Portland, OR

Natgun Water Storage Tanks

Scope/Solutions

DN Tanks (formerly Natgun) designs and constructs prestressed concrete liquid storage tanks. The tanks are American Water Works Association (AWWA) D110 prestressed wire-wound concrete tanks that incorporate precast concrete panels. SGH developed a seismic design procedure for the domes and peer reviewed the tank designs. We used the procedure to design a number of tanks constructed in high seismic regions.

SGH provided the following services:

  • Reviewed seismic designs for prestressed concrete tanks
  • Assessed compliance to governing codes, including the California Building Code, American Society of Civil Engineers’ Minimum Design Loads For Buildings and Other Structures (ASCE 7), AWWA D110, American Concrete Institute 350.3, and the International Building Code
  • Developed a procedure for designing precast and cast-in-place concrete domes for use in high seismic areas
  • Evaluated the new procedure by performing detailed finite element analyses
  • Conducted laboratory testing of a cored wall to assess the bond strength of the steel diaphragm within the composite wall cross-section
  • Applied the procedure to the seismic design of several tanks

Project Summary

Icon: completion-date

2012

Completion Date
Solutions
New Construction
Services
Structures | Advanced Analysis | Applied Science & Research
Markets
Infrastructure & Transportation
Client(s)
DN Tanks
Specialized Capabilities
Seismic Engineering | Computational Mechanics | Physical Testing

Key team members

Mehdi Zarghamee
Consulting Principal
781.907.9203 mszarghamee@sgh.com
David McCormick
Senior Principal
415.343.3032 dlmccormick@sgh.com
Dominic Kelly
Senior Principal
781.907.9361 djkelly@sgh.com

Additional Projects

West

Jack London Square Boardwalk

After leasing a section of the boardwalk from the Port of Oakland, the developer wanted to assess the condition of a portion of the boardwalk. SGH was the prime and structural engineer for the assessment.
Explore
West

Central Arizona Project

SGH evaluated the failure risk resulting from the loss of prestress, determined pipe repair priorities, and subsequently designed post-tensioning repairs and safe excavation for the repair pipe.
Explore
See All Projects