Out-of-plane testing of masonry infills strengthened using fibre reinforced matrix with prior in-plane damage
by Najif Ismail; Tamer El-Maaddawy; Nouman Khattak; Kevin Q. Walsh; Jason M. Ingham
International Journal of Masonry Research and Innovation (IJMRI), Vol. 5, No. 3, 2020

Abstract: Performance of fibre reinforced cementitious matrix (FRCM) strengthened masonry infills under sequential bi-directional earthquake induced lateral loading, which is far from well-understood, was experimentally investigated herein. A total of eight single bay reinforced concrete frames were constructed with unreinforced hollow concrete masonry infills, of these one was tested non-retrofitted that served as control test assembly and the remainder were strengthened using varying FRCM types and configurations. The test assemblies were subjected to cyclic in-plane loading gradually increasing to 1% story drift, replicating lateral loading due to a moderate earthquake. These already in-plane damaged test assemblies were then subjected to gradually increasing monotonic OOP loading until failure. Resulting damage patterns, failure mechanisms, measured force-displacement response and stiffness characteristics were discussed. FRCM strengthening delayed the onset of out-of-plane cracking, instigated a more controlled failure mode, with strengthened infills exhibiting out-of-plane strength of 1.72.0 times that of the control specimen.

Online publication date: Wed, 01-Jul-2020

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