Advertisement

Experimental Mechanics

, Volume 16, Issue 9, pp 356–360 | Cite as

Effect of axial loads on concrete-mortar sandwich composites

Paper describes the experimental behavior of rectangular sandwich composites under compressive and tensile loads. The composites were composed of reinforced-concrete mortar facings with nonpermeated expanded aluminum-honeycomb core and the experimental results were compared with proposed theories
  • M. K. Phang
  • H. Kraus
Article
  • 48 Downloads

Abstract

Experimental investigations were conducted to examine the behavior of concrete sandwich composites under compressive and tensile loads. The sandwich cores were composed of nonpermeated, expanded aluminum honeycomb and the facings consisted of concrete mortar. Appropriate theories that predict the behavior of such composites were presented and compared with experimental data. All specimens had facing thicknesses of 1 in. (25.4 mm), core thicknesses of 1, 2 and 3 in. (25.4, 50.8 and 76.2 mm); core-cell size of 1/8 and 3/8 in. (3.2 and 9.5 mm); while four different core foil gages were considered for each size. The facings were either plain concrete mortar or reinforced with steel wires.

The large-core-cell-size specimen displayed better bond characteristics and produced more consistent experimental data. The ultimate strengths of both compressive and tensile specimens were not affected by the core-cell size, core thickness, or core density. Axial compressive loads were carried by the facing area while tensile loads were by the reinforcements in the facings. The buckling waves were developed due to the wrinkling of the facings. The buckling waves in the two facings were independent of each other and the overall wave pattern was antisymmetrical.

Keywords

Fluid Dynamics Axial Load Ultimate Strength Compressive Load Tensile Specimen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of Symbols

Ast

total area of reinforcing steel

b

width of facing

Ef

concrete-facing modulus

Es

modulus of elasticity of reinforcing steel

f′c

compressive strength of concrete cylinder

fy

yield strength of reinforcing steel

P′uc

ultimate axial compressive load

P′ut

ultimate tensile load

t

facing thickness

\(\varepsilon _u\)

ultimate strain of concrete

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Hoff, N. J., “The Strength of Laminates and Sandwich Structural Elements,”John Wiley and Sons, New York (1949).Google Scholar
  2. 2.
    Plantema, F. J., “Sandwich Construction—The Bending and Buckling of Sandwich Beams, Plates, and Shells,”John Wiley and Sons, New York (1966).Google Scholar
  3. 3.
    Habip, L. M., “A Survey of Modern Developments in the Analysis of Sandwich Structures,” Ap. Mech. Rev.,18 (2) (Feb. 1965).Google Scholar
  4. 4.
    Phang, M. K. S., “Structural Behavior of Reinforced Concrete Sandwich Constructions,”Dissertation, Rensselaer Polytechnic Institute, Troy, NY (Mar. 1970).Google Scholar
  5. 5.
    Holmberg, A. (in Swedish), “Sandwich Panels Constituted by Jointly Acting Component Panels,”Nordisk Betong, (Stockholm),2,377–389 (1958).Google Scholar
  6. 6.
    Holmberg, A., andPlem, E., (in Swedish), “Testing and Applications of Sandwich Elements,”Nordisk Beton (Stockholm),4,277–304 (1960).Google Scholar
  7. 7.
    Pfeifer, D. W., andHanson, J. A., “Precast Concrete Wall Panels: Flexural Stiffness of Sandwich Panels,”ACI Publ., SP-11, 67–86 (1965).Google Scholar
  8. 8.
    Scoggin, H. L., andPfeifer, D. W., “Cast-in-Place Concrete Residences with Insulated Walls,”J. of the PCA Res. and Dev. Lab.,9 (2),2–7 (May 1967).Google Scholar
  9. 9.
    Scoggin, H. L., “Cast-in-Place Concrete Residences with Insulated Walls,”J. of the Portland Cement Assoc.,8 (2),21–29 (May 1966).Google Scholar
  10. 10.
    Van Horn, D. A., and Wilson, K. E., “Structural Behavior of Reinforced Concrete Sandwich Beams,” Engrg. Rep. 37, Iowa Engineering Experiment Station, Iowa State University (1962).Google Scholar
  11. 11.
    Phang, M. K. S., andKraus, H., “Flexural Behavior of Reinforced-concrete Sandwich Composites,”Experimental Mechanics,12 (12),549–556 (Dec. 1972).Google Scholar
  12. 12.
    Hexcel Products Inc., Dublin, CA, “Mechanical Properties of Hexcel Materials,” TSB 120 (1966).Google Scholar
  13. 13.
    “Structural Sandwich Constructions; Wood; Adhesives,” ASTM Standards, Part 16 (June 1968).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1976

Authors and Affiliations

  • M. K. Phang
    • 1
  • H. Kraus
    • 2
  1. 1.Soros AssociatesNew York
  2. 2.Rensselaer Polytechnic Institute of ConnecticutHartford

Personalised recommendations