00183791

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http://onlinepubs.trb.org...r/1978/665v2/665v2-018.pdf

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

To estimate the traffic loading on long span bridges two independent statistical techniques were developed. One was purely analytical, the other used a computer to generate random "traffic" and calculate the maximum load on the bridge. The two methods gave remarkably similar results. Further research produced not only maximum loads, but also maximum moments and shears. From this work the following results emerge: With a knowledge of the average mix of traffic, a design loading can be estimated with a good degree of confidence using the techniques developed. The loading can be accurately represented by a uniform load and a concentrated load in the traditional manner. Unlike the AASHO loading, one set of uniform and concentrated loads can be used to represent both maximum moment and maximum shear. As expected, the uniform load per foot reduces as the loaded length is increased. Unlike AASHO and previous assumptions, it is found that the concentrated load increases as the loaded length increases. When several lanes are loaded simultaneously they do not, as suggested by AASHTO, all carry the same load. A simple distribution formula has been found. These results have significant implications for the designers of long span bridges; and typical results have been produced for various types of traffic. /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.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 146-154

1978

Transportation Research Record

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

0309026970

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Figures (9) ; Photos (1) ; References (9) ; Tables (2)

Bridge design; Bridges; Engineering moments; Estimates; Long span bridges; Shear strength; Structural design; Traffic loads

Bridges and other structures; Freight Transportation; Highways

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
• ECONOMICAL STRUCTURES FOR LOW-VOLUME ROADS
• 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
• TRANSVERSE POST-TENSIONING OF LONGITUDINALLY LAMINATED TIMBER BRIDGE DECKS
• WEB STRESSES IN PRESTRESSED CONCRETE BRIDGE BEAMS HAVING DISCONTINUOUS TENDONS