Techno Press

Steel and Composite Structures   Volume 1, Number 1, March 2001, pages 145-158
Effects of near fault loading and lateral bracing on the behavior of RBS moment connections
Qi-Song \"Kent\" Yu and Chia-Ming Uang(U.S.A.)

Abstract     [Full Text]
    An experimental study was conducted to evaluate the effects of loading sequence andrnlateral bracing on the behavior of reduced beam section (RBS) steel moment frame connections. Fourrnfull-scale moment connections were cyclically tested-two with a standard loading history and thernother two with a near-fault loading history. All specimens reached at least 0.03 radian of plasticrnrotation without brittle fracture of the beam flange groove welds. Two specimens tested with the nearfaultrnloading protocol reached at least 0.05 radian of plastic rotation, and both experienced smallerrnbuckling amplitudes at comparable drift levels. Energy dissipation capacities were insensitive to therntypes of loading protocol used. Adding a lateral bracing near the RBS region produced a higherrnplastic rotation; the strength degradation and buckling amplitude were reduced. A non-linear finiternelement analysis of a one-and-a-half-bay beam-column subassembly was also conducted to study thernsystem restraint effect. The study showed that the axial restraint of the beam could significantlyrnreduce the strength degradation and buckling amplitude at higher deformation levels.
Key Words
    Northridge earthquake; reduced beam section (RBS) moment connection; steelrnmoment connection; near-fault ground motion; loading protocol; lateral bracing, system restraint.
Qi-Song ?ent?Yu, Degenkolb Engineers, San Francisco, CA 94104, U.S.A.rnChia-Ming Uang, Department of Structural Engineering, University of California, San Diego, La Jolla, CA 92093-0085, U.S.A.

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