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/306855
Big Chickies No. 2 Bridge—more commonly known as Auction Road Bridge—is located between Rapho and Penn Townships over Chickies Creek in historic Lancaster County, Pa. It was designed in 1916 by prominent Lancaster County engineer Frank Shaw and put into service in 1922. The unique 58-ft-long, single-span, tied through- arch concrete bridge is believed to be one of only four of its kind in the commonwealth. Shaw modeled the bridge after the patented rainbow arch bridge design of James H. Marsh, only slightly changing the design by adding diagonal truss chords. Research indicates only a dozen or so of Marsh's bridges remain in the entire country. Pennsylvania has a rich heritage of historic bridges. With 200 covered bridges, it boasts more covered bridges than any other state in the country. Lancaster County is home to 29 of Pennsylvania's covered bridges—second only to Parke County, Ind., for the most covered bridges of any county in the United States. Lancaster County has done a tremendous job of maintaining their covered bridges and, in an effort to preserve them, has been reluctant to put steel or prestressed concrete beams under the timber bridges. While Auction Road Bridge is not a covered bridge, the county adopted the same philosophy for this structure's replacement, requiring that the new bridge structurally mimic the original 1916 bridge. In 2005, Lancaster County gave specific instructions early in the project to develop a context-sensitive design that captures the architectural, historical, and structural features of the National R e g i s t e r- e l i g i b l e b r i d g e . C o n t e x t - sensitive design for this structure meant incorporating the same architectural and historical details of the original tied through-arch bridge. Similar to their covered bridge restorations, the county also opposed a design incorporating steel or prestressed concrete beams profile AUCTION ROAD BRIDGE / PENN AND RAPHO TOWNSHIPS, LANCASTER COUNTY, PENNSYLVANIA BRIDGE DESIGN ENGINEER: RETTEW Associates Inc., Lancaster, Pa. AWARDS: 2008-2009 Award for Outstanding New Short Span Bridge, Association for Bridge Construction and Design, Susquehanna Chapter; 25th Annual Road and Bridge Safety Improvement Award; 2010 Diamond Award Certificate, American Council of Engineering Companies of Pennsylvania; PCI 2009 Design Award for Best Bridge (Co-winner for Spans Less than 75 Ft) by Daniel A. Rogers, RETTEW Associates Inc. Auction Road Bridge Replacement Recreating an Historic Treasure The completed Auction Road Bridge over Chickies Creek features two lanes of traffic, sufficient sight distance, and current safety features. Photos: RETTEW. Lancaster County gave specific instructions . . . to develop a context- sensitive design that captures the architectural, historical, and structural features of the existing bridge. A contributor to the project's success was effective coordination among the designer, the contractor, and the precaster. 40 | ASPIRE , Spring 2010 Auction Road_spr10-1.indd 40 4/30/14 11:21 AM