Winthrop, MA
MWRA Deer Island Wastewater Treatment Plant, Egg-Shaped Digesters
Scope/Solutions
The Deer Island Wastewater Treatment Plant, which is owned and operated by Massachusetts Water Resources Authority, removes pollutants from wastewater that originates in homes and businesses in the greater Boston area. Buchart-Horn, the Electric Boat Division (EBDiv) of General Dynamics, and Perini retained SGH to develop the seismic design for egg-shaped digester tanks and their supporting concrete structures.
SGH helped develop the seismic design for the eight 3-MG egg-shaped digesters and two 3-MG gas storage tanks. Highlights of our analyses include the following:
- Evaluated the structures of the digesters and storage tanks
- Designed the reinforced concrete ring walls that support the digesters and gas storage steel tanks, which included an innovative concept for the anchorage of the steel tank base plate to the ring wall used to transmit the large overturning moment.
- Performed finite element analyses that included fluid-structure interaction for horizontal and vertical ground motion
- Determined stresses in the tank wall from the impulsive components
- Computed the convective components of liquid accelerating within the steel shell
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Project Summary
1996
Completion Date
Solutions
New Construction
Services
Structures | Advanced Analysis
Markets
Infrastructure & Transportation
Client(s)
Buchart-Horn | General Dynamics
Specialized Capabilities
Seismic Engineering | Computational Mechanics
Key team members
Additional Projects
Northeast
Norwottuck Trail Pedestrian Bridge
SGH investigated the bridge’s condition and designed a replacement structure.
Northeast
Massachusetts Department of Transportation, Callahan Tunnel Vent Buildings
The Massachusetts Department of Transportation (MassDOT) owns several buildings housing large air exchangers to ventilate the Callahan Tunnel that connects East Boston and downtown. SGH served as the structural engineer of record for the assessment and restoration project to address the distressed m