Development of Reinforcing Bars in SRCC Matrix: Modeling and Interpretation
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
Experiments on deformed reinforcing bar anchorages developed in strain-resilient cementitious composites (SRCCs) with high tensile deformation capacity illustrate that the bar-matrix assembly may respond in a ductile manner marked by pullout failure with no cover splitting—even in the absence of external confinement. This ductile bond-slip response is owing to the extremely high tensile fracture energy of the matrix, which is attributed to the reinforcing action of the dispersed microfibers in the cementitious matrix. This enhances the associated bond-slip law with higher strength and a slowly descending branch, very similar in form to the response curve of confined anchorages that demonstrate ductile, resilient response. To understand and model the structural response of an elastic bar anchorage in a SRCC matrix, the analytical solution of the field equations that govern the bond problem are established with reference to the entire range of the bond-slip law up to large levels of slip, including the postpeak descending branch, which quantifies the fracture energy of the matrix. The accuracy of the mathematical solution is verified through correlation with laboratory evidence, benchmark finite-element analysis examples, and numerical solutions of the discretized problem. The mathematical solution is used in order to conduct a parametric investigation that accounts both for the bond toughness and the anchorage geometry, to illustrate their significance as prerequisite for development of high-strength reinforcement.
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Acknowledgments
This research has been partly cofinanced by the European Union [European Social Fund (ESF)] and Greek national funds through the operational program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF), Research Funding Program: Thales, Democritus University of Thrace, Center for Multifunctional Nanocomposite Construction Materials (MIS 379496). The third author acknowledges the support of the University of Cyprus.
References
Bandelt, M. J., and Billington, S. L. (2014a). “Bond behavior of steel reinforcement in high-performance fiber-reinforced cementitious composite flexural members.” Mater. Struct., 49(1–2), 71–86.
Bandelt, M. J., and Billington, S. L. (2014b). “Monotonic and cyclic bond-slip behavior of ductile high-performance fiber-reinforced cement-based composites.” 3rd Int. RILEM Conf. on Strain Hardening Cementitious Composites (SHCC3-Delft), RILEM Publications SARL, Paris, 393–400.
Chao, S. H. (2005). “Bond characterization of reinforcing bars and prestressing strands in high performance fiber reinforced cementitious composites under monotonic and cyclic loading.” Ph.D. dissertation, Univ. of Michigan, Ann Arbor, MI.
Chao, S. H., Naaman, A. E., and Parra-Montesinos, G. J. (2009). “Bond behavior of reinforcing bars in tensile strain-hardening fiber-reinforced cement composites.” ACI Struct. J., 106(6), 897–906.
Chao, S.-H., Naaman, A. E., and Parra-Montesinos, G. J. (2010). “Local bond stress-slip models for reinforcing bars and prestressing strands in high-performance fiber reinforced cement composites (HPFRCCs).” ACI SP-272 Antoine E. Naaman Symp.—Four Decades of Progress in Prestressed Concrete, FRC, and Thin Laminate Composites, American Concrete Institute, Farmington Hills, MI, 151–172.
Cosenza, E., Manfredi, G., and Realfonzo, R. (2002). “Development length of FRP straight bars.” Compos. Part B, 33(7), 493–504.
De Larrald, F., Schaller, I., and Fuchs, J. (1993). “Effect of the bar diameter on the bond strength of passive reinforcement in high-performance concrete.” ACI Mater. J., 90(4), 333–339.
Eligehausen, R., Popov, E., and Bertero, V. (1983). “Local bond stress-slip relationships of deformed bars under generalized excitations.”, Univ. of California, Berkeley, CA.
fib (International Federation for Structural Concrete). (2010). Model Code 2010—Final draft, Vol. 1, Lausanne, Switzerland.
Fischer, G., and Li, V. C. (2002). “Effect of matrix ductility on deformation behavior of steel-reinforced ECC flexural members under reversed cyclic loading conditions.” ACI Struct. J., 99(6), 781–790.
Georgiou, A. V., and Pantazopoulou, S. J. (2016). “Effect of fiber length and surface characteristics on the mechanical properties of cementitious composites.” Constr. Build. Mater., 125, 1216–1228.
Kanakubo, T., and Hosoya, H. (2015). “Bond-splitting strength of reinforced strain-hardening cement composite elements with small bar spacing.” ACI Struct. J., 112(2), 189–198.
Karatzaferis, V. (2009). “Analysis of the mechanical behavior of FRP reinforced concrete structural elements.” Ph.D. thesis, Laboratory of Structural Mechanics, National Technical Univ. of Athens, Athens, Greece.
MATLAB [Computer software]. MathWorks, Natick, MA.
Pecce, M., Manfredi, G., Realfonzo, R., and Cosenza, E. (2001). “Experimental and analytical evaluation of bond properties of GFRP bars.” J. Mater. Civ. Eng., 282–290.
Polak, M. A., and Killen, D. T. (1998). “The influence of the reinforcing bar diameter on the behavior of members in bending and in-plane tension.” ACI Struct. J., 95(5), 471–479.
SAP2000 [Computer software]. Computers and Structures, Inc., Berkeley, CA.
Soroushian, P., and Choi, K. (1989). “Local bond of deformed bars with different diameters in confined concrete.” ACI Struct. J., 86(2), 217–222.
Tastani, S. P., Konsta-Gdoutos, M., Pantazopoulou, S. J., and Balopoulos, V. (2016). “The effect of carbon nanotubes and polypropylene fibers on bond of reinforcing bars in strain resilient cementitious composites.” Springer Front. Struct. Civ. Eng., 10(2), 214–223.
Tastani, S. P., and Pantazopoulou, S. (2010). “Direct tension pullout bond test: Experimental results.” ASCE J. Struct. Eng., 731–743.
Tastani, S. P., and Pantazopoulou, S. J. (2006). “Bond of G-FRP bars in concrete: Experimental study and analytical interpretation.” ASCE J. Compos. Construct., 381–391.
Tastani, S. P., and Pantazopoulou, S. J. (2013). “Reinforcement-concrete bond: State determination along the development length.” ASCE J. Struct. Eng., 1567–1581.
Tastani, S. P., Pantazopoulou, S. J., Konsta-Gdoutos, M. S., and Balopoulos, V. (2014). “Experimental local bond of reinforcing bars in cementitious composites reinforced with polypropylene fibers/carbon nanotubes.” Proc., SHCC3-Delft, RILEM Publications SARL, Paris.
Yankelevsky, D. Z., and Jabareen, M. (2005). “Analysis of 1-D tension stiffening with discrete cracks.”, American Concrete Institute, Farmington Hills, MI, 55–82.
Yerlici, V., and Özturan, T. (2000). “Factors affecting anchorage bond strength in high-performance concrete.” ACI Struct. J., 97(3), 499–507.
Zhang, R., Matsumoto, K., Hirata, T., Ishizeki, Y., and Niwa, J. (2015). “Application of PP-ECC in beam–column joint connections of rigid-framed railway bridges to reduce transverse reinforcements.” Eng. Struct., 86, 146–156.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 10, 2016
Accepted: Mar 16, 2017
Published online: Jun 10, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 10, 2017
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