Seismic Upgrade First

摘要

Needing to expand its library, San Francisco State University (SFSLJ) first had to have a seismic upgrade of the existing six concrete levels of the J. Paul Leonard Library and the Sutro Library before the addition of five floors of new concrete. Unbuildable for years due to budget and constructability issues, in 2008 SFSU turned to Barnhart Balfour Beatty to execute a design-build delivery. One of the largest unknowns on the project was the ability to resist seismic events to the structure, which received additions in phases over three decades since its original construction 55 years ago.