Abstract
The suspended superstructure for the new Tacoma Narrows Suspension Bridge consists of a continuous welded steel truss with an integral orthotropic steel deck. The truss elements are fabricated of both closed box and open I-sections. The bridge, including particulars of the stiffening truss, is designed to accommodate a future lower roadway or LRT without the need for component strengthening. This paper will discuss the design aspects of this 1,646m (5,400 ft) continuous steel truss superstructure with integral orthotropic deck, including the development of design details to satisfy serviceability, fatigue, wind and seismic performance. Global superstructure and local component computer modeling techniques are presented as they relate to force and displacement demands and overall structure performance for the required 150-year service life. Performance requirements for high seismic hazard and computer analysis techniques using ADINA computer modeling software is discussed. Wind performance and physical wind tunnel testing utilizing full-bridge aeroelastic models for the bridge in its completed configuration is also discussed.
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