Anchorage and bond characteristics of externally bonded fiber reinforced polymer laminates used for shear strengthening of reinforced concrete and prestressed concrete girders
"In the last three decades, the use of fiber reinforced polymer (FRP) materials to strengthen structures externally has emerged as one of the most promising technologies in materials and structural engineering, and these materials have been gaining popularity in the civil engineering community. Externally bonded FRP sheets and laminates have been used successfully to increase flexural and shear capacity. The overall performance of the strengthened system depends heavily on the quality of the bond between the concrete and the FRP laminate. Low bond strength can cause delamination at the fiber-matrix interface and at the FRP laminate-concrete interface. As a result, a premature failure of a repaired structure occurs. Therefore, anchorage systems are necessary to enhance the shear contribution of FRP by preventing premature failure due to debonding.
This study analyzed the existing experimental and analytical studies of various mechanical anchorage systems and the bond behavior of FRP composite materials externally bonded to concrete to identify the parameters affecting the design of mechanical anchorage systems. Based on this analysis, several configurations of mechanical anchorage systems were tested on full-scale prestressed concrete (PC) girders and reinforced concrete (RC) T-beams. Eight full-scale PC girders and six RC T-beams were constructed with various stirrup spacings, strengthened with various FRP schemes, and tested in the Highbay Structures Laboratory at Missouri University of Science and Technology (S&T). During the test, the bond behavior was recorded and applied to existing analytical models for validation. Based on the test results, the present study offers a new approach to calculate effective bond length. The anchorage systems considered here consist of thick plate and steel anchor bolts, which many studies found to be the most practical. Based on this work, the present study proposes design guidelines for mechanical anchorage systems"--Abstract, page iii.
Ayoub, Ashraf Salah Eldin
Showalter, William E.
Bae, Sang-Wook, 1972-
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
Missouri University of Science and Technology
xx, 232 pages
© 2009 Carlos Andres Ortega Ordonez, All rights reserved.
Thesis - Restricted Access
Reinforced concrete -- Testing
Anchorage (Structural engineering)
Fibrous composites -- Evaluation
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu:80/record=b10158442~S5
Ortega Ordonez, Carlos Andres, "Anchorage and bond characteristics of externally bonded FRP laminates used for shear strengthening of RC and PC girders" (2009). Masters Theses. 4491.
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