CFRP strengthening of concrete bridges with curved soffits

Author

Nagaraj Eshwar

Abstract

"The objective of this research program was to study carbon fiber reinforced polymer (CFRP) strengthening of reinforced concrete (RC) members with soffit curvature. In the presence of curvature, the FRP laminates attempts to straighten under tension leading to direct transverse tensile stress at the adhesive-concrete interface, which may cause premature peeling. This tensile stress could also lead to concrete cover being ripped off prematurely. Ten beams, 6 m in length and having the same soffit curvature (i.e. 5 mm per meter), extending over 1, 3 and 5 meters, were tested under a three-point static flexure. Two different types of CFRP strengthening techniques, wet layup laminates and pultruded precured laminates were used for external strengthening. One of the beams strengthened with CFRP wet layup laminates (5 meter of curved soffit), was anchored using glass FRP spike anchors to prevent peeling. Significant increases in flexural capacity ranging from 27% to 82% were registered in all the strengthened beams as compared to unstrengthened (control) beam. Beams with soffit curvature limited to 1 meter, failed at similar loads when compared with control specimens (flat soffit). For beams having a soffit curvature extending to 3 and 5 meters, reduction in the strength were observed because of premature peeling. Inclusion of spike anchors with the wet layup system led to the performance superior to the benchmark specimen (flat soffit) confirming that the application of the spike anchors delays premature peeling. The performance of two different FRP based anchor systems for CFRP wet layup in both flexural and shear strengthening was also determined"-- Abstract, p. iv

Advisor(s)

Nanni, Antonio
Ibell, Timothy James

Committee Member(s)

Myers, John J.
Zoughi, R.

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Comments

Accompanying CD-ROM, available at Missouri S&T Library, contains research program videos.
System requirements: CD-ROM drive with AVI compatible video player.

Publisher

University of Missouri--Rolla

Publication Date

Spring 2004

Pagination

xii, 127 pages, CD-ROM

Note about bibliography

Includes bibliographical references (pages 10, 25, 47, and 80)

Rights

© 2004 Nagaraj Eshwar, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Concrete bridges -- Design and constructionReinforced concrete construction

Thesis Number

T 8484

Print OCLC #

56475121

Recommended Citation

Eshwar, Nagaraj, "CFRP strengthening of concrete bridges with curved soffits" (2004). Masters Theses. 2496.
https://scholarsmine.mst.edu/masters_theses/2496