00209264

Component

https://onlinepubs.trb.or...bproceedings/11/11-007.pdf

A RATHER STRONG CASE IS MADE FOR THE TREATED TIMBER BRIDGE IN SHORT SPAN LENGTHS BY MR. SEILER IN HIS PAPER ON TREATED TIMBER TRESTLES. HE CAREFULLY REFRAINS FROM A DISCUSSION OF LONGER SPAN POSSIBILITIES. THE DISCUSSER FEELS THAT HE HAS FAILED TO TAKE INTO ACCOUNT THE VALUE OF ARCHITECTURAL POSSIBILITIES AND HAS MADE TOO MUCH OF THE MATTER OF OBSOLESCENCE. HE IS SOMEWHAT OVERLY OPTIMISTIC REGARDING AVERAGE MAINTENANCE EXPENSE FOR TREATED TIMBER. AN EXCELLENT CASE WAS MADE BY MR. FRANKLAND FOR LOW COST STEEL HIGHWAY BRIDGES. HOWEVER, THE DISCUSSER FEELS THAT HE HAS SHOWN A TENDENCY TO MINIMIZE MAINTENANCE COSTS AND IN THE CASE OF THE STEEL PILE BRIDGE, TO EXTEND THE USE OF STEEL INTO A FIELD WHERE THE POSSIBILITY OF ITS SUCCESSFUL COMPETITION IS PROBLEMATICAL. MR. FLEMING'S PAPER ON THE USE OF CONCRETE AS AN ECONOMIC HIGHWAY BRIDGE MATERIAL PRESENTS A COMPLETE ECONOMIC ANALYSIS, BUT HAS USED A PERCENTAGE RATE FOR MAINTENANCE PLUS AMORTIZATION FOR CREOSOTED TIMBER WHICH PLACES THIS MATERIAL AT A DISADVANTAGE. THE DESCRIPTION OF IMPROVED DETAILS, AND REVIEW OF CURRENT DESIGN PRACTICE ARE HIGHLY INSTRUCTIVE. HOWEVER, IN ADVOCATING THE USE OF PERMANENT CONSTRUCTION FOR LATERAL ROADS, HE APPEARS TO ATTEMPT THE EXTENSION OF CONCRETE SLIGHTLY BEYOND ITS TRUE FIELD OF ECONOMIC UTILITY. EACH OF THE PAPERS DISCUSSED CONSTITUTES A DIRECT CONTRIBUTION TO AVAILABLE ENGINEERING LITERATURE PERTINENT TO HIGHWAY BRIDGE TYPES; EACH OF THE AUTHORS HAS MADE AN EXCELLENT PRIMA FACIE CASE FOR THE PARTICULAR STRUCTURAL MATERIAL DISCUSSED, AND HAS BEEN RATHER FAIR IN HIS STATEMENTS.

Vol 11, Pt 1, PP 114-123, 2 FIG, 2 TAB; part of Report of Committee on Highway Design: A Symposium on the Economics of Low Cost Highway 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.

01490418

1932

Highway Research Board Proceedings

Digital/other

Amortization; Bridge superstructures; Concrete; Creosote; Economic analysis; Economics; Highway bridges; Maintenance management; Steel; Structural materials; Support piles; Timber; Trestles

Bridge spans; Maintenance costs; Steel piling; Treatment

Bridges and other structures; Economics; Finance; Highways; Society

TRIS, TRB

Jun 29 1971 12:00AM

• A NEW THEORY OF FROST HEAVING
• DISCUSSION ON FROST HEAVING
• DISCUSSION ON LOW COST BRIDGES
• ECONOMICS OF LOW COST BRIDGES
• ECONOMICS OF LOW COST HIGHWAY BRIDGES
• FACTORS AFFECTING VOLUME CHANGES IN CONCRETE AND THEIR SIGNIFICANCE IN DESIGN
• FIELD EXPERIMENTS IN SUBGRADE DRAINAGE AND TREATMENT
• FIELD METHODS FOR MEASURING TIRE WEAR
• Fillers and Bedding Courses for Brick Pavements
• FUNCTIONS OF STEEL REINFORCEMENT IN CONCRETE PAVEMENTS AND PAVEMENT BASES
• LOAD LIMITATIONS ON HIGHWAYS
• LOW COST STEEL HIGHWAY-BRIDGES
• REPORT ON CULVERT INVESTIGATION
• REPORT ON STATE CONTROL OF TRAFFIC
• REPORT ON TRAFFIC LAW OBSERVANCE AND ENFORCEMENT METHODS
• REPORT ON VEHICLE AND HIGHWAY MECHANICS AS RELATED TO TRAFFIC
• RESISTANCE OF CONCRETE TO FROST ACTION AS AFFECTED BY THE WATER-CEMENT RATIO
• SOME PRINCIPLES OF SOIL SURVEYING AND SOIL MAPPING FOR ROAD PURPOSES
• TAXATION AND EXPENDITURES IN THE STATE OF WISCONSIN
• THE AIR RESISTANCE OF MOTOR VEHICLES
• THE ECONOMICS OF LOW COST BRIDGES
• THE EFFECT OF HOT CEMENT ON TIME OF SET AND WORKABILITY OF CONCRETE
• THE EFFECTIVENESS OF CALCIUM CHLORIDE AS A DUST PALLIATIVE AND ITS VALUE TO GENERAL ROAD MAINTENANCE
• THE SIGNIFICANCE OF SODIUM SULFATE AND FREEZING AND THAWING TESTS OF MINERAL AGGREGATES
• TRAFFIC CAPACITY
• TREATMENT OF ICY PAVEMENTS
• USE OF CONCRETE AS AN ECONOMIC HIGHWAY BRIDGE MATERIAL
• VOLUME CHANGES IN CONCRETE SLABS IN THE FIELD