City of Everett Seismic Assessment

City of Everett Public Works | Everett, WA

  • Client
  • City of Everett Public Works
  • Location
  • Everett, WA

Project Overview

In 2013, the City of Everett Public Works department hired OAC to carry out a detailed seismic assessment of two existing buildings on their campus: Building 1, a 40-year old concrete tilt-up building housing Public Works and the Everett Building Department, and Building 4, a 25 year-old pre-fabricated steel building housing shops, maintenance equipment and vehicles. Building 1 was known to have notable deterioration to its exterior concrete walls.

Prior seismic screening by another consultant identified a substantial list of seismic deficiencies at Buildings 1 and 4. Due to the construction type and vintage, a list of unknowns related to the composition of both structures was generated. OAC’s role was to carry out the next phase of Seismic Assessment – which was comprised of a Tier 2 ASCE 3103 Seismic Evaluation and a preliminary cost estimating, as the City was interested in comparing estimated costs for replacement to estimated costs for upgrade.

In order to “fill in the blanks” and piece together information necessary to calculate seismic capacities, OAC first carried out a detailed investigation of both structures. The investigation consisted of careful visual documentation and destructive testing. Destructive testing was used to identify component type, size and connections for existing lateral force resisting elements such as roof diaphragms, concrete wall anchorage, tension bracing and moment frames.

Following the investigation, our structural engineers performed structural calculations per ASCE 3103 to generate a detailed preliminary scope of remediation for each building. OAC’s construction management department assisted by providing ROM costs for the remediation scope, as well as for replacing each building with a new facility. Replacement costs included considerations of equipment movement, storage, personnel relocation and rent. The information is currently being studied by the City of Everett to facilitate planning regarding these structures and the greater campus.

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