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 language | English |
|---|---|
| Title of host publication | Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures |
| Pages | 1077-1084 |
| Number of pages | 8 |
| Volume | 2 |
| State | Published - Dec 1 2007 |
| Event | 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures - , Italy Duration: Jun 17 2007 → Jun 22 2007 |
Other
| Other | 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures |
|---|---|
| Country | Italy |
| Period | 6/17/07 → 6/22/07 |
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ASJC Scopus subject areas
- Civil and Structural Engineering
- Mechanics of Materials
- Building and Construction
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - Size effect on shear strength of concrete beams reinforced with FRP bars
AU - Marta, F.
AU - Nanni, Antonio
AU - Galati, N.
AU - Mosele, F.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=61849107197&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=61849107197&partnerID=8YFLogxK
M3 - Conference contribution
SN - 9780415446167
VL - 2
SP - 1077
EP - 1084
BT - Proceedings of the 6th International Conference on Fracture Mechanics of Concrete and Concrete Structures
ER -