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First Building to Receive a USRC Rating - Roseville City Hall Annex
Hybrid Moment Frame Building Earns USRC Platinum Rating
Building to Receive a USRC Rating - Roseville City Hall Annex
The Roseville City Hall Annex is first in many ways. Not
only is it the first building rated by the USRC but it also received the USRC's
highest Platinum Earthquake Rating. Furthermore, it is the first precast
building built for the city of Roseville. The project structural engineering
firm Buehler and Buehler Structural Engineers is a founding member of the USRC
and Clark Pacific, the design-build supplier of the structural and
architectural precast, is a USRC sustaining member.
The City of Roseville had outgrown its city hall building
and because of a lease signed with Sierra College to begin classes in January
2017, city planners had only 12 months to design, program, build and prep the
building for occupancy. Other building systems had been explored, including
steel and cast-in-place concrete, but the Precast Hybrid Moment Frame system
was decided on because it gave the architect design flexibility for this
prominent building that sits in the Roseville City Square. Also, the 4-story office building houses
critical operations for the city and in the case of an earthquake city
officials needed the reassurance that these mission critical services would be
housed in a safe, resilient structure. The design achieved these goals by
obtaining USRC 5-star ratings in Safety, Damage and Recovery.
The level of performance associated with the USRC Platinum
Rating is not something that every building can achieve, but this project met
that high standard because of the following features and conditions:
- What may appear to simply be an elegant
architectural facade actually doubles as an extremely regular and redundant
structural system providing enhanced yet economical performance.
- The structural system incorporates a
high-performance precast hybrid moment-resisting frame that limited design
level drifts to less than 1.25% and is designed to be self-centering after the
design seismic event therefore eliminating residual drifts, limiting damage,
and providing for reduced recovery time.
- Roseville, and
the greater Sacramento region, has a moderately high seismic hazard
(compared to the "high" or "extremely high" hazard in much
of the rest of California) which provides opportunities to achieve high seismic
performance with only a nominal, if any, increase in construction cost.
Link to a video for construction details and attribution of
the project team: https://www.youtube.com/watch?v=eOr6Q301zbk