00215594

Component

http://onlinepubs.trb.org...ubs/sr/sr132/sr132-009.pdf

TWO MAJOR REQUIREMENTS OF TOMORROW'S BRIDGES ARE ECONOMY AND AESTHETICS. EACH OF THE FOUR MATERIALS CONSIDERED HERE IS ECONOMICALLY COMPETITIVE IN SOME SITUATIONS AND NOT IN OTHERS, AND EACH HAS ITS OWN AESTHETIC USES AND LIMITATIONS. FUTURE CONCRETE USE INCLUDES ADJUSTABLE, NUMERICALLY CONTROLLED FORMS IN BOTH PRECAST AND SLIPFORM APPLICATION. STRENGTHS UP TO 10,000 PSI SHOULD BECOME COMMONPLACE, ESPECIALLY IN PRESENT APPLICATIONS. NEW CEMENTS AND IMPROVED METHODS OF ACCELERATING CURING WILL PRODUCE GREATER ECONOMY IN PRECAST OPERATIONS. USE OF SEL-STRESSING CEMENTS SEEMS MORE PROMISING THAN EVER BEFORE. LIGHTWEIGHT AGGREGATE PROMISES TO GAIN IN ACCEPTANCE. STEELS WILL UNDERGO STILL FURTHER INCREASES IN STRENGTH, AND NUMERICALLY CONTROLLED FABRICATION PROMISES TO IMPROVE NOT ONLY SPEED BUT ECONOMY AND PRECISION AS WELL. THIS WILL BE BENEFICIAL TO COMPLEX CONFIGURATIONS AS WELL AS TO REPETITIVE STANDARD UNITS. WHILE ALUMINUM'S GREAT ADVANTAGE IS ITS LIGHT WEIGHT AND FLEXIBILITY OF FABRICATION, IT SUFFERS FROM A RELATIVELY HIGH FIRST COST. ONCE THIS IS REDUCED, ALUMINUM WILL BECOME COMPETITIVE IN A BROADER RANGE OF APPLICATIONS. PROBABLY THE GREATEST FURTURE DEVELOPMENT IN WOOD WILL BE IN EDUCATING ENGINEERS REGARDING THE CAPABILITY OF GLUED AND LAMINATED STRUCTURAL TIMBERS FOR BRIDGE CONSTRUCTION.

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.

00815846

p. 60-71

1972

Highway Research Board Special Report

Workshop on Systems Building for Bridges

0309020638

Digital/other

Aluminum; Bridges; Concrete; Construction; Precast concrete; Prefabricated structures; Steel; Timber

Bridges and other structures; Construction; Highways

TRIS, TRB, ATRI

Apr 2 1973 12:00AM

• CONSTRUCTION ECONOMY THROUGH SYSTEMS BUILDING
• CURRENT PRACTICES IN STEEL CONSTRUCTION
• DESIGN, MANUFACTURE, TRANSPORTATION, AND ERECTION OF SYSTEMS BRIDGES
• Fast-Assembly Bridge Over the Aegidientorplatz in Hannover
• FOUNDATIONS, PIERS AND ABUTMENTS, SUPERSTRUCTURES, AND DETAILS AND APPURTENANCES OF SYSTEMS BRIDGES
• INFORMAL DISCUSSION ON SYSTEMS BUILDING FOR BRIDGES
• INTRODUCTION TO THE PROCEEDINGS OF A WORKSHOP ON SYSTEMS BUILDING FOR BRIDGES
• SYSTEMS BUILDING: FOUNDATIONS
• SYSTEMS CONCEPTS FOR PRECAST AND PRESTRESSED CONCRETE BRIDGE CONSTRUCTION
• WHAT DIRECTION IN BRIDGE BUILDING?