Innovative retrofit of a historic 100+ year old building on a steep slope in San Francisco.
IDA designed a seismic retrofit following ASCE 41-17 Tier 1 and Tier 2 Studies for this 10-story plus basement structure on a sloping lot in San Francisco. The building was constructed 100 years ago with cast in place concrete slabs, columns and walls. IDA designed a combination concrete shear wall and Fiber-reinforced polymer (FRP) retrofit to increase both shear and overturning capacity for the building without infringing on interior spaces. Micropiles were utilized to support new foundations, most of which were raised above the basement slab in unoccupied basement areas to minimize excavation and shoring.
The project was an occupied rehabilitation of the building, also known as the Granada Hotel, providing 200 affordable units.
