Experimental Study on Reinforced Concrete Columns Having Wing Walls Retrofitted with Continuous Fiber Sheets

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Title: Experimental Study on Reinforced Concrete Columns Having Wing Walls Retrofitted with Continuous Fiber Sheets

Author(s): Y. Sonobe, Y. Matsuzaki, H. Nakamura, M. Iso, and M. Watanabe

Publication: Special Publication

Volume: 188

Issue:

Appears on pages(s): 1073-1088

Keywords: aramid fiber; carbon fiber; columns; fiber reinforced polymers; reinforced concrete; retrofit; seismic; wing walls

Date: 8/1/1999

Abstract:
In this paper the results of a series of tests, which were carried out using a total of 16 specimens of reinforced concrete (R/C) columns having wing walls retrofitted with fiber reinforced polymer (FRP) sheets as shear reinforcement, are described. In this work, the FRP sheets were adhered with epoxy resin. The specimens before retrofit were designed by the abolished Japanese seismic code before 1971. The primary test variables were the widths of the wing walls stretching from the columns, the kind of FRP sheets and its amount as shear reinforcement. It was observed that all specimens failed in a shear mode except for one specimen and that the ultimate shear strengths increased linearly in proportion to the amount of the fiber as shear reinforcement. ( i.e., the product of tensile strength and equivalent reinforcement ratio which corresponds to an replaced rectangular cross section of the column and the wing walls as a whole.) Based on the test results of regression analysis, an equation to evaluate the ultimate shear strength of R/C columns having wing walls retrofitted with FRP sheets is proposed.