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/657823
C R E AT I V E C O N C R E T E C O N S T R U C T I O N 32 | ASPIRE Spring 2016 O n October 19, 2015, the Connecticut D e p a r t m e n t o f T r a n s p o r t a t i o n (ConnDOT) held a bridge party and ribbon c u t t i n g fo r t h e s o u t h b o u n d P e a r l H a r b o r Memorial Bridge (PHMB), the second half of the new I-95 crossing of the Quinnipiac River in New Haven, Conn. The bridge was named by the Connecticut legislature as a memorial structure to honor the more than 2500 Americans, including 17 Connecticut residents, who died in the Japanese attack on Pearl Harbor on Dec. 7, 1941. The event wa s a t t e n d e d b y m o r e t h a n 6 0 0 0 p e o p l e , including Connecticut Governor Dannel P. Malloy, U.S. Senator Richard Blumenthal, U . S . R e p r e s e n t a t i v e R o s a D e L a u r o , Commissioner of Veteran Affairs Sean M. Connolly, and in the front row of the viewing area, two sur vivors of the attack on Pearl Harbor. The choice of an extradosed prestressed b r i d g e t y p e fo r t h e P H M B wa s a c r e a t i v e c o n c r e t e s o l u t i o n t o c h a l l e n g i n g s i t e c o n d i t i o n s , a n d r e p r e s e n t e d t h e f i r s t application of this new bridge type in the United States. The 515-ft-long main span w a s d e s i r a b l e f o r n a v i g a t i o n c l e a r a n c e , but structural depth was limited by profile constraints required to meet the grades tying into the adjacent interchange, and precluded a conventional girder type bridge. A nearby airport constrained tower height that would h a v e b e e n n e c e s s a r y fo r a c o n v e n t i o n a l cable-stayed bridge solution. The extradosed p r e s t r e s s e d d e s i g n a l l o w e d t h e d e s i r a b l e span, while staying within structural depth constraints and keeping the towers below the aviation clearance surface. The all-concrete design also provided a highly durable bridge solution to meet the 100-year ser vice life design requirement. The extradosed bridge type also met the f u n d a m e n t a l p r o j e c t g o a l t o p r o v i d e a s i g n a t u r e s p a n w o r t h y o f t h e m e m o r i a l character of the crossing. The towers are strong, simple, oval cylinder shapes, similar to what one might see on a ship. The outer webs of the girders are sloped to visually minimize the depth of the structure and provide a good balance between the visual mass of the girders and towers, and the superstructure is variable depth, which makes clear the girder's strong role in supporting the span. Representative DeLauro called the bridge "a work of art" and said she hoped all those who helped build Pearl Harbor Memorial Bridge by Dr. Steven L. Stroh, AECOM Bridge entry portal columns. Photos: Connecticut Department of Transportation. Completed Pearl Harbor Memorial Bridge, New Haven, Conn. The first extradosed prestressed concrete bridge in the United States. Photo: Connecticut Department of Transportation.