THE CONCRETE BRIDGE MAGAZINE

WINTER 2012

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/297018

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In the last week of August 2011, Hurricane Irene roared up the east coast of the United States leaving billions of dollars in property damage in its wake. Directly in its path was the ongoing construction for the new Indian River Inlet Bridge in Delaware. With this site being just yards from the Atlantic Ocean, this will not be the last such storm that the new bridge will have to withstand. In fact, bridging this inlet has proven very difficult over the years. The new bridge will be the fifth bridge constructed across the inlet in just over 60 years. The first three bridges were battered by storms and extreme tides at the site, and the current bridge built in 1965 is now in jeopardy from severe scour and erosion of the inlet bed, with some scour holes near the foundations approaching 105 ft deep. T h e D e l a w a r e D e p a r t m e n t o f Transportation (DelDOT) has continued to monitor the condition of the existing bridge closely, while construction of the new replacement bridge began in late 2008 under a design-build contract. The history of problems with extreme tides and scour of the previous bridges over the inlet led DelDOT to mandate that all piers for the new bridge had to be placed outside of the inlet. Additionally, DelDOT imposed a 900-ft horizontal clearance requirement to accommodate for the potential future widening of the profile INDIAN RIVER INLET BRIDGE / BETHANy BEACH, DELAWARE DeSIgN-buIlD TeAm: Skanska USA Civil Southeast, Virginia Beach, Va.—AECOM, Glen Allen, Va. CoNTRACToR: Skanska USA Civil Southeast, Virginia Beach, Va. bRIDge DeSIgN eNgINeeR: AECOM, Glen Allen, Va., and International Bridge Technologies Inc., San Diego, Calif. CoNSTRuCTIoN eNgINeeRINg: AECOM, Hong Kong, China (Erection Analysis) and Finley Engineering Group Inc., Tallahassee, Fla. (Falsework) CoNSTRuCTIoN eNgINeRINg INSpeCTIoN: Parson Brinckerhoff, New york, N.y. STAy CAble AND poST-TeNSIoNINg CoNTRACToR: Freyssinet USA, Sterling, Va. pReCAST CoNCReTe pRoDuCeR: Bayshore Concrete Products Corporation, Cape Charles, Va., a PCI-certified producer by Eric T. Nelson, AECOM Indian River Inlet Bridge– Surviving the Storms Cable-stayed design spans treacherous inlet with history of extreme scour Cantilever construction of the new Indian River Inlet Bridge proceeded over the inlet from both sides with form travelers. The simple, yet elegant shape of the bridge will limit its impact on the pristine coastal environment. Photo: AECOM. 12 | ASPIRE , Winter 2012 P R O J E C T Book_Win12.indb 12 12/29/11 11:12 AM

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