PUNCHING SHEAR STRENGTH ANALYSIS OF POST-TENSIONED CONCRETE FLAT PLATES WITH SPANDREL BEAMS

An analytical procedure is presented for evaluating the punching shear strength Vu at the corner and edge column connections of post-tensioned concrete flat plates with and without spandrel beams. The effects of prestress are incorporated into the three equilibrium equations established for the bending and torsional moments and shear forces acting at the slab-column-spandrel connections. A fourth equation is derived which accounts for the interaction of bending, shear and torsion in the spandrel beam. An explicit formula for Vu is obtained by condensing these four equations. As part of the investigation, four half-scale models were built and tested to failure. Based on the test data for Vu the performance of the proposed procedure is compared with the methods recommended in the Australian Standard AS3600:1994, American Concrete Institute ACI318:89, and British Standard BS8110:1985 for prestressed concrete flat plates. The results indicate that the proposed analytical procedure is accurate and reliable for flat plates with or without spandrel beams. Applicable only to the system without spandrel beams, the BS provision is conservative in its prediction while the ACI approach is unsafe. It is also found that the Australian Standard procedure grossly overestimates the punching shear strength of flat plates with spandrel beams, particularly for the corner connections. (A)

  • Availability:
  • Corporate Authors:

    Institution of Structural Engineers

    11 Upper Belgrave Street
    London,   United Kingdom  SW1X 8BH
  • Authors:
    • LOO, Y C
    • CHIANG, C L
  • Publication Date: 1996-6-18

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 199-206
  • Serial:
    • Structural Engineer
    • Volume: 74
    • Issue Number: 12
    • Publisher: Institution of Structural Engineers
    • ISSN: 1466-5123

Subject/Index Terms

Filing Info

  • Accession Number: 00725490
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Sep 26 1996 12:00AM