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.

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The historic Franklin Avenue Bridge in Minneapolis, Minn., was built in 1923 and rehabilitated in 1970. The 1050-ft-long, five-span, open- spandrel concrete deck arch structure has served as a vital link over the Mississippi River for nearly 100 years, c o n n e c t i n g M i n n e a p o l i s a n d S t . Paul neighborhoods. Degradation and changing usage led to the full replacement of the deck and spandrel cap beams during the summer of 2016. By coupling accelerated bridge construction (ABC) techniques with prefabricated bridge elements and systems (PBES), the replacement of the superstructure was completed during a 116-day closure. Inspection of the existing bridge r e v e a l e d m a n y e l e m e n t s w e r e deteriorated and laden with chlorides. T h e o r i g i n a l p i e r, a rc h r i b , a n d abutment deterioration consisted of spalls, delaminations, and longitudinal reflective cracks along the top and bottom of the arch ribs in line with the Melan truss elements. The majority of the deterioration was caused by chloride intrusion and freeze-thaw damage. In addition, the as-inspected operating rating of the arch ribs of span 1 and span 5 was 0.63 (below 1.0); therefore, the bridge was load-posted to 18 tons profile FRANKLIN AVENUE BRIDGE / MINNEAPOLIS, MINNESOTA BRIDGE DESIGN ENGINEER FOR REHABILITATION: HNTB Corporation, Golden Valley, Minn. SPECIALITY CONSULTANT: Wiss, Janney, Elstner Associates Inc., Northbrook, Ill. PRIME CONTRACTOR: Kraemer North America, Burnsville, Minn. PRECASTERS: Precast concrete deck panels: Kraemer North America, Burnsville, Minn.; precast concrete cap beams: Forterra Building Products, Elk River, Minn.—a PCI-certified producer; precast concrete ornamental railing panels: American Artstone, New Ulm, Minn. OTHER MATERIAL SUPPLIERS: Stainless steel plates: Ryerson, Minneapolis, Minn.; PTFE sheets: D.S. Brown Company, North Baltimore, Ohio; expansion joints: Commercial Fabricators, Bridge View, Ill.; DUCTAL concrete (UHPC): Lafarge North America, Chicago, Ill.; premixed polyester polymer concrete (PPC): KWIK BOND, Benicia, Calif. by Dan Enser, HNTB Corporation; Arne Johnson and Dr. John Lawler, Wiss, Janney, Elstner Associates Inc.; and Paul Backer, Hennepin County FRANKLIN AVENUE BRIDGE ANALYSIS, DESIGN, AND ACCELERATED BRIDGE CONSTRUCTION New (2016) typical cross section (top) and existing (1970) typical cross section (bottom). All Figures and Photos: HNTB Corporation. 24 | ASPIRE Summer 2017 P R O J E C T

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