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/297033
W h e n o r i g i n a l l y c o n s t r u c t e d i n 1 9 5 8 , t h e e x i s t i n g s i x - l a n e P e a r l H a r b o r M e m o r i a l B r i d g e ( l o c a l l y k n o w n a s t h e Q - B r i d g e ) w a s t h e largest bridge along the Connecticut Tur npike and included the longest p l a t e g i r d e r s p a n i n t h e U n i t e d States. However, the existing bridge c u r r e n t l y s u f f e r s f r o m s t r u c t u r a l d e f i c i e n c i e s a n d c a n n o l o n g e r a c c o m m o d a t e t o d a y 's h i g h - t r a ff i c volumes of over 160,000 vehicles p e r d a y, n e a r l y f o u r t i m e s t h e volume of traffic it was originally designed to serve. As a result, a new b r i d g e w a s n e e d e d a n d p l a n n i n g f o r i t s re p l a c e m e n t w a s i n i t i a t e d by the Connecticut Department of Transportation (ConnDOT) in 1990. The new $635 million, 10-lane Pearl Harbor Memorial Bridge is the focal point of the $2.0 billion I-95 New Haven Harbor Crossing Corridor Improvement Program, one of the largest multi-modal transportation improvement initiatives in Connecticut history. In addition to the new bridge, the program includes o p e r a t i o n a l , s a f e t y, a n d c a p a c i t y improvements to 7.2 miles of I-95, reconstruction of the adjacent I-91/I-95/ Route 34 Interchange, and a new commuter rail station. A Signature Solution A context-sensitive design approach focusing on public input was employed, w h i c h i n c l u d e d a n a rc h i t e c t u r a l committee of key stakeholders. From this process, a decision was made to replace the existing bridge with a new signature bridge with a 100-year service life expectancy. The new bridge would continue to be named the Pearl Harbor Memorial Bridge, and the design team was tasked with creating a "memorial quality" structure commemorating the veterans of Pearl Harbor. The result was the final selection of a 10-lane extradosed bridge spanning New Haven Harbor. Extradosed bridges, while having an appearance similar to traditional cable- stayed bridges, behave differently and have several key distinctions. The extradosed design utilizes shorter towers and a flatter stay-cable inclination than traditional cable-stayed bridges, which results in the deck system being the primary resistance to dead and live loads. For the New Haven Harbor crossing, the extradosed bridge design allowed for increasing the main span to improve navigation and minimize environmental impacts. The limited tower heights afforded by the extradosed design avoids impacting air traffic from Tweed- New Haven airport located east of the bridge, whereas the taller towers of a traditional cable-stay bridge would have likely infringed on FAA-required flight path clearances. The design was completed with bid packages prepared for two alternatives for the main span; a three-span concrete extradosed prestressed alter native, and steel composite extradosed alternative. profile PEARL HARBOR MEMORIAL BRIDGE /NEW HAVEN, CONNECTICUT PROGRAM MANAGER: Parsons Brinkerhoff Quade & Douglas Inc., Glastonbury, Conn. BRIDGE DESIGN ENGINEER: URS, Rocky Hill, Conn., and Tampa, Fla. CONSTRUCTION ENGINEERING AND INSPECTION: H.W. Lochner Inc., New Haven, Conn. / Figg Bridge Inc., New Haven, Conn. PRIME CONTRACTOR: Cianbro/Middlesex JV III and Walsh/PCL JV II, New Haven, Conn. CONTRACTOR CONSTRUCTION ENGINEERING: McNary Bergeron & Associates, Old Saybrook, Conn. CONCRETE SUPPLIER: The Suzio York Hill Companies, New Haven, Conn. I-95 northbound traffic traveling over the extradosed cable-stayed main-span bridge, one week after opening. Photo: Walsh/PCL JV II. Pearl Harbor Memorial Bridge SIGNATURE BRIDGE REPLACES ITS AGING NAMESAKE by Roy Merritt Jr., H.W. Lochner Inc.; Wade S. Bonzon, Figg Bridge Inc.; and John S. Dunham, Connecticut Department of Transportation 30 | ASPIRE , Fall 2012 P R O J E C T AspireBook_Fall12.indb 30 9/18/12 8:58 AM