YIELD-LINE ANALYSIS AND DESIGN OF GRIDS

YIELD-LINE ANALYSIS AND DESIGN PROCEDURES ARE PRESENTED FOR ORTHOGONAL GRID SYSTEMS. CONFIRMING LABORATORY TESTS ARE PRESENTED AND DISCUSSED. THE YIELD-LINE MATHEMATICAL ANALYSIS ASSUMES AN ORTHOGONAL STEEL GRID FORMED OF SINGLE SIZE FLEXURAL MEMBERS, EACH HAVING AN ASSUMED PLASTIC MOMENT CAPACITY. THE ANALYSIS DOES NOT ACCOUNT FOR THE EFFECTS OF CORNER LEVERS AND EQUIVALENT NODAL FORCES. THESE FACTORS, WHILE ACKNOWLEDGED, ARE THOUGHT TO BE AN UNNECESSARY REFINEMENT. LOAD TESTS WERE CONDUCTED ON TOW GRID SYSTEMS, BOTH COMPOSED OF BAR-JOIST-LIKE MEMBERS. THE LOAD TEST WAS CARRIED OUT IN A MANNER SIMULAR TO THAT USED FOR THE MODEL GRID SYSTEM. THE RESULTS OF THESE LOAD TESTS INDICATE ACTUAL COLLAPSE LOADS OF THE ORDER OF 90-100% OF THE THEORETICAL COLLAPSE LOAD. IT APPEARS THAT GRIDS HAVE LESS RESERVE STRENGTHS THAN SLABS. THE TESTS REPORTED INDICATE THAT FOR THEORETICAL YIELD-LINE COLLAPSE LOAD PROVIDES A GOOD, YET UPPER BOUND, MEASURE OF THE TRUE COLLAPSE LOAD. FOR PRELIMINARY DESIGN, LOAD FACTORS OF 2.3 AND 2.0 FOR GRID AND SLAB, RESPECTIVELY, ARE THOUGHT TO BE REASONABLE.

  • Supplemental Notes:
    • Vol 6, No 4, PP 124-129, 7 FIG, 5 REF
  • Authors:
    • Cannon, J P
  • Publication Date: 1969-10

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00209112
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 24 1970 12:00AM