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
Different retaining wall types were evaluated for the support of the raised roadways. The anticipated high seismic activities and ground settlements required a special design for the retaining wall at this site. Presence of high ground water made the stabilization of the soil at the site for construction of a footing nearly impossible. A mechanically stabilized earth (MSE) wall system was selected as the most feasible type of construction. Aesthetic Features In order to capture the beauty of the surrounding area, with the river co-existing with the ocean, the beauty of the beach community, and the recreational characteristic of the site, the City of Oceanside sought the services of a landscape architect for creating the images and architectural treatments that were used on the retaining walls. Open barrier railings were used at the edges of the bridge deck to maximize the driver's view while travelling on the bridge. __________ Roya Golchoobian is senior bridge engineer and project manager with T.Y. Lin International, San Diego, Calif. The bridge is located in the seismically active area of Southern California. The Pacific Street Bridge in Oceanside, Calif., incorporates a unique S-curve and open barrier rail. Construction of the open barrier that permits views of the San Luis Rey River. The Pacific Street Bridge's box girder depth varies from 6 ft 3 in. to 8 ft 6 in. For more information on this or other projects, visit www.aspirebridge.org. A E S T H E T I C S C O M M E N T A R Y by Frederick Gottemoeller At frst glance a project like the Pacifc Street Bridge looks deceptively easy. After all, the spans are short, the bridge is low to the water, and it's not that big a body of water in the frst place. Who is really going to care what the bridge looks like? Luckily, this de- signer cared, and realized that all of the residents in the condos around the bridge would care, too. Using cast-in-place post-tensioned concrete allowed the superstructure to be rela- tively thin, and also allowed the wide overhangs that make it appear even thinner. The pier caps are invisible, hidden within the superstructure. Only two columns are required at each pier line. Most of the space between the water and the roadway is left open, and the natural refectivity of the superstructure allows light to carry through the structure. Rather than creating a dark slit just above the water, visually cutting the lake in two, the bridge reveals the water surface beyond the bridge, keeping the lagoon visually intact. Finally, the superstructure seamlessly follows the geometry of the roadway, with no special brackets or offsets. The bridge seems to foat effortlessly from shore to shore. If the "bones" of a structure are as successful as this one, very little additional detail or ornamentation is needed. Knowing this, the designer has left the piers as simple cylinders, and made the railing transparent without adding complication. All in all, it's a very nice bridge to come home to. Pacific Street Bridge_spr10-1.indd 36 4/30/14 11:15 AM