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This 3D-printed pedestrian steel bridge concept has won the 2021 Forge Prize By Alexander Walter| Monday, Apr 5, 2021 Forge Prize 2021 winner: Hunter Ruthrauff and his design for a pedestrian bridge in San Diego s Balboa Park. All images courtesy of Forge Prize/AISC. The latest Forge Prize goes to an innovative concept for a 3D-printed pedestrian steel bridge by Hunter Ruthrauff of T.Y. Lin International Group in San Diego. Established by the American Institute of Steel Construction in 2018, the annual competition invites emerging architects to propose boundary-pushing steel structures. Image courtesy of Forge Prize/AISC Ruthrauff s winning bridge concept is conceived for a site in San Diego s Balboa Park, seeking to reflect the network of trails in Florida Canyon through its organic form. According to the designer, 3D-printed steel was chosen due to its better tensile strength than 3D-printed concrete and the reduced complexity of t ....