NYA is serving as Structural Engineer of Record for the UCSF Health Helen Diller Hospital, a new acute care hospital tower located at the UCSF Parnassus Heights campus in San Francisco, California.

The project includes a 15-story hospital tower with one full basement level and one partial basement level, constructed on a highly constrained urban site bound by Parnassus Avenue, Medical Center Way, and the existing Moffitt and Long Hospitals. Architectural and site constraints resulted in a structure with complex geometry and an extensive system of cantilevers that extend the building perimeter beyond the primary column lines.

The tower is located adjacent to the existing hospitals but is seismically independent, with flexible connections allowing functional connectivity between the buildings. The lateral force-resisting system consists of a Special Steel Moment Frame utilizing SidePlate™ connections, supplemented with fluid viscous dampers distributed throughout the plan to meet architectural and program requirements.

NYA performed nonlinear analysis and performance-based seismic design (PBSD) to validate the structural system, ensuring the demanding performance required for a California hospital and essential healthcare facility in a high seismic region. Slated to open in 2030, UCSF Health Helen Diller Hospital sets a new standard for innovative seismic design in healthcare.

Structural Engineering Services: Structural Engineer of Record, performance-based seismic design (PBSD), Special Steel Moment Frames with SidePlate™ connections, fluid viscous dampers, nonlinear seismic analysis, hospital tower structural systems.

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