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Steel Special #Concentric Braced Frame (SCBF)
Advantages
1-Lower drift values may limit damage to finishes and #nonstructural #components
2- More #economical in material, #fabrication, and erection
3- R = 6, resulting in lower design forces than OCBF’s for collectors, diaphragms and foundation #elements.
4- Allowable in all Seismic Design Categories.
5- Higher allowable height limits in Seismic Design Category D and E than ordinary concentric braced frames.
6- More #reliable yielding and buckling modes of #response than OCBF’s
Disadvantages
1- Reduced #flexibility in floor layout compared to #moment frames and eccentrically braced frames.
2- Lower height limits than moment frames.
3- Global brace #buckling and their effects on finishes Limits
4- 160 Feet in Seismic Design Category D and E, 100 feet in Category F.
History and Performance in Past Earthquakes
-No #information currently available from past #earthquakes.
-In use since the late 1990’s
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