There are no outriggers or belt trusses. There are no buckling restrained braces or seismic braces of any kind. There are no dampers—tuned, sloshing or otherwise. And there are no perimeter megacolumns, diagrids or moment frames.
The structure of the tallest building in earthquake-prone San Francisco—the 1,070-ft Salesforce Tower—is plain and simple. Still, the 1.4-million-sq-ft supertower is the city’s only high-rise, without an obvious seismic system, designed to perform 25% better in a quake.