Abstract
This work presents an indeterminate strut-and-tie (IST) method to analyze concrete deep members reinforced by fibre-reinforced polymer (FRP) bars. Because FRP bars are linear elastic, and brittle at failure, the classical ST method based on steel yielding cannot be used to analyze FRP-reinforced concrete deep beams, and current code provisions lack guidance on such designs. Thus, the IST method is proposed for the analysis. This work addresses the details of using the proposed IST method to analyze FRP-reinforced concrete deep beams including how to size the struts and nodes without assuming steel yielding, how to model the compressive behaviour of concrete struts reasonably, and how to construct and analyze statically indeterminate ST models. Eight FRP-reinforced concrete deep beams with and without stirrups are analyzed in this work, and the results are compared against the test results to lead to conclusions and recommendations on the application of the proposed method in analyzing the shear strengths of FRP-reinforced concrete deep beams.
Published Version
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