Application of Brittle Materials to Strengthen Masonry

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

Abstract

Fibre Reinforced Polymer Strengthening (FRP) has become a popular method for retrofitting masonry structures. It is easily applied by attaching bonding either dry fibre mats or pre-formed plates to an existing structure. The ease of installation, the lightweight materials used, and their low corrosion rates have resulted in FRP strengthening becoming the strengthening method of choice for many applications. Both the FRP composite strengthening and the adhesive joint, however, are brittle. Brittle failure is accompanied by imperfection
sensitivity, a lack of energy dissipation during cyclic loading, and an inability to redistribute load paths when unpredicted loads are applied to a structure. Furthermore, the stress in the FRP strengthening is prevented from approaching its ultimate capacity, by the adhesive connection failure.

If the growth of the debonded region of strengthening is halted by a positive anchor, the FRP will act as a simple elastic element with a length defined by the spacing of the anchorages. As an in-plane shear crack opens in the
masonry, load will be transferred to the FRP, and furthermore, the FRP confines the masonry, increasing the shear load that it carries and the ductility of the system. This paper reports preliminary tests in which unbonded FRP ‘bandages’ were applied to small masonry panels, demonstrating the technique as an alternative to bonded strengthening.
Original languageEnglish
Title of host publication8th International Seminar on Structural Masonry
EditorsBraj Sinha, Leyla Tanacan
Place of PublicationIstanbul
PublisherCizgi Basim Yayin Ltd
Pages315-322
ISBN (Print)978-975-561-342-0
Publication statusPublished - 2008

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