1 FRP Strengthening of URM Walls Subject to Out-of-Plane Loads J. Gustavo Tumialan, Nestore Galati and Antonio Nanni Abstract: Unreinforced masonry (URM) walls are prone to failure when subjected to out-of- plane loads caused by earthquakes or high wind pressure. This paper presents the results of an experimental program on the flexural behavior of URM walls strengthened with externally bonded Fiber Reinforced Polymer (FRP) laminates as well as on the influence of the putty filler on the bond strength. Based on the experimental evidence, the paper provides a design approach for the strengthening with FRP laminates of URM walls that are analyzed as simply supported members. The database includes URM walls strengthened with different amounts and types of externally bonded FRP reinforcement. Keywords: FRP Laminates, Flexural Strengthening, Masonry Strengthening, Out-of-Plane Failure, Unreinforced Masonry (URM) J. Gustavo Tumialan is a Research Engineer at the Center for Infrastructure Engineering Studies (CIES) at the University of Missouri-Rolla (UMR), where he received his M.Sc. and Ph.D. degrees in Civil Engineering. He received his B.Sc. from the Pontificia Universidad Catolica del Peru (PUCP). His research interests include rehabilitation of masonry and reinforced concrete structures. Nestore Galati is a Graduate Research Assistant at CIES at UMR where he is pursuing a M.Sc. degree in Engineering Mechanics. He is also a doctoral student in Composite Materials for Civil Engineering at the University of Lecce, Italy, where he received his B.Sc. in Materials Engineering. His research interests include repair of masonry and reinforced concrete structures. Antonio Nanni, FACI, is the V&M Jones Professor of Civil Engineering and Director of CIES at UMR. He is interested in construction materials, their structural performance, and field application. He is an active member of several ACI technical committees.