Optimized Nu sandwich panel system for energy, composite action and production efficiency

George Morcous, Maher K. Tadros, Mark Lafferty, Doug Gremel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

Typical precast/prestressed concrete sandwich panels (PCSP) consist of an internal wythe of insulation and two external wythes of concrete. They are intended to be structurally composite and thermally efficient. However, frequent penetrations of the insulation wythe with concrete and steel connectors required to achive composite action can significantly diminish the thermal efficiency. NU-PCSP utilizes a patented glass fiber-reinforced polymer (GFRP) connector system (NU-Ties). The system was conceived by researchers at the University of Nebraska-Lincoln in mid 1990s, and has undergone several iterations of refinements since then. The system has been used single family homes, multistory condominiums, and large warehouses. The main advantages of NUTies are high structural performance, low thermal conductivity, and ease of installation. This paper describes the system in detail and provides information on the structural design, thermal analysis and production practice of NU-PCSP. The experimental program to optimize the distribution of NU-Ties and its effect on the flexural capacity and stiffness of PCSP is also presented. Research results indicated that NU-Tie distribution has a significant impact on the flexural capacity and stiffness of PCSPs. Full composite action is attainable and a truss model and finite-element model, rather than a beam model, can better predict panel deformations.

Original languageEnglish (US)
Title of host publication3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference
Subtitle of host publicationThink Globally, Build Locally, Proceedings
PublisherPrecast Prestressed Concrete Institute
ISBN (Electronic)9780937040904
StatePublished - Jan 1 2010
Event3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010 - Washington, United States
Duration: May 29 2010Jun 2 2010

Publication series

Name3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings

Other

Other3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010
CountryUnited States
CityWashington
Period5/29/106/2/10

Keywords

  • Composite action
  • Horizontal shear
  • Sandwich panel
  • Shear connector
  • Thermal efficiency

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering

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  • Cite this

    Morcous, G., Tadros, M. K., Lafferty, M., & Gremel, D. (2010). Optimized Nu sandwich panel system for energy, composite action and production efficiency. In 3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings (3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings). Precast Prestressed Concrete Institute.