TY - JOUR
T1 - Strut-and-tie method for externally bonded FRP shear-strengthened large-scale RC beams
AU - Godat, Ahmed
AU - Chaallal, Omar
N1 - Funding Information:
The financial support of the National Science and Engineering Research Council of Canada, the Fonds Québécois de la Research sur la Nature et les Technologies (FQRNT), and the Ministère des Transports du Québec (MTQ) through operating grants is gratefully acknowledged.
PY - 2013/5
Y1 - 2013/5
N2 - The main objective of this study is to evaluate the effectiveness of the strut-and-tie method (STM) in predicting the capacity of shear-strengthened large-scale beams with externally bonded (EB) and carbon fibre reinforced polymers (CFRPs). The STM approach is validated with 14 specimens shear-strengthened with a U-wrap scheme. The test specimens are grouped into four series on the basis of the spacing between their steel stirrups: 140, 203, 406 and 610. mm. Each series of girders includes a control specimen, with no external CFRP for shear strengthening, and specimens strengthened with one, two, and for the second and fourth series, three layers of CFRP. A practical analysis and detailed design for the CFRP shear-strengthened girders using the STM is presented. In the method, externally bonded CFRP strips on a CFRP shear-strengthened RC member can act as additional tension ties. The tensile forces in the steel stirrups and the CFRP laminates are combined according to a proposed equation. The results obtained using the STM are compared with the experimental results as well as the Canadian Bridge Design code (CSA-S6-06). The STM analysis approach, without considering the safety factor proposed by the ACI, shows its capability to predict the loading capacities of FRP shear-strengthened large-scale beams with good accuracy.
AB - The main objective of this study is to evaluate the effectiveness of the strut-and-tie method (STM) in predicting the capacity of shear-strengthened large-scale beams with externally bonded (EB) and carbon fibre reinforced polymers (CFRPs). The STM approach is validated with 14 specimens shear-strengthened with a U-wrap scheme. The test specimens are grouped into four series on the basis of the spacing between their steel stirrups: 140, 203, 406 and 610. mm. Each series of girders includes a control specimen, with no external CFRP for shear strengthening, and specimens strengthened with one, two, and for the second and fourth series, three layers of CFRP. A practical analysis and detailed design for the CFRP shear-strengthened girders using the STM is presented. In the method, externally bonded CFRP strips on a CFRP shear-strengthened RC member can act as additional tension ties. The tensile forces in the steel stirrups and the CFRP laminates are combined according to a proposed equation. The results obtained using the STM are compared with the experimental results as well as the Canadian Bridge Design code (CSA-S6-06). The STM analysis approach, without considering the safety factor proposed by the ACI, shows its capability to predict the loading capacities of FRP shear-strengthened large-scale beams with good accuracy.
KW - Analytical results
KW - CFRP
KW - Experimental tests
KW - Reinforced concrete large-scale beams
KW - Shear strengthening
KW - Strut-and-tie method
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U2 - 10.1016/j.compstruct.2012.11.034
DO - 10.1016/j.compstruct.2012.11.034
M3 - Article
AN - SCOPUS:84874312883
SN - 0263-8223
VL - 99
SP - 327
EP - 338
JO - Composite Structures
JF - Composite Structures
ER -