Oakland, CA
Jack London Square Boardwalk
Scope/Solutions
The boardwalk along Oakland Estuary is a central attraction of the Jack London Square entertainment and business area. 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 and subsequently developed a rehabilitation program for the Area 8 walkway that is cantilevered from the side of the concrete pier and supports Scott’s Seafood restaurant.
Our investigation included a survey of the boardwalk on foot and by boat. We observed and concluded that:
- The plank condition created a walking hazard due to warping, shrinkage, loose nails, and large gaps
- Cantilevered steel tube beams exhibited corrosion and section loss
- Spalls and cracks in supporting cast-in-place concrete beams and precast concrete piers was attributed to reinforcement corrosion due to chloride contamination
We developed a rehabilitation program and our work included:
- Testing of repair techniques with input from in-house materials scientists
- Specifying replacement of wood planks and joists with pressure-treated lumber
- Designing a new restraint system parallel to the boardwalk to increase seismic resistance
- Estimating extent of corrosion and evaluating the remaining beam capacity at Area 8 to support design loads
- Estimating extent of beam corrosion prior to repair of Area 8 using ultrasonic testing along with destructive testing and recommending the drainage of seawater that filled the tube beams through erection holes and sealing of beams to minimize further deterioration
- Providing order-of-magnitude and detailed cost estimates
- Reviewing contractor submittals, drawings, and specifications and performing structural observations for Area 8
Project Summary
Solutions
Repair & Rehabilitation
Services
Structures | Applied Science & Research
Markets
Infrastructure & Transportation
Client(s)
Cushman & Wakefield Inc.
Specialized Capabilities
Repair & Strengthening | Marine & Civil Works | Materials Science
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