Delamination in reinforced concrete retrofitted with fiber reinforced plastics
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2005
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| Online Access: | http://hdl.handle.net/1721.1/9141 |
| _version_ | 1826196097937178624 |
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| author | Hearing, Brian Phillip, 1972- |
| author2 | Oral Buyukozturk. |
| author_facet | Oral Buyukozturk. Hearing, Brian Phillip, 1972- |
| author_sort | Hearing, Brian Phillip, 1972- |
| collection | MIT |
| description | Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000. |
| first_indexed | 2024-09-23T10:21:08Z |
| format | Thesis |
| id | mit-1721.1/9141 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T10:21:08Z |
| publishDate | 2005 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/91412019-04-11T00:49:32Z Delamination in reinforced concrete retrofitted with fiber reinforced plastics Hearing, Brian Phillip, 1972- Oral Buyukozturk. Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. Civil and Environmental Engineering. Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000. Includes bibliographical references (leaves 251-269). The addition of fiber-reinforced plastic (FRP) laminates bonded to the tension face of concrete members is becoming an attractive solution to the rehabilitation and retrofit of damaged structural systems. Flexural strength is enhanced with this method but the failure behavior of the system can become more brittle, often involving delamination of the composite. This study investigates failure modes including delamination with the use of fiber reinforced plastics to rehabilitate various concrete structures. The focus is on delamination and its causes, specifically in the presence of existing cracks in the retrofitted concrete system. First, delamination processes in FRP retrofitted concrete systems are studied through combined experimental and analytical procedures. The delamination process is observed to initiate in the concrete substrate with micro cracks that coalesce into an unstable macro crack at failure. This macroscopic behavior is modeled through a finite element procedure with a smeared crack approach, which is found to be limited in the ability to represent the stress intensity at the delamination tip. For this reason it is shown that interfacial fracture mechanics can be used to describe the bimaterial elasticity and complex stress intensity at the delamination tip and provide a criterion governing the propagation of delamination using energy methods. Then, peeling processes occurring at existing cracks in the retrofitted system are studied through fracture mechanics based experimental and analytical procedures. An experimental program involving specialized shear notch specimens demonstrates that the location of the notch and laminate development length are influential on the shear crack peeling process. A finite element procedure is used to evaluate the crack driving forces applied at the shear notch crack mouth, and the fracture analysis is extended to evaluate initiation of peeling at the shear notch scenario. Finally, delamination failures in FRP retrofitted reinforced concrete beams representing "real-life" retrofit scenarios are investigated. An experimental and analytical program is conducted to investigate influences on the failure processes. The application of the fracture based peeling analysis to a quantitative design procedure is investigated, and a computational design aid to assist the iterative design procedure is developed. by Brian Phillip Hearing. Ph.D. 2005-08-22T23:03:10Z 2005-08-22T23:03:10Z 2000 2000 Thesis http://hdl.handle.net/1721.1/9141 45233863 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 277 leaves 22813896 bytes 22813650 bytes application/pdf application/pdf application/pdf Massachusetts Institute of Technology |
| spellingShingle | Civil and Environmental Engineering. Hearing, Brian Phillip, 1972- Delamination in reinforced concrete retrofitted with fiber reinforced plastics |
| title | Delamination in reinforced concrete retrofitted with fiber reinforced plastics |
| title_full | Delamination in reinforced concrete retrofitted with fiber reinforced plastics |
| title_fullStr | Delamination in reinforced concrete retrofitted with fiber reinforced plastics |
| title_full_unstemmed | Delamination in reinforced concrete retrofitted with fiber reinforced plastics |
| title_short | Delamination in reinforced concrete retrofitted with fiber reinforced plastics |
| title_sort | delamination in reinforced concrete retrofitted with fiber reinforced plastics |
| topic | Civil and Environmental Engineering. |
| url | http://hdl.handle.net/1721.1/9141 |
| work_keys_str_mv | AT hearingbrianphillip1972 delaminationinreinforcedconcreteretrofittedwithfiberreinforcedplastics |