Colby Co.’s structural engineers performed all of the structural steel connection design for the new $300 million Liberty Mutual Office Building is in the final stages of construction. The 22-story, 590,000 square-foot building will serve as new office space for Liberty Mutual who estimates that the expansion will create 600 new full-time positions. The building was designed to meet LEED Silver certification.
Colby Co.’s structural engineers also performed all of the structural connection design for an 83′-0″ span Pedestrian Bridge that is 22′-0″ above the ground connecting the new Liberty Mutual Office expansion and an adjacent office building in Boston, MA. The bridge components included custom designed arched box girders and architecturally exposed suspension cables. We evaluated the dynamic affects of heavy pedestrian traffic as well as the consideration of wind tunnel affects between the buildings.