00371178

Component

http://onlinepubs.trb.org...s/trr/1982/871/871-010.pdf

https://scholar.google.co...mans&publication_year=1982

Traditional methods for designing bridges that reduce the significant parameters affecting distribution of live loads to a single entity (e.g., stringer spacing or deck width) represent archaic oversimplifications. They are held over from the precomputer era and result in a spectrum of designs that range from ultraconservative to those that would be unsafe but for generous safety factors. Development of such distribution factors has usually been based on the assumption that all lanes on a structure are loaded with design vehicles, and such design methods become particularly meaningless when used in conjunction with hybrid loadings such as California's Permit-series, which comprises a single, heavy rating vehicle in combination with a single H-series design vehicle. Sophisticated analytical tools developed in the postcomputer era can provide very exact designs (perhaps more exact than warranted by live load specifications), but these tools are too cumbersome for use in a production environment. Presented here is an alternate, intermediate design method that combines relative exactness with a shortcut design approach that employs nomographic analysis for traditional designs and influence-line analysis for hybrid loadings. (Authors)

Publication of this paper sponsored by Committee on Concrete Bridges. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01411670

pp 47-52

1982

Transportation Research Record

61st Annual Meeting of the Transportation Research Board

0309034000

Print

Figures (4) ; References (22)

Box girders; Bridge design; Bridges; Concrete; Influence lines; Live loads; Load transfer; Nomographs; Structural design

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

TRIS, TRB

Mar 31 1983 12:00AM

• BEBO CONCRETE ARCH STRUCTURAL SYSTEM
• BRIDGE STRUCTURE CONSTRUCTION SYSTEM THAT USES TREATED LUMBER
• CURRENT PRACTICES IN SYSTEMS CONSTRUCTION OF CONCRETE BRIDGE STRUCTURES
• DESIGN OF A SKEW, REINFORCED CONCRETE BOX-GIRDER BRIDGE MODEL
• ELEVEN-YEAR PERFORMANCE OF TWO PRECAST, PRESTRESSED CONCRETE BRIDGE DECKS
• EVALUATION AND VERIFICATION OF TIME-DEPENDENT DEFORMATIONS IN POSTTENSIONED BOX-GIRDER BRIDGES
• FATIGUE RELIABILITY ANALYSIS OF HIGHWAY BRIDGES
• FULL-SPAN FORM PANELS FOR HIGHWAY BRIDGES
• I-205 OVER COLUMBIA RIVER BRIDGE: GEOMETRIC CONTROL FOR CAST-IN-PLACE AND PRECAST SEGMENTAL BOX-GIRDER CONSTRUCTION
• LOAD CAPACITY OF CONCRETE BRIDGE DECKS (ABRIDGMENT)
• PRECAST CONCRETE DECK MODULES FOR BRIDGE DECK RECONSTRUCTION
• RESPONSE OF 45 DEGREES SKEW, REINFORCED CONCRETE BOX-GIRDER BRIDGE MODEL TO AASHTO TRUCKS AND OVERLOAD CONSTRUCTION VEHICLES
• SEGMENTAL CONSTRUCTION FOR CONCRETE AND STEEL BRIDGES THAT INCORPORATE POSTTENSIONING
• SYSTEM CONSTRUCTION OF MEDIUM-SPAN BRIDGES IN PRESTRESSED CONCRETE