REINFORCEMENT LAP FAILURES

RECENTLY, RESEARCH WAS CONDUCTED BY WISS, JANNEY AND ASSOCIATES TO DEVELOP INFORMATION ON THE LAP REQUIREMENTS FOR LONGITUDINAL STEEL OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS TO ESTABLISH PROPER DESIGN CRITERIA FOR LAPPING. RESULTS ARE PRESENTED OF THE LABORATORY TESTS CONDUCTED AT LEHIGH UNIVERSITY ON LAPS FOR DEFORMED BARS AND DEFORMED WELDED WIRE FABRIC. A TOTAL OF SIX CONCRETE SPECIMENS WERE TESTED, FOUR REINFORCED WITH NO. 5 DEFORMED BARS, A432 STEEL AND TWO REINFORCED WITH DEFORMED WELDED WIRE FABRIC HAVING THREE LONGITUDINAL D18.4 WIRES. A STRAIN CYCLE WAS APPLIED TO EACH SPECIMEN AT CONCRETE AGE OF 1, 2 AND 3 DAYS BEFORE LOADING TO ULTIMATE FAILURE AT 4 DAYS. FAILURE CRITERION WAS BASED ON WHICH OF CRACK OPENING AT THE LAP OF THE REINFORCING STEEL. ALL SIX OF THE LAPS SUCCESSFULLY WITH- STOOD THE THREE STRAIN CYCLES AND THE ULTIMATE LOAD TESTS. IN SUMMARY, THE TESTS INDICATED THAT' /1/ A LAP LENGTH OF 16 INCHES IS ADEQUATE FOR NO. 5 BARS AND /2/ A LAP LENGTH OF 18 INCHES IS ADEQUATE FOR THE DEFORMED WELDED WIRE FABRIC. THE TESTS DID NOT DETERMINE THE MINIMUM LENGTH OF LAP FOR THE TWO TYPES OF REINFORCEMENT.

  • Supplemental Notes:
    • Hpr-1/21/, BPR 11, PDH 363, SEP64
  • Corporate Authors:

    Lehigh University

    Bethlehem, PA  United States  18015
  • Authors:
    • Adams, R G
    • VanHorn, D A
  • Publication Date: 1964-9

Subject/Index Terms

Filing Info

  • Accession Number: 00205335
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 1 1994 12:00AM