Helix Pedestrian Bridge

Dynamic Structures was responsible for detailing, fabricating and erecting the steel superstructure of a unique "Helix"-shaped pedestrian overpass in Seattle for the world's largest biotechnology company, AMGEN . This bridge spanned 400 feet and featured an architectural design consisting of three shallow arches configured to evoke the shape of a helical DNA molecule. This structural scheme required the use of extensive temporary support to the arches during erection.