Considering the Options (Available in Structural Engineering Special Section only)

by Mark R. Capron, P.E., (M.ASCE), Proj. Mgr.; Sverdrup Civil, Inc., Maryland Heights, MO,

Serial Information: Civil Engineering—ASCE, 1999, Vol. 69, Issue 12, Pg. A14-A20

Document Type: Feature article


In work for the Missouri Department of Transportation (MoDOT), Sverdrup Civil, Inc. performed a seismic evaluation and developed a seismic retrofit strategy for the Poplar Street Bridge over the Mississippi River at St. Louis. The 2,165 ft (660 m) structure consists of two parallel five-span continuous roadways with orthotropic steel plate decks and variable depth steel box girders. The seismic evaluation considered three levels of design earthquakes and identified deficiencies in the bearings, reinforcement splices in the columns and piers, and one foundation. The retrofit strategy includes adding force transmitters or dampers to the existing expansion bearing piers, adding transverse shear blocks to the beam seats, jacketing the column splices, adding rock anchors to one foundation, and adding supplemental reinforcement to address lap splice deficiencies at the base of the piers.

Subject Headings: Steel structures | Steel plates | Steel decks | Seismic tests | Piers | Seismic design | Rehabilitation

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