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Dokken Engineering completed the strategy for the seismic retrofit of three bridges under an “on-call” contract for the design of seismic retrofits of county bridges. The bridges included:
- Garfield Avenue Bridge over Rio Hondo Channel
The bridge is 292 feet long, 63 feet wide, and a 4-span curved structure constructed at a skew. The composite superstructure consists of 8 steel plate girders with a reinforced concrete deck. The structure is supported by pier walls with strip footings on precast reinforced concrete piles. Retrofits included construction of bumper and catcher blocks for each girder at the abutments and piers, longitudinal restrainers between girders, and diaphragms between girders at span ends.
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- Long Beach City College Pedestrian Overcrossing over Carson Street
The bridge is a 96-foot long, 8-foot wide plate girder structure with the walkway supported by floor beams and stringers. The recommended retrofit consisted of adding steel or reinforced concrete seat extenders.
- Glendale College Pedestrian Overcrossing over Canada and Verdugo Roads
The bridge is 207 feet long, 8 feet wide, has 2 spans, and is 5 feet deep prestressed concrete girders with a concrete deck. The recommended retrofit consisted of strengthening the foundation by adding a CIDH pile connected to the pier with a link beam, constructing link beams between piers, strengthening columns and ramp joints, and adding restrainers at each end of the main spans.
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