Modeling of Direct Load Transmission in Lightweight-Concrete-Core Sandwich Beams

This paper describes an experiment that was conducted to investigate the direct load transmission behavior of hybrid sandwich beams consisting of a bottom fiber-reinforced polymer skin and a top concrete skin. The sandwich core consisted of lightweight concretes (LCs) of different brittleness. A continuous direct load transmission model is proposed that consists of a diagonal bottle-shaped strut with an infinite number of transverse ties. The statically indeterminate system allows stress redistribution resulting from post-peak material softening after concrete cracking to be taken into account. This led to accurate modeling of the varying experimental responses due to different material brittleness. The arch rise of the bowed compression strut decreased after cracking due to the available width of the diagonal strut being reduced to the distance between initiating and propagating cracks parallel to the strut. The arch rise at concrete cracking was correlated to the LC splitting tensile strength. The arch rise at ultimate load was correlated to the LC characteristic length.

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  • Authors:
    • Schaumann, Erika
    • Vallee, Till
    • Keller, Thomas
  • Publication Date: 2009-7


  • English

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  • Accession Number: 01140936
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 10 2009 11:23PM