00804692

Component

https://doi.org/10.3141/1740-15

http://scholar.google.com...Seif&publication_year=2000

The transverse bracing provisions (diaphragms, cross-braces, cross-frames, and so on) of the 1998 AASHTO load and resistance factor design (LRFD) bridge design specifications for the design of deck-type highway bridges are examined. This examination suggests that implementation of these provisions not only will have an adverse effect on the integrity and durability of reinforced concrete deck slabs, and consequently on life-cycle bridge costs; implementation of such provisions also has the potential to affect the desirability of steel bridge construction adversely. Instead of avoiding the use of midspan braces, as implied by LRFD provisions, it is urged that midspan braces be more generally recognized as primary elements of complex superstructure structural systems and thus be sized and spaced to function not only as transverse flange braces but also integrally with concrete deck slabs to distribute vehicular loads laterally. Such a practice not only will yield more efficient higher-quality structural systems capable of functioning effectively for 100 years or more, thus doubling their presently expected lives, but it will also help extend the service lives of the more vulnerable reinforced concrete deck slabs.

This paper appears in Transportation Research Record No. 1740, Structural Design Issues.

English

p. 118-125

2000

Transportation Research Record

0309067448

Figures (2) ; References (6)

Bridge decks; Bridge design; Bridge superstructures; Durability; Highway bridges; Life cycle costing; Load and resistance factor design; Reinforced concrete; Service life; Specifications

American Association of State Highway and Transportation Officials

Midspan braces; Structural integrity; Transverse braces

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

TRIS, TRB, ATRI

Jan 17 2001 12:00AM

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