Beauty that carries the load

Leslie McManus

Challenge

A landmark pedestrian bridge posed unique needs: a primary structural material that could deliver both enormous strength and longevity in a marine environment.

Solution

Forta, Outokumpu’s high-strength duplex stainless steel, was the designers’ recommendation for uncommon strength and exceptional corrosion resistance.

Delivery

Steel grade: Outokumpu Forta DX 2205

Opened in 2011, the Harbor Drive Pedestrian Bridge spans 168 meters, giving pedestrians safe passage over a busy thoroughfare, rail yard and trolley tracks. Part of the 3.2-kilometer Park-to-Bay Link, the bridge symbolizes San Diego’s nautical heritage while serving as the new southern gateway to the downtown area.

The graceful, single-cable self-anchored suspension bridge features a 40-meter pylon inclined at a dramatic, 60-degree angle over the bridge deck, which is suspended over just one side. The bridge’s streamlined design is a departure from the bulky suspender and main cables typical of traditional suspension bridges. Here, smooth, uninterrupted lines created by innovative design completely hide the large main cable.

 

Unique structural requirements

Designed by Safdie Rabines Architects, the Harbor Drive Bridge has a uniquely transparent profile. A 6-meter-wide deck is supported by 34 individual suspenders attached to the main cable.

The main cable, which is carried in a stainless steel welded pipe fabricated from Outokumpu plate, supports the bridge deck via tension cables through the pipe and heavy plate railing posts. The railing posts do double duty, alternately supporting the concrete deck and transferring radial force from the top of the railing to the deck.

Structural engineers T.Y. Lin International chose Outokumpu’s exceptionally strong duplex stainless steel, Forta DX 2205, for the custom-fabricated posts and the welded pipe.

 

Designed for sustainability

Corrosion resistance is essential for a bridge in a marine environment, particularly one marked by regular salt fog and infrequent heavy rain. Acknowledging its superior properties, the project’s designers chose stainless steel rather than painted steel, gaining long life with minimal maintenance.

For pedestrians, the Harbor Drive Bridge offers a unique opportunity to experience timeless design. The use of stainless steel as both a primary structural material and one delivering enduring beauty makes this an iconic landmark.

Recommended products and insight

Supra

The Supra range contains stainless steel products designed for highly corrosive environments. Outokumpu Supra range stainless steels have a good resistance to uniform corrosion in many organic and inorganic chemicals. The addition of molybdenum enhances the alloy’s corrosion resistance in many acidic environments.

Cold rolled coil, strip and sheet

Available for use in a wide variety of applications, Outokumpu cold rolled coil, strip and sheet products are put to work across all industries and markets. 

Tornio, Finland

Outokumpu’s Tornio operations is the most integrated stainless steel plant in the world. State-of-the-art technology, sophisticated equipment and unrivaled expertise produce outstanding quality year after year.

Sheffield CPSC, UK

Located near the site where stainless steel was invented in 1913, Outokumpu Stainless Distribution (OSD) continues that innovation today as the premier stainless steel coil and plate service center in the U.K.

Sustainability

Outokumpu's four value propositions: recycling maximized, nothing to hide, pays for itself and indispensability showcase Outokumpu's strengths, which answer to key sustainability needs. By selecting Outokumpu's stainless steel, our customers also benefit from these in their own sustainability efforts.

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