Abstract
A simultaneous crack extension pull-out model for post-installed anchor bar is presented. The anchor bar is such that used in various strengthening techniques to strengthen reinforced concrete structures. The properties of the infill material used for post-installed anchor bar are characterized by a nonlinear interface between the surrounding concrete and the anchor bar. This is a new type of anchor-infill assembly in which the infill material is divided into two layers for the purpose of providing a larger failure path length resulting in increase of the energy absorption and pull-out load capacity. The mechanical properties of the infill layer are different from the surrounding concrete. Therefore the existing pull-out model of deformed bars cannot be applied directly in this case. The interfacial de-bonding is examined by the strength criterion expressed in terms of interfacial shear stress. Pre-existing cracks representing artificial notches are assumed at the top of infill layers for identifying crack location and stabilizing its propagation direction. All the possibilities associated with two-cracks in the close vicinity have been investigated in detail. The objective of the analysis is to predict a set of material properties which result in simultaneous crack extension at the two interfaces and also to identify a simultaneous crack extension length which results in increasing the pull-out load capacity, increase in energy absorption and increased failure path length but achieved at lowest increase in pull-out deformation thereby proving the effectiveness of two-layer model. Limiting the pull-out deformation is desirable from the point of view of limiting damage.
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Ishibashi, T. and Tsukishima, D. (2009). “Seismic damage of and seismic rehabilitation techniques for railway reinforced concrete structures.” Journal of Advanced Concrete Technology, Vol. 7, No. 3, pp. 287–296.
Ishibashi, T., Tsuyoshi, T., and Kobayashi, K. (2004). “Seismic retrofitting methods newly developed for railway concrete structures.” Journal of Advanced Concrete Technology, Vol. 2, No. 1, pp. 65–76.
Ishida, M., Yoshida, T., and Noguchi, H. (1991). “Parallel array of semielliptical surface cracks in semi-infinite solid under tension.” Journal of Engineering Fracture Mechanics, Vol. 39, No.5, pp. 845–850.
Kamaya, M. (2003). “A crack growth evaluation method for interacting multiple cracks.” JSME International Journal, Vol. 46, No. 1, pp. 15–23.
Leek, T. H. and Howard, L. C. (1996). “An examination of methods of assessing interacting surface cracks by comparison with experimental data.” International Journal of Vessel and Piping, Elsevier Science Limited, Vol. 68, No. 1, pp. 181–201.
Moussa, A. W., Bell, R., and Tan, L. C. (1999). “The interaction of two parallel semi-elliptical surface cracks under tension and bending.” Journal of Pressure Vessel Technology, Vol. 121, No. 1, pp. 323–326.
Naaman, A. E., Namur, G. G., Alwan, J. M., and Najm, H. S. (1991). “Fiber pullout and bond slip. I: Analytical study.” Journal of Structural Engineering, Vol. 117, No.. 9, pp. 2769–2790.
Saleem, M. and Tsubaki, T. (2009). “Influence of mechanical properties of infilled materials on pull-out behavior of post-installed anchor bar.” Proc. of JSCE Eleventh International Summer Symposium, Japan, Vol. 49, No. 6, pp. 237–240.
Saleem, M. and Tsubaki, T. (2010). “Multi-layer model for pull-out behavior of post-installed anchor.” Proc. FRAMCOS-7, Fracture Mechanics of Concrete Structures, AEDIFICATIO publishers, Germany, Vol. II, pp. 823–830.
Saleem, M. and Tsubaki, T. (2012). “Two-layer model for pull-out behavior of post-installed anchor.” J. Materials, Conc. Struct. Pavements, JSCE, Vol. 68, No. 1, pp. 49–62.
Shu, M. H., Petit, J., and Bezine, G. (1994). “Stress Intensity factors for several groups of equal and parallel cracks in finite plates.” Journal of Engineering Fracture Mechanics, Vol. 49, No. 6, pp. 933–941.
Sugiyama, N., Tsubaki, T., and Hayashi, K. (2006). “Pull-out model of anchor bars of flexural members under reversed cyclic loading.” Proc. of the Japan Concrete Institute, Vol. 28, No. 2, pp. 1117–1122.
Sumitro, S. and Tsubaki, T. (1998). “Micromechanical fiber pullout model for steel fiber reinforced concrete.” J. Materials, Conc. Struct. Pavements, JSCE, Vol. 40, No. 599, pp. 155–163.
Wang, Y. Z., Atkinson, J. D., Akid, R., and Parkins, R. N. (1996). “Crack interaction, coalescence and mixed mode fracture mechanics.” Fatigue & Fracture of Engineering Materials & Structure, Vol. 19, No. 1, pp. 51–63.
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Saleem, M., Qazi, A.U., Hameed, A. et al. A multi-layer parallel crack extension model for deformational response of post-installed anchor. KSCE J Civ Eng 17, 908–920 (2013). https://doi.org/10.1007/s12205-013-0014-9
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DOI: https://doi.org/10.1007/s12205-013-0014-9