An experimental study of autoclaved aerated concrete lintels strengthened with externally bonded glass FRP

Ali M. Memari, Andres Lepage, Jarin Setthachayanon

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

This article presents the experimental data obtained from four-point loading of AAC lintels and compares the measured failure loads with capacities predicted using the conventional strength-design method. Fiber-reinforced polymer (FRP) fabrics are used to strengthen existing concrete structures as an alternative to externally bonded steel plates. Design approaches have been developed for application of FRP on conventional concrete surfaces, but there are other types of concrete materials that have not been sufficiently studied for FRP application. Autoclaved aerated concrete (AAC) is one such material introduced in the US market in the mid 1990s. There is an interest in evaluating the feasibility of application of FRP to retrofit existing structures or components made of AAC (e.g., AAC lintels, floor panels, wall panels, etc.). The specimens used in this study include AAC lintels without FRP and with two alternative schemes of FRP applied to the external lintel surfaces for flexural and shear strengthening. Specimens of conventional reinforced concrete were also tested for comparison with AAC when both are strengthened with FRP. The measured test data provide a basis for evaluating the accuracy of existing strength-design equations to predict the capacity of such specimens. Test results show that the application of FRP at the bottom of the lintels, in combination with U-wrap at the ends of the lintels, increases the load and deflection capacities. Comparison of test results and calculated strengths shows that the existing guidelines such as ACI 440.2R and ACI 523.4R give safe estimates of shear and flexural strength for FRP-enhanced AAC lintels.

Original languageEnglish (US)
Pages (from-to)3322-3337
Number of pages16
JournalJournal of Reinforced Plastics and Composites
Volume29
Issue number22
DOIs
StatePublished - Nov 1 2010

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Materials Chemistry

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