00183804

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http://onlinepubs.trb.org...r/1978/665v2/665v2-026.pdf

https://scholar.google.co...erud&publication_year=1978

Sharp increases in prices and a concurrent decline in highway revenues have forced a re-evaluation of highway projects. Most seriously affected are the old bridges since, unlike the rest of the highway, their life cannot be indefinitely extended by maintenance. A national bridge survey reveals that 105,000 bridges in the U.S. are structurally deficient and/or functionally obsolete and 72,000 of these are on roads that are not on the federal-aid system. The needs on our low-volume roadway system far exceed program funds available. The potential economies suggested in this paper will hopefully lead to better utilization of the funds available. This paper investigates the economics of low-volume structures. It discusses the most economical bridge types being constructed in the Northwest. Although, not primarily addressed to the hydraulics involved in stream crossings, the paper discusses some of the hydraulic considerations that should be made. Attention is directed to actual practice of agencies constructing bridges on low-volume roads. The three principal structural materials of concrete, timber, and steel are discussed. Certain structural details are suggested for economy, as well as structural types. The comments and recommendations contained in this paper are based on a survey made in the Northwestern United States. /Author/

This paper appeared in Transportation Research Record No. 665, Bridge Engineering, Volume 2. Proceeding of a conference conducted by the Transportation Research Board, September 25-27, 1978. Also in Transportation Research Board Special Report No. 160. 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

01489599

pp 214-221

1978

Transportation Research Record

Bridge Engineering Conference, 1st, 1978, St Louis, Missouri, USA

0309026970

Print

Figures (11) ; Photos; Tables (1)

Bridge design; Bridges; Concrete; Construction management; Economics; Hydraulics; Low volume roads; Maintenance; Revenues; Steel; Structural design; Timber; Transportation

Bridges and other structures; Economics; Maintenance and Preservation; Transportation (General)

TRIS, TRB

Dec 12 1978 12:00AM

• A CRITICAL EXAMINATION OF THE WAVE EQUATION
• AERODYNAMIC STABILITY OF TWO CABLE-STAYED BRIDGES
• ANALYSIS AND TESTING OF A TRAPEZOIDAL BOX GIRDER BRIDGE
• APPLICATION AND DESIGN OF PRESTRESSED DECK PANELS
• APPLICATION OF PREFABRICATED HOLLOW STEEL DECKS TO BRIDGE CONSTRUCTIONS
• CONCRETE CABLE-STAYED BRIDGES
• CONSIDERATIONS IN THE DEVELOPMENT OF AN EARLY WARNING VESSEL/BRIDGE COLLISION SYSTEM
• CURRENT PRACTICE IN DESIGN AND INSTALLATION OF DRIVEN PILES
• DEVELOPMENT OF A SIMPLIFIED METHOD OF LATERAL LOAD DISTRIBUTION FOR BRIDGE SUPERSTRUCTURES
• DYNAMIC RESPONSE OF A SINGLE TRACK RAILWAY TRUSS BRIDGE
• DYNAMIC RESPONSE OF BRIDGES
• FATIGUE TESTS OF PRESTRESSED GIRDERS WITH BLANKETED AND DRAPED STRANDS
• INCREASING THE SEISMIC RESISTANCE OF EXISTING HIGHWAY BRIDGES
• LABORATORY AND FIELD STUDIES OF A PEDESTRIAN BRIDGE COMPOSED OF GLASS REINFORCED PLASTIC
• METHODS OF CALCULATION OF THE WIND-INDUCED RESPONSES OF SUSPENDED-SPAN BRIDGES
• MODEL STUDIES OF DOUBLE-CELL BOX GIRDER BRIDGE WITH INTERMEDIATE DIAPHRAGMS
• MULTIPLE SERVICE LEVEL BRIDGE RAILINGS--PERFORMANCE AND DESIGN CRITERIA
• PRACTICAL BRIDGE RETROFIT CONCEPTS TO REDUCE DAMAGE PRODUCED BY SEISMIC MOTIONS
• RECENT DEVELOPMENT OF CONSTRUCTION TECHNIQUES IN CONCRETE BRIDGES
• REDUCING THE RISK OF CATASTROPHIC BRIDGE FAILURES
• SEGMENTAL AND STAGE CONSTRUCTION OF PRESTRESSED CONCRETE BOX GIRDER BRIDGES
• SEGMENTAL BRIDGE CONSTRUCTION IN WESTERN EUROPE--IMPRESSIONS OF AN IRF STUDY TEAM
• STRUCTURAL PROBLEMS FOR THE MESSINA NARROWS BRIDGE
• SYSTEMS CONSTRUCTION TECHNIQUES FOR SHORT-SPAN CONCRETE BRIDGES
• TEST RESULTS FROM THE CONESTOGO RIVER BRIDGE
• THE DESIGN AND CONSTRUCTION OF THE NEW RIVER GORGE BRIDGE
• THE DEVELOPMENT OF THE ONTARIO HIGHWAY BRIDGE DESIGN CODE
• TRAFFIC LOADING OF LONG SPAN BRIDGES
• TRANSVERSE POST-TENSIONING OF LONGITUDINALLY LAMINATED TIMBER BRIDGE DECKS
• WEB STRESSES IN PRESTRESSED CONCRETE BRIDGE BEAMS HAVING DISCONTINUOUS TENDONS