|Vertical Load Carrying System
|Concrete slabs on steel frames with masonry infill walls. Steel dome is supported by steel columns which are supported by dome support towers at the corners of the rotunda.
|Lateral Force Resisting System
|Original building had steel frames infilled with unreinforced brick masonry and hollow clay tiles. Building was retrofitted by strengthening the superstructure with concrete shear walls and adding base isolators.
|In original building, steel columns were supported by isolated spread foodings. During the retrofit, the footings were tied together by concrete grade beams.
|The building suffered damage during the 1989 Loma Prieta earthquake and was strengthened in 1997-98.