AN EXPERIMENTAL INVESTIGATION OF THE BEHAVIOR OF COMPOSITE PRESTRESSED TILE BEAMS AND SLAB

A SERIES OF EXPERIMENTAL STUDIES WERE CONDUCTED TO OBSERVE THE STRUCTURAL BEHAVIOR OF PRETENSIONED, PRESTRESSED CONCRETE BEAMS STATICALLY LOADED INDIVIDUALLY AND AS COMPONENTS OF A SLAB SPAN WITH A CONCRETE TOPPING CAST IN- SITU. THE PRESTRESSED BEAMS WERE COMPOSED OF HOLLOW STRUCTURAL CLAY TILE UNITS MORTARED END TO END WITH A PRETENSIONED STRAND RUNNING LENGTHWISE THROUGH THE VOIDS. THE VOIDS THEN SERVED AS A FORM FOR THE ADDITION OF CONCRETE TO CREATE AN INTEGRAL BEAM. ALL TEST BEAMS WERE WITHOUT CONCRETE TOPPING AND FIVE WERE DESIGNED WITHOUT END BLOCKS FOR INDIVIDUAL TESTS. THESE DEVELOPED CRACKING AND SEPARATION WITH THE TRANSFER OF PRESTRESS. TEN BEAMS WERE INCORPORATED IN THE COMPOSITE SLAB AND WERE CAST WITH END BLOCKS AS WERE TWO OTHER SPECIMENS INTENDED FOR A STUDY OF PRESTRESS LOSSES. INDIVIDUAL BEAM TESTS CONSISTED OF PURE FLEXURE AND FLEXURE SHEAR LOADINGS RESULTING IN FAILURES THAT WERE SUDDEN AND BRITTLE. THEORETICAL MOMENT CAPACITY WAS DEVELOPED BUT ALL BEAMS TESTED IN FLEXURE-SHEAR FAILED TO DEVELOP THE THEORETICAL SHEAR CAPACITY CALCULATED FROM THE ACI CODE, POSSIBLY DUE TO CRACKING DEVELOPED AT TRANSFER DUE TO LACK OF END BLOCKS. THE SLAB SPAN CONSISTING OF TEN BEAMS PLACED SIDE-BY-SIDE WITH A 3-5/8 INCH REINFORCED DECK ADDED WITHOUT SHEAR CONNECTORS, BEHAVED ELASTICALLY BEFORE THE CRACKING LOAD AND EVIDENCED GOOD TRANSVERSE LOAD DISTRIBUTION. THE SYSTEM STUDIED WAS CONCLUDED TO HAVE MERIT AS A STRUCTURAL METHOD WITH PROPER END ANCHORAGE. FURTHER STUDY OF THE PRESTRESSED TILE UNITE BEHAVIOR UNDER REPEATED LOADING IS NEEDED BEFORE CONSIDERATION FOR BRIDGE MEMBERS.

• Supplemental Notes:
  • Hps-1/27/, 30JUN64
• Corporate Authors:

  North Carolina State University, Raleigh

  Raleigh, NC  United States  27695
• Authors:
  • Zia, P
  • Byrd, E M
• Publication Date: 1964-6-30

Subject/Index Terms

• TRT Terms: Beams; Bridge superstructures; Cast in place structures; Clay; Composite construction; Concrete; Crash investigation; Distributions (Statistics); Experiments; Flexure; Loads; Masonry construction; Prestressed concrete; Prestressing; Pretensioning; Shear strength; Slabs; Static loads; Structural analysis; Structural mechanics; Studies; Testing; Tile
• Uncontrolled Terms: Bridge spans; Loading; Structural behavior; Transverse distribution
• Old TRIS Terms: Clay masonry; Static loading; Topping
• Subject Areas: Bridges and other structures; Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00207729
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Oct 1 1994 12:00AM