic behavior of this system was investigated. The results showed that this system had energy-dissipation behavior as good as steel moment frame. The elasto-plastic behavior of this system was also verified by shaking table test.
Keywords: Buckling restrained braces, Buckling restrained brace frame, Concentrically braced frame, Seismic behavior, Simple-connected steel frame.
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