TIME-DEPENDENT DEFLECTION OF A BOX GIRDER BRIDGE
THE TIME-DEPENDENT DEAD-LOAD DEFLECTIONS OF A CONTINUOUS BOX GIRDER BRIDGE ARE COMPARED WITH THE VALUES OBTAINED BY A RATIONAL ANALYSIS BASED ON THE MODIFIED-ELASTIC-MODULUS METHOD. WARPAGE AND DEFLECTION DUE TO SHRINKAGE ARE ESTIMATED BY APPLYING THE PRINCIPLES OF SUPERPOSITION USING AN EFFECTIVE ELASTIC MODULUS AND AN ASSUMED SHRINKAGE POTENTIAL FOR THE CONCRETE. THE ANALYSIS DEMONSTRATES THAT TIME-DEPENDENT DEFLECTION OF PLAIN REINFORCED CONCRETE STRUCTURES ARE NOT OVERLY SENSITIVE TO THE MAGNITUDE OF THE CREEP COEFFICIENT ASSUMED BECAUSED OF THE STIFFENING EFFECT OF THE REINFORCEMENT. SIMILARLY THE SHRINKAGE DEFLECTION IS ESSENTIALLY INDEPENDENT OF THE CREEP BECAUSE OF A REDUCTION IN THE WARPING MOMENT AS CREEP STRAINS ARE DEVELOPED. HOWEVER, WHILE THE GENERAL FORM OF THE DEFLECTION PROFILE PREDICTED BY THE EFFECTIVE MODULUS METHOD OF ANALYSIS AGREES WITH FIELD BEHAVIOR, THE OBSERVED FIELD DEFLECTIONS ARE SOMEWHAT SMALLER. /BPR/
- Record URL:
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Supplemental Notes:
- Hpr-1/6/, MHD 60-2
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Corporate Authors:
University of Missouri, Columbia
1205 University Avenue
Columbia, MO United States 65201Missouri State Highway Commission
State Highway Building
Jefferson City, MO United States 65101Bureau of Public Roads /US
400 7th Street, SW
Washington, DC United States 20590 -
Authors:
- Pauw, A
- Sherkat, A A
- Publication Date: 1968-1
Subject/Index Terms
- TRT Terms: Box girders; Concrete; Continuous structures; Creep; Deflection; Girder bridges; Modulus of elasticity; Reinforced concrete bridges; Shrinkage; Static loads; Superposition (Geology); Time; Warpage
- Uncontrolled Terms: Warping
- Old TRIS Terms: Concrete box girders; Concrete creep; Superposition
- Subject Areas: Bridges and other structures; Highways;
Filing Info
- Accession Number: 00207860
- Record Type: Publication
- Source Agency: Bureau of Public Roads /US
- Files: TRIS, STATEDOT
- Created Date: Apr 2 1994 12:00AM