00183775

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http://onlinepubs.trb.org...r/1978/665v2/665v2-002.pdf

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

In pretensioned girders, draping of strands can be avoided by using straight tendons having unbonded "blanketed" lengths at the ends of girders. An experimental investigation was carried out to determine the effect of repetitive loading on the behavior and strength of girders with draped and blanketed strands. Six full-size Type II AASHTO-PCI girders were tested. Two girders contained draped strands. The other girders had straight strands with four tendons blanketed at each end. The effects of load level, development length, and confining ties were investigated. The test program called for 5-million cycles of loading followed by a static test to destruction. The paper presents results of the investigation and shows that blanketed strands can be used successfully if adequate strand development length is provided. Fatigue fracture of strands was observed in pre-cracked beams where load level produced tensile stress in the precompressed concrete. /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 13-21

1978

Transportation Research Record

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

0309026970

Print

Figures (10) ; Photos; References (13) ; Tables (3)

Accelerated tests; Beams; Behavior; Concrete bridges; Fatigue (Physiological condition); Fatigue tests; Girder bridges; Prestressed concrete; Prestressing; Repeated loads; Strength of materials; Tendons; Tension

Tensile stress

Bridges and other structures; 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
• 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