Long-term design of FRP-PUR web-core sandwich structures in building construction

Published on Dec 1, 2017in Composite Structures5.138
· DOI :10.1016/J.COMPSTRUCT.2017.08.089
Sonia Yanes-Armas4
Estimated H-index: 4
(EPFL: École Polytechnique Fédérale de Lausanne),
Julia de Castro15
Estimated H-index: 15
(EPFL: École Polytechnique Fédérale de Lausanne),
Thomas Keller45
Estimated H-index: 45
(EPFL: École Polytechnique Fédérale de Lausanne)
Abstract The structural behavior of GFRP-polyurethane (PUR) web-core sandwich structures subjected to sustained loading was investigated. As a basis, a study of the mechanical behavior of rigid PUR foams used as core materials was conducted, with emphasis on creep. The study showed that the foam anisotropy, its density and the loading type applied must be considered to assess the structural performance of the GFRP-PUR web-core sandwich. The influence of creep on the web-core interaction, i.e. on the shear load distribution and local instability phenomena were then analyzed. The effects of applying particular design recommendations on the design were assessed based on the example of a real GFRP-PUR sandwich roof. The design shear resistance of the GFRP webs, their dimensions and governing failure mode significantly depended on the applied recommendation. A design procedure to evaluate the overall shear resistance of the GFRP-PUR core over time, taking into account creep effects, was presented.
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