A STUDY OF GIRDER DEFLECTIONS DURING BRIDGE DECK CONSTRUCTION
PROBLEMS INVOLVED IN OBTAINING THE DESIRED THICKNESS OF BRIDGE DECKS WERE INVESTIGATED. THE STUDY, WHICH WAS LIMITED TO DECKS WHICH WERE LONGITUDINALLY SCREEDED DURING CONSTRUCTION, INCLUDED (1) FIELD MEASUREMENTS OF THE GIRDER DEFLECTIONS DURING CONSTRUCTION, AND (2) A THEORETICAL FRAME ANALYSIS OF THE GIRDER DEFLECTIONS UNDER THE FIELD LOADING CONDITIONS. EACH OF THE TWO SPANS INVESTIGATED WERE SIMPLY SUPPORTED STEEL PLATE GIRDER DESIGNS. THE MOST SIGNIFICANT FACTORS CAUSING THE DECK FORMING TO BE TOO HIGH AT THE TIME THE CONCRETE IS SCREEDED WERE: (1) PLAN DEAD LOAD DEFLECTION VALUES WHICH ARE IN ERROR, (2) THE DIFFERENTIAL TEMPERATURES EXISTING BETWEEN THE TOP AND BOTTOM FLANGES OF THE GIRDERS DURING CONCRETE PLACEMENT AS OPPOSED TO THOSE THAT MAY HAVE EXISTED WHEN THE FORMING ELEVATIONS WERE ESTABLISHED, AND (2) THE TRANSVERSE POSITION OF THE CONCRETE DEAD LOADING AT THE TIME A FINAL SCREEDING PASS IS MADE OVER A GIVEN POINT ON A SPAN. BASED ON THE RESULTS OF THE STUDY, CERTAIN RECOMMENDATIONS ARE OFFERED REGARDING THE COMPUTATION OF DEAD LOAD DEFLECTIONS AND PRECAUTIONS TO BE OBSERVED DURING CONSTRUCTION WHEN LONGITUDINAL SCREEDING OF THE CONCRETE DECK IS USED.
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- Record URL:
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Supplemental Notes:
- 51 PP
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Corporate Authors:
Virginia Highway Research Council
Charlottesville, VA United States -
Authors:
- Hilton, M H
- Publication Date: 1971-6
Subject/Index Terms
- TRT Terms: Bridge decks; Concrete finishing; Deflection; Girders; Static loads; Temperature; Thickness
- Uncontrolled Terms: Temperature distribution
- Subject Areas: Construction; Highways;
Filing Info
- Accession Number: 00215522
- Record Type: Publication
- Files: NTL, TRIS, ATRI
- Created Date: Jul 9 1972 12:00AM