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Spanning a valley between two hospitals, this stayed
pedestrian bridge makes a visual impact on the city of Portland.
The 650 foot long superstructure is made up of 25 foot sections
of jumbo chord, boxed trusses. Somerset developed the erection scheme
based on the lifting capacity of the steel erector's crane. The
main span was free cantilevered from both towers, and a step-by-step
analysis was performed for all stages. Other items provided were
design of jacking systems for stays, back span tie-down design and
tensioning sequences, analysis checks of partially welded support
towers during superstructure cantilevering, and jacking scheme for
mid-span closure.
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