Bond tests on FRP retrofitted URM prisms

Abstract

The out-of-plane bending response of unreinforced masonry walls retrofitted with fibrereinforced polymer (FRP) strips is often governed by debonding failure mechanisms. Hence, it is necessary to quantify the fundamental interface shear-slip relationship, which describes the debonding behaviour of the FRP-to-masonry interface. This paper presents the results of a series of pull tests investigating the use of externally bonded and near-surface mounted retrofitting techniques. Test variables included: surface preparation; location of FRP (relative to perpend joints and cores); bonding agent of bed joints (mortar and quick drying paste); FRP material; and, geometric properties. The fabrication of specimens and test set-up are described along with a discussion of the test results. Preliminary practical recommendations are also provided. © 2007 Taylor & Francis Group, London.