1,720,986 research outputs found
Fiber Reinforced Composites for the Strengthening of Masonry Structures
No full textMasonry structures are prone to extensive damage followed by failure and collapse when subjected to loads resulting from wind, earthquake and other natural or man-made events. Recent earthquakes and terrorist acts have clearly demonstrated that the development of effective and affordable strategies for the strengthening of masonry is urgently needed. as a response to these challenges, fiber-reinforced polymer (FRP) composites may offer technically and economically viable solutions. in the context of work undertaken worldwide, this paper presents an overview of research studies and field applications of masonry strengthening with FRP composites as conducted in the last five years at the University of Missouri-Rolla. in particular, the paper covers material forms and installation techniques, namely: externally bonded laminates, near surface mounted bars, and post-tensioning; experimental test programs dealing with the out-of-plane and in-plane behavior of walls with discussion of failure modes, field validation and applications including historical structures. Without providing full details, an effort has been made to address issues related to design so that practicing engineers can immediately appreciate the potential of this technology and understand the key parameters affecting performance and the areas that need further experimentation
Strengthening with FRP Bars of URM Walls Subject to Out-of-Plane Loads
No full textThis paper presents the results of an experimental program on the flexural behavior of un-reinforced masonry (URM) walls strengthened with near surface mounted (NSM) fiber reinforced polymers (FRP) bars. A total of 15 URM walls reinforced with NSM FRP bars were tested. The specimens were strengthened with different amounts of reinforcement to observe their improved performance and the mode of failure. The influence of the bar shape (i.e., circular vs. rectangular), FRP material, dimension of the groove and type of embedding material (i.e., epoxy or cementitious-based paste), were studied. Based on experimental evidence and on the data found in the literature, the paper provides criteria that can be used in the development of design guidelines
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