Paper number 759


Young-Joo Lee1, Thomas E. Boothby1, and Charles E. Bakis2

1Department of Architectural Engineering, 104 Engineering Unit A,
The Pennsylvania State University, University Park, PA 16802, USA
2Department of Engineering Science & Mechanics, 227 Hammond Bldg.,
The Pennsylvania State University, University Park, PA 16802, USA

Summary Reinforced concrete tensile specimens reinforced with FRP sheets were tested during this investigation. Each of the rectangular concrete prisms was treated with a different reinforcement system. High strength carbon FRP sheet reinforcement on concrete specimens were investigated, as well as push-apart specimens of bricks. The brick specimens were reinforced with the same types of FRP, with three different sheet widths and two different bond lengths. Finite element modeling is used to predict the behavior of the specimens in the region of the sheet bonded reinforcement. Both the experimental and the analytical results show the development of high tensile strains in the concrete and in the masonry. The concrete specimens develop diagonal tensile stresses in the vicinity of transverse cracks. Masonry specimens with narrow sheet reinforcement fail by rupture of the FRP sheet. On the other hand, the masonry specimens reinforced with wider width shows an assortment of premature failure modes such as FRP sheet breakage, debonding, and brick failure. Diagonal tension cracks both along the boundary of the reinforcement and near the point where the reinforcement crosses a brick bed joint were observed. In both materials, diagonal cracks develop at locations away from the end of the reinforcing sheet. These diagonal cracks precipitate a softening and weakening of the concrete specimens and the failure of the brick specimens.
Keywords concrete, civil applications, FRP sheet, shear.

Theme : Reinforcement and repair in Civil Engineering and Building Construction

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