| Building Type: |
Institutional |
| Original Structure Type: |
Concrete |
| Retrofit System Type: |
Steel |
| Year of Retrofit: |
2001 |
| Uploaded by: |
Private |
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Hildebrand Hall
The original structural system of Hildebrand Hall, originally built in 1966, consisted of pre-stressed nonductile concrete floor slab and columns without any adequate earthquake resisting elements. A 1997 engineering study also showed that the interior columns as well as the library mezzanine could collapse and the building’s precast wall panels’ connections could fail during an earthquake. To strengthen the seismic performance of the building, a new lateral resisting system was added to the building. This new system consists of unbonded braces (also called buckling restrained braces) in the north and south ends of the building and new concrete shear walls on the east and west ends of the building. The unbonded braces are made from a steel brace element encased by concrete so they are strong in both compression and tension during lateral motion. For the Hildebrand Hall retrofit, the unbonded braces are arranged in concentric pairs and are located on the exterior of the building. To prevent the failures predicted in the 1997 analysis, strengthening was also completed for the walls around the stair, columns-to-slab connections, and the precast panel hangers.
This University of California Berkeley building was retrofitted as a part of the SAFER Program (Seismic Action for Facilities Enhancement & Renewal) which systematically reviewed, prioritized, and constructed building retrofits for all UC Berkeley owned and operated buildings.
Retrofit Engineer: Forell/Elsesser Engineers
Retrofit Architect: Anshen and Allen
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