PARAMETERS INFLUENCING TERMINAL MOVEMENT ON CONTINUOUSLY REINFORCED CONCRETE PAVEMENT

IN 1960 THE TEXAS HIGHWAY DEPARTMENT BEGAN CONSTRUCTING CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS WITH TERMINAL ANCHORAGE SYSTEMS IN AN ATTEMPT TO MINIMIZE LARGE END MOVEMENTS. THE FIRST ANCHORAGE SYSTEM CONSISTED OF A SERIES OF FIVE CONCRETE LUGS SPACED 15 FEET APART AND CAST MONOLITHICALLY WITH THE PAVEMENT. SUBSEQUENTLY, DIFFERENT NUMBERS OF LUGS WERE USED WITH PAVEMENTS OF DIFFERENT LENGTHS BUILT ON SEVERAL SUBBASE TYPES AND PERCENT GRADES. ABOUT TWO YEARS AGO A STUDY WAS INITIATED FOR THE PURPOSE OF EVALUATING THE INFLUENCE OF THESE VARIABLES ON TERMINAL MOVEMENT. A STATISTICAL ANALYSIS WAS MADE OF END-MOVEMENT DATA OBTAINED FROM 48 END-ANCHORAGE SYSTEMS. THIS ANALYSIS INDICATED THAT THE END MOVEMENT OF A CONTINUOUSLY REINFORCED PAVEMENT IS DIRECTLY RELATED TO TEMPERATURE CHANGE AND SLAB LENGTH UP TO 1,000 FEET, AND INVERSELY RELATED TO NUMBER OF LUGS, PERCENT GRADE AND SUBBASE FRICTION. USING THE DATA OBTAINED IN THE STUDY, AN EMPIRICAL EQUATION WAS DEVELOPED WHICH ENCOMPASSES ALL THE ABOVE VARIABLES. IN ADDITION, A NOMOGRAPH WAS DERIVED THAT MAY BE USED AS A GUIDE FOR DETERMINING THE NUMBER OF LUGS REQUIRED FOR TERMINAL ANCHORAGE SYSTEMS FOR A GIVEN SET OF CONDITIONS. TENTATIVE CONCLUSIONS DRAWN FROM THE STUDY ARE /1/ TERMINAL ANCHORAGE SYSTEMS ARE NOT REQUIRED FOR CERTAIN COMBINATIONS OF SUBBASE FRICTION AND PERCENT GRADE, AND /2/ THE DESIGN OF TERMINAL ANCHORAGE SYSTEMS USED BY THE TEXAS HIGHWAY DEPARTMENT SHOULD BE REVISED TO PROVIDE FOR THE PROPER NUMBER OF LUGS FOR ANY GIVEN SET OF CONDITIONS. /BPR/

• Supplemental Notes:
  • Hpr-1/4/, BPR NO5, STATE NO39
• Corporate Authors:

  Texas State Department of Highways & Public Transp

  11th and Brazos Streets
  Austin, TX  United States  78701
• Authors:
  • McCullough, B F
  • Sewell, T F
• Publication Date: 1964-8

Subject/Index Terms

• TRT Terms: Anchorages; Concrete; Continuously reinforced concrete pavements; Equations; Friction; Length; Lugs; Monoliths; Motion; Nomographs; Pavement design; Slabs; Statistical analysis; Subbase (Pavements); Temperature
• Uncontrolled Terms: Change; Subbase
• Geographic Terms: Texas
• Old TRIS Terms: Empirical equations; End movement; Grade profile; Terminal anchorage systems
• Subject Areas: Bridges and other structures; Data and Information Technology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 00207777
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS, STATEDOT
• Created Date: Mar 1 1994 12:00AM