Jack London Square Boardwalk

Oakland, CA

Completion

2012
Jack London Square Boardwalk
Jack London Square Boardwalk
Jack London Square Boardwalk

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.

 

Scope | Solutions

 

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