Size effect on shear strength of concrete beams reinforced with FRP bars

F. Marta, Antonio Nanni, N. Galati, F. Mosele

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)

Abstract

The use of glass fiber reinforced polymer (GFRP) bars as internal reinforcement for portions of massive concrete retaining walls to be penetrated by tunnel boring machines (TBMs), commonly referred to as softeyes, is becoming mainstream. The low shear strength and inherent brittleness of GFRP bars greatly facilitate penetration of the TBM, preventing damage to the disc cutters, and eliminating the risk of costly delays. The safe shear design of softeyes and large members in general must account for the strength decrease due to size effect. To date, this phenomenon has not been documented for FRP reinforced concrete (RC). In this paper, the results of laboratory tests on four large-scale concrete beams reinforced with GFRP bars in flexure and shear are presented and discussed. Preliminary results are reported that indicate a decrease in concrete shear strength attributable to size effect, which is offset by an implicit understrength factor in the current ACI 440 design formula. Further experimental research is ongoing to better characterize the extent of size effect in FRP RC.

Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures
Pages1077-1084
Number of pages8
Volume2
StatePublished - Dec 1 2007
Event6th International Conference on Fracture Mechanics of Concrete and Concrete Structures - , Italy
Duration: Jun 17 2007Jun 22 2007

Other

Other6th International Conference on Fracture Mechanics of Concrete and Concrete Structures
CountryItaly
Period6/17/076/22/07

Fingerprint

Shear strength
Glass fibers
Concretes
Reinforced concrete
Tunnels
Polymers
Retaining walls
Brittleness
Reinforcement

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials
  • Building and Construction

Cite this

Marta, F., Nanni, A., Galati, N., & Mosele, F. (2007). Size effect on shear strength of concrete beams reinforced with FRP bars. In Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures (Vol. 2, pp. 1077-1084)

Size effect on shear strength of concrete beams reinforced with FRP bars. / Marta, F.; Nanni, Antonio; Galati, N.; Mosele, F.

Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures. Vol. 2 2007. p. 1077-1084.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Marta, F, Nanni, A, Galati, N & Mosele, F 2007, Size effect on shear strength of concrete beams reinforced with FRP bars. in Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures. vol. 2, pp. 1077-1084, 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures, Italy, 6/17/07.
Marta F, Nanni A, Galati N, Mosele F. Size effect on shear strength of concrete beams reinforced with FRP bars. In Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures. Vol. 2. 2007. p. 1077-1084
Marta, F. ; Nanni, Antonio ; Galati, N. ; Mosele, F. / Size effect on shear strength of concrete beams reinforced with FRP bars. Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures. Vol. 2 2007. pp. 1077-1084
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