THE CONCRETE BRIDGE MAGAZINE

WINTER 2010

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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At the top of the arch, the No. 14 reinforcing bars were spliced together to make the arch segments continuous. Then the arches were connected through the crown cross beam. Officials agreed that replacing the existing 1940s-era reinforced concrete, deck-girder bridge on Highway 101 in Newport, Ore., required sensitivity due to its popular and scenic context. But the suggested precast concrete, post-tensioned deck- arch replacement had to overcome a series of constraints that included poor soil conditions with potential liquefaction during an earthquake. To accomplish the goals, a unique foundation system was created that resists horizontal reactions from the arch ribs. The original three-span bridge had suffered from severe deterioration, corrosion, and age. Replacing it with a durable design that was aesthetically pleasing was required because of its location adjacent to the Beverly Beach State Park, one of the most popular state parks in Oregon. The highway also serves as the major north-south route along the Oregon Coast and has been designated as a National Scenic Byway and an All- American Road. Aesthetics, functionality, and durability had to blend seamlessly on this high-profile project. After several years of studies by the Oregon Department of Transportation (ODOT) to consider alternative routes and bridge appearances, a concrete deck-arch bridge was selected as the best way to provide an aesthetic gateway from the park to the beach. This required shifting profile SPENCER CREEK BRIDGE / NEWPORT, OREGON STRUCTURAL ENGINEER: H.W. Lochner Inc., Salem, Ore. ROADWAY, HYDRAULICS, AND ENVIRONMENTAL ENGINEER: Oregon Department of Transportation GEOTECHNICAL ENGINEER: Shannon & Wilson Inc., Lake Oswego, Ore. PRIME CONTRACTOR: Slayden Construction Group, Stayton, Ore. PRECASTER: Knife River Corp., Harrisburg, Ore., a PCI-certified producer Spencer Creek Bridge on Oregon's scenic Coastal Highway 101 suits its setting CREATING AN AESTHETIC GATEWAY by Tanarat Potisuk, H.W. Lochner Inc. and Keith Kaufman, Knife River Corp. At the top of the arch, the No. 14 16 | ASPIRE , Winter 2010 P R O J E C T ASPIRE_Winter10.indb 16 12/18/09 2:17:16 PM

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