seismic upgrading of masonry structures with frp

seismic upgrading of masonry structures with frp

12 Pages · 2002 · 664 KB · English

structures. As a consequence most of these structures need seismic upgrading work in order to ensure their conservation and functional use. A considerable amount of research has been conducted in the past to improve the mechanical behavior of masonry structures using a variety of reinforcement 

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SEISMIC UPGRADING OF MASONRY STRUCTURES WITH FRP A Borri, University of Perugia, Italy M Corradi , University of Perugia, Italy A Vignoli, University of Florence, Italy Abstract This study aims to provide a basic understanding of the behavior of masonry structures reinforced with Fiber Rein forced Polymers (FRP) epoxybonded to the masonry surfaces The main investigation consis ts of three parts: the first relates to the determination of shear strength of masonr y specimens reinforced using carbon and glass FRP Several specimens have been tested in order to determine the tangential modulus of elasticity and the shear strengt h of the masonry The second part of the investigation relates to the seismic upgrading of masonry vaults or arches The use of carbon and glass FRP as a reinforcing method for different kinds of vaults or arches, as well as the different possible positions of the FRP sheets, is analyzed, and some solutions are proposed to avoid peeling problem s and increase the efficiency of the bond surface The third and final par t of the investigation is concerned with a method of reinforcing masonry structures by wrappi ng FRP sheets around the external perimeters of buildings to avoid outofplane mechanisms Keywords: seismic upgrading, masonry structur es, shear strength, vault, FRP sheet, outof plane mechanism 1 Introduction Many unreinforced masonry structures are widel y present throughout Italy and other regions around the world These structures seem to suffer t he most severe damage during earthquakes Not only the prohibitive cost of replacing all substandard structures , but also the conservation of the historic heritage of the country, necessitates the dev elopment of innovative techniques for rehabilitating deteriorating structures As a consequence most of these struct ures need seismic upgrading work in order to ensure their conservation and functional use A considerable amount of research has been conducted in the past to improve the mechanical behavior of masonry structures using a variety of reinforcement techniques The shear reinforcement of walls was realized by employing metallic bars, or in jecting lime or cement based mortars In recent years, reinforcing concrete struct ures by the wrapping and bonding of FiberReinforced Polymers made of sheets, straps, belts or procur ed shells has became increasingly popular, but limited research has been conducted on the use of FRP reinforc ement in masonry structures In countries such as Italy, the use of brickwork as a building material has prompted a wide range of studies to investigate its structural behavior in a variety of applications As an example, Di Tommaso and others first applied FRP in order to upgrade the seismic behavior of belltowers [1] This paper contains an abstract of the most part of research carried out by the authors dur ing the years following the UmbrianMarchigiano earthquake of 1997 References are reported at the end of this paper 2 Shear reinforcement of masonry w alls Various kinds of intervention may be carried out to upgrade a wall Currently, the most wide spread technique consists of injecting limebased grout s or fixing a metal net on masonry surfaces under a concrete jacket Borri, Corradi and Vignoli applied th is technique in order to upgrade several twoleaf and threeleaf walls The results substantially showed that while the injection technique can be effective when used as a repair technique, its adoption as a preventive measure necessitates a previous, careful analysis of the masonry texture and of its characteristics, in order to under stand if the grout can, in effect, penetrate it

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