Title: A New Structurally and Thermally Efficient Precast Sandwich Panel System
Date: July-August, 1994
Volume: 39
Issue: 4
Page number: 90-101
Author(s): Amin Einea, David C. Salmon, Maher K. Tadros, Todd Culp
https://doi.org/10.15554/pcij.07011994.90.101
Click here to access the full journal article
Abstract
A new precast concrete sandwich panel system with a high thermal resistance and optimum structural performance has been developed. A hybrid truss provides the connector in this panel system - the diagonals are fiber-reinforced plastic bars and the chords are prestressed steel strands. Each connector consists of a fiber-reinforced plastic bar fabricated in a deformed spiral shape through which a pair of prestressing strands is threaded to provide anchorage in the concrete wythes. The developed shear connecting system is described together with its advantages. An experimental and analytical investigation of the connecting system was conducted. The experimental program included testing of small scale specimens by push-off (pure shear) loading, small scale specimens by flexural loading, and full scale panels by flexural loading. The analytical investigation included finite element modeling of the tested small scale specimens and comparisons with theory of elasticity solutions. Experimental and analytical results from finite element modeling and from theory of elasticity equations correlated well and showed that the developed panel system meets the objectives of the research and is expected to have a promising future.
References
1. PCI Design Handbook - Precast and Prestressed Concrete, Third Edition, Precast/Prestressed Concrete Institute, Chicago, IL, 1985, Chapter 9, pp. 2-22, 55-61.
2. AI-Einea, A., Salmon, D. C., Tadros, M. K., Culp T., and Fogarasi, G. J., "State-of-the-Art of Precast Concrete Sandwich Panels," PCI JOURNAL, V. 36, No. 6, November-December 1991, pp. 78-98.
3. Wade, T. G., Porter, M. L., and Jacobs, D. R., "Glass-Fiber Composite Connectors for Insulated Concrete Sandwich Walls," Report, Engineering Research Institute, Iowa State University, Ames, lA, 1988.
4. Jokela, J., and Sarja, A., "Development of Reinforcement of Sandwich Facade Element," Research Note No. 19, VTT-Technical Research Center of Finland, Espoo, Finland, 1981.
5. Einea, A., "Structural and Thermal Efficiency of Precast Concrete Sandwich Panel Systems," Ph.D. Dissertation, Department of Civil Engineering, University of Nebraska-Lincoln, Omaha, NE, 1992.
6. Culp, Todd, M.S. Thesis, University of Nebraska-Lincoln, Omaha, NE, December 1994.
7. Salmon, D. C., and Einea, A., "Partially Composite Sandwich Panel Deflections ," Approved for publication in the ASCE Journal of Structural Engineering.
8. Strzepek, W. R., "Overview of Physical Properties of Cellular Thermal Insulations," Insulation Materials, Testing, and Applications, ASTM STP 1030, American Society for Testing and Materials, Philadelphia, PA, 1990, pp. 121 -140.
9. Holmberg, A., and Plem, E., "Behavior of Load Bearing Sandwich-Type Structures," Handout No. 49, State Institute for Construction Research, Lund, Sweden, 1965.