This article reviews the design and reconstruction of the Capitol Boulevard Bridge over I-5 in Olympia, Washington. The existing superstructure was retained, and a new arch supporting system was designed to replace the existing concrete piers as part of a $130,000,000 Interstate widening project. The paper describes the structure types studied, the external peer review comparing the constructibility of the concrete and steel alternatives, and the influence of aesthetics on the selection of the final structure type, two steel arches. The design of the tieback wall system, spread footing, elliptical twin-cell box arches, and load transfer by jacking is also described. The cost of the reconstruction was $3,900,000, including $1,600,000 for the tieback retaining wall system.
Samenvatting