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World leaders in the field of shock & vibration with over 60 years of industry experience. 

90. REHABILITATION OF A 1985 STEEL MOMENT FRAME BUILDING

A 1985 steel moment frame was seismically upgraded using passive energy dissipation, without adding stiffness to the system. The design and analysis techniques for sizing the Velocity Braces and their impact on the demand capacity ratios are reviewed in this paper. The original structure was built in the San Francisco Bay Area in compliance with the 1985 Uniform Building Code (UBC). The moment frame contains the classic pre-Northridge nonductile moment connection. Nonlinear time history analysis was used to design a damper system that provides a significant decrease in seismic response.

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