01322219

Component

https://doi.org/10.3141/2201-12

http://scholar.google.com...onda&publication_year=2010

As part of the rebuilding efforts after Hurricane Katrina, the Mississippi Department of Transportation awarded a design–build contract for the replacement of the 2.1-mi-long US-90 bridge spanning Bay St. Louis. With a January 25, 2006, start date, the deadline for opening two lanes of traffic was May 16, 2007, followed by a February 15, 2008, deadline for opening the entire bridge. The bridge was constructed as two separate structures except for the navigation unit, where the deck and substructure are continuous between the eastbound and westbound structures. To allow for such an aggressive construction schedule, several concepts were used. Plans were delivered in stages to allow construction to proceed before the final submittal. The use of precast components including girders, piles, and capbeams was maximized. Pile bents to a height of 75 ft above fixity were used, with no battered piles. The pile and girder sections were varied to allow for utilization of more precast fabricators. Precast, prestressed piles, ranging in length from 50 to 164 ft, form the bridge foundations of the pile bents (24- and 36-in. piles) and waterline footings (30-in. piles). Typical superstructure elements consist of BT-78 girders (maximum span of 154 ft) and AASHTO Type IV girders (maximum span of 112 ft). A spliced haunch girder system with a 250-ft main span and 200-ft end spans was implemented at the navigational channel to satisfy the vertical and horizontal clearances.

01322203

7IBEC-0057

English

pp 106-112

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309160421

Print

Figures (2) ; Photos (5) ; References (7)

Bents; Bridge construction; Bridge design; Bridge foundations; Bridge superstructures; Design build; Footings; Girders; Precast concrete; Support piles

Capbeams

Bay St. Louis (Mississippi)

Bridges and other structures; Construction; Design; Highways; I24: Design of Bridges and Retaining Walls; I53: Construction of Bridges and Retaining Walls

TRIS, TRB, ATRI

Dec 6 2010 10:39AM

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