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/297018
An iconic pedestrian bridge now spans historic Pacific Coast Highway (PCH). It is the centerpiece of a traffic congestion relief project undertaken by the city of Dana Point, Calif. The single-span precast, prestressed concrete girder pedestrian bridge carries the heavy foot traffic over this main north-south arterial that once caused protracted traffic delays due to its long turning and through red light times required for pedestrians. In addition to enhancing traffic operations, the bridge improves pedestrian safety at a busy intersection and provides an architectural gateway for the community. Superstructure The pedestrian bridge superstructure consists of two 109-ft 2-in.-long, variable-depth precast, prestressed concrete girders with precast concrete d e c k p a n e l s a n d a c a s t - i n - p l a c e concrete deck between them to form an H-shaped cross section. Due to the right-of-way restrictions and the city's requirement to maintain full traffic operations on PCH, precast concrete girders were selected for the bridge span. This minimized the construction encroachment on traffic by eliminating the need for falsework in the roadway. The girders are 18 in. wide and vary in depth from 8 ft 0 in. at their ends to 6 ft 5½ in. at midspan. While the bottom of the girder rises 2 ft 0 in. from support to midspan in a parabolic curve, the top of the girder rises 5½ in. to remain 50 in. above the vertical curve of the deck, which also rises 5½ in. During preliminary design the engineer consulted with local precasters in order to optimize the girder design. The precasting was already complicated since all of the connection inserts, reinforcement couplers, architectural profile PACIFIC COAST HIGHWAY PEDESTRIAN BRIDGE / DANA POINT, CALIFORNIA bRIDge DeSIgN eNgINeeR: T.y. Lin International, Riverside, Calif. pRIme CoNTRACToR: Excel Paving Company, Long Beach, Calif. pRojeCT eNgINeeR: Psomas, Santa Ana, Calif. ARChITeCT: Thirtieth Street Architects, Newport Beach, Calif. geoTeChNICAl eNgINeeR: GMU Geotechnical Inc., Rancho Santa Margarita, Calif. pReCASTeR: Coreslab Structures (L.A.) Inc., Perris, Calif., a PCI-certified producer by Pieter Goedhart, T.Y. Lin International Pacific Coast Highway Pedestrian Bridge The Pacific Coast Highway Pedestrian Bridge seen at dusk stands as a gateway to the seaside resort community of Dana Point, Calif. Photo: Rob Szajkowski, Photographer. Bridge provides new gateway for Dana Point, California 22 | ASPIRE , Winter 2012 Book_Win12.indb 22 12/29/11 11:12 AM