ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/697527
Well known for the steel bridges it has designed since its founding in 1893, Modjeski and Masters (M&M) had gained less attention for its advancements with concrete designs. That work is now coming to the fore thanks to innovative concrete designs and its acquisition in 2015 of Summit Engineering Group, which specializes in segmental and spliced-girder concrete designs. "The bridge industry typically views the firm's specialty as being one of designing, rehabilitating, and inspecting complex steel structures," explains Michael F. Britt, senior vice president and director of business development for the Mechanicsburg, Pa.-based firm. "While our project portfolio is dominated by being the designer of record for numerous steel bridges, M&M has also developed innovative concrete designs that have introduced n e w c o n c re t e b r i d g e t e c h n o l o g y for new and rehabilitated bridges throughout the nation." " We ' v e b e e n t h e q u i e t c o m p a n y when it comes to talking about our a c c o m p l i s h m e n t s w i t h c o n c r e t e bridges," says Barney T. Martin Jr., president/CEO. "In fact, throughout our history, there have been years when we designed more square feet of concrete bridges than steel." Precast Concrete Deck Panels Grow One key area where the firm has innovated has been with precast concrete deck panels, which it first used in 1980 on the Bayview Bridge over the Mississippi River at Quincy, Ill. A key driver for its design was the need to complete the work in 18 months. The project became the first cable-stayed bridge in the country to feature precast, post-tensioned concrete deck panels. "The end result was a more evolved and robust structure," says Britt. More recently, the firm used precast concrete panels to replace the existing reinforced concrete deck and railing in approach spans on the Ambassador Bridge connecting Detroit, Mich., with Windsor, Ontario, Canada. At one time the longest suspension bridge in the world, it now has precast concrete panels in the 5600-ft-long approach spans of the 7500-ft-long structure. 'We expect precast concrete deck panels will be used more often in the future.' "We expect precast concrete deck panels will be used more often in F O C U S THE QUIET COMPANY Modjeski and Masters builds its expertise with concrete bridges through continuing innovations and making its first acquisition in 123 years by Craig A. Shutt The Bronco Bridge in Denver, Colo., a 371-ft-long, three-span, rigid-frame bridge, features spliced precast, pretensioned and post-tensioned concrete U-girders, as well as precast concrete curved piers, integral abutments, and precast concrete deck panels. All Photos: Modjeski and Masters. 6 | ASPIRE Summer 2016