Western Bridge Engineers’ Seminar PRACTICAL SOLUTIONS TO BRIDGE ENGINEERING CHALLENGES Peppermill Hotel Reno, Nevada Seminar managed by: cm.wsu.edu/wbes 800-942-4978 1 K1 KEYNOTE I-74 Mississippi River Bridge: A State of the Art Design Norman McDonald • Iowa Department of Transportation The existing I-74 Mississippi River Bridge connecting Bettendorf, Iowa with Moline, Illinois is a vital component of the transportation corridor in the Quad Cities. The twin suspension bridges, a national historic landmark, will be replaced with dual 795’ Steel Basket Handle True Arch bridges consisting of a total of twelve vehicular traffic lanes (eight lanes and four full size shoulders) and a bicycle/pedestrian trail. The new arch bridges will provide the high degree of elegance that was desired by the community. The design team tackled complex arch design issues such as buckling behavior of the minimally braced arch rib, evaluation of dynamic wind loads, mitigation of wind vibration affects, and a detailed construction analysis of both arch spans. The bicycle/pedestrian trail will be asymmetrically cantilevered off the eastbound arch bridge before converging into a monolithic bridge deck on the girder approach spans. A structural health monitoring system (SHM) will monitor corrosion, load distribution, and movements. Motorized travelers and an extensive walkway system will provide easy access for inspection and maintenance. In addition to the basket handle arch, other aesthetic features will include an overlook on the arch bicycle/pedestrian trail with a glass oculus, eccentrically intertwined Y-shaped pier columns, and special LED lighting. In this paper the authors will discuss the unique design challenges and features of the signature structure, highlighted above, such as the arch state-of-the art structural design and analysis, the SHM system, the built-in inspection and maintenance system, and the aesthetic features. 2A ACCELERATED BRIDGE CONSTRUCTION Utah SR-201 Bridge Slide Richard Hansen • Michael Baker International The SR-201 over KCC Arthur Mill Railroad project included many design constraints that complicated this bridge slide project. The existing three-span superstructures were replaced with single span superstructures. The existing bents were used as new abutments with new MSE walls constructed behind the existing bents, under the existing end spans. Other complexities included the 61 degree skew, semi-integral abutments supported on seismic isolation bearings, and horizontal/vertical clearance issues during construction due to railroad track alignment and profile. This presentation will cover the design and construction challenges and how the project team successfully navigated these challenges. ABC Methods for Bridge Replacement on SH-55, North of Cascade (ID) Leonard Ruminski • Idaho Transportation Department SH-55 is a two-lane major scenic route connecting Boise with US-95 to the North at New Meadows. Both highways provide the only routes contained entirely within the state for carrying commercial and tourist traffic between northern and the southern Idaho. Cascade is a small resort town located 75 miles north of Boise on SH-55. The existing 65 year old, three-span steel girder bridge crossing North Fork Payette River just north of Cascade has been determined as structurally deficient and therefore originally scheduled for replacement in 2017. However recent underwater inspections revealed that exposed steel piles supporting the existing bridge piers through 20-foot river depths are heavily corroded with as much as 50% section loss. The subsequent substructure bridge analysis proved that the deteriorated piles
PRACTICAL SOLUTIONS TO BRIDGE ENGINEERING CHALLENGES
Jun 16, 2023
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