The two frame office towers, constructed in the 1970s per the 1967 edition of the UBC, use perimeter reinforced concrete moment frames to resist seismic loading. The buildings are rectangular in plan and have certain characteristics that adversely affect their seismic performance, in particular the presence of a soft-story response […]
Best Design Practices for Seismic Evaluation and Preservation of Historic Buildings
Two historic and distinctive building complexes, located in downtown Sacramento, were targeted for seismic evaluation and rehabilitation as part of the city’s seismic safety and downtown revitalization program. This evaluation provided a unique opportunity to examine new seismic systems and perform benefit-cost analyses. Complex 1 was originally constructed in the […]
Design and Construction of a Modern Post-tensioned Parking Structure
The parking structure on the California State University, Sacramento, campus comprises two connected six-story units, totaling approximately 1 million square feet and 3,000 stalls. Figure 1 is a recent photograph of the structure, looking east. International Parking Design was the architect of record, and Miyamoto International was the structural engineer […]
Retrofit Of Historic 3-Story Nonductile Concrete Structure Using Performance-Based Engineering And Innovative Technologies
This paper presents how performance-based engineering made possible the transformation of a deteriorated, historic 3-story automobile sales and service center into a thriving, 4-story, mixed-use development. The structural rehabilitation included 1) adding carbon fiber reinforced polymers to existing 2nd and 3rd floor concrete slabs to increase live load capacity, 2) […]
U.S. Experience – Seismic Rehabilitation Of Historic Structure With Dampers
The 145,000-sf (13,470 m2) building, built in 1910, is a torsionally nonsymmetrical structure comprised of a six-story portion adjacent to a two-story portion. The building is located in Northern California. There was significant concern that the building will not be able to withstand the level of earthquake shaking expected at […]
Design of an Essential Facility with Steel Moment Frames and Viscous Dampers Using US NEHRP Procedure
This paper presents the nonlinear seismic analysis, development, and implementation of an innovative seismic retrofit strategy for a six-story nonductile reinforced concrete 145,000-sf (13,470 m2) historic building. Dynamic and nonlinear static analytical results verified that the building had a weak soft-story with inadequate post-yield capacity, and large torsional response. The […]
Seismic Retrofit of Historic Iasi City Hall Building Using Seismic Protective Devices
Romania’s Iasi City Hall was originally constructed in the 1810’s in neo-classical Viennese style. It was modified in 1860’s and turned to the city hall in 1891. It is considered a cultural heritage building and was the Romanian Royal Family residence. The building framing is comprised of reinforced concrete floors, […]
