Unreinforced masonry (URM) walls are prone to failure when subjected to out-of-plane loads caused by earthquakes or high wind pressures. In this context, fiber reinforced polymer (FRP) materials may be a solution to solve or lessen the effects of this overloading. This paper describes an experimental program dealing with the flexural behavior of nine URM walls strengthened with glass FRP (GFRP) twisted sand-coated bars and subjected to out-of-plane loads. The reinforcement was placed vertically in different amounts and spacing. Two different embedding materials (epoxy-based paste and latex modified cementitious paste) were used to encapsulate the bars into the joints. This research allowed to compare different behaviours and failure modes of strengthened URM walls by changing the parameters described above. Design guidelines are also provided.
Out-of-plane behavior of URM walls strengthened with NSM GFRP bars
VALLUZZI, MARIA ROSA;MODENA, CLAUDIO;
2003
Abstract
Unreinforced masonry (URM) walls are prone to failure when subjected to out-of-plane loads caused by earthquakes or high wind pressures. In this context, fiber reinforced polymer (FRP) materials may be a solution to solve or lessen the effects of this overloading. This paper describes an experimental program dealing with the flexural behavior of nine URM walls strengthened with glass FRP (GFRP) twisted sand-coated bars and subjected to out-of-plane loads. The reinforcement was placed vertically in different amounts and spacing. Two different embedding materials (epoxy-based paste and latex modified cementitious paste) were used to encapsulate the bars into the joints. This research allowed to compare different behaviours and failure modes of strengthened URM walls by changing the parameters described above. Design guidelines are also provided.Pubblicazioni consigliate
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