Bond Behavior between Softwood Glulam and Epoxy Bonded-In Threaded Steel Rod
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 3
Abstract
This study aims to develop an improved understanding of the interfacial bond behavior of softwood glulam joints with bonded-in threaded steel rod. A total of 39 glulam joints with bonded-in single-threaded steel rods were tested to failure in the pull-pull configuration. The test results were presented in term of failure modes, load-relative movement response, pullout strength, and the corresponding slip. The distributions of bonded-in rod axial strain, interfacial bond stress, and relative movement were also analyzed to evaluate the local bond stress–relative movement response in the bond line. The results confirmed that the bond-relative movement response is dependent on the locations along the anchorage length, and the bond-relative movement responses located near both the loaded end and the anchorage end were observed to be stiffer than those at other locations. Finally, the predictions for the load capacity of the glulam joints with bonded-in threaded steel rod were carried out based on several existing empirical formulas.
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Acknowledgments
The financial support from the National Science Foundation for Young Scholars of China (Grant No. 51108233) is gratefully acknowledged. The China Scholarship Council (CSC) program is kindly appreciated for offering financial supports for the theoretical analysis of this paper at the University of British Columbia, Canada.
References
Aicher, S., Höfflin, L., and Wolf, M. (1998). “Influence of specimen geometry on stress distributions in pull-out tests of bonded in steel rods in wood.” Otto-Graf-J., 9, 205–217.
ASTM. (2004). “Standard test methods for small clear specimens of timber.” ASTM D143-09, West Conshohocken, PA.
ASTM. (2006). “Standard test methods for mechanical fasteners in wood.” ASTM D1761-2006, West Conshohocken, PA.
Bengtsson, C., and Johansson, C. J. (2001). “GIROD—Glued-in rods for timber structures.”, SP Swedish National Testing and Research Institute, Borås, Sweden.
Broughton, J. G., and Hutchinson, A. R. (2001). “Effect of timber moisture content on bonded-in rods.” Constr. Build Mater., 15(1), 17–25.
CEN (Comite Europeen de Normalisation). (2002). “Moisture content of a piece of a sawn timber—Part 1: Determination by oven dry method.” BS EN 13183–1, Brussels, Belgium.
Gardelle, V., and Morlier, P. (2007). “Geometric parameters which affect the short term resistance of an axially loaded bonded-in rod.” Mater. Struct. J., 40(1), 127–138.
Hong, X. J. and Zhang, X. (2000). “The fitting method of the smooth bond stress in the bond-slip test.” Struct. Eng., 3(11), 44–48 (in Chinese).
Jensen, J. L. (2001). “Axially loaded bonded in hardwood dowels.” Wood Sci. Tech., 35(1–2), 73–83.
Ling, Z. B, et al. (2014). “Pull-out strength and bond behaviour of axially loaded rebar glued-in glulam.” Constr. Build Mater., 65, 440–449.
Malczyk, R. (1993). “Bonded in re-bar connection.” Master’s thesis, Univ. of British Columbia, Vancouver, Canada.
Martín Gutiérrez, E., Estévez Cimadevila, J., and Otero Chans, D. (2013). “Influence of geometric and mechanical parameters on stress states caused by threaded rods glued in wood.” Eur. J. Wood. Prod., 71(2), 259–266.
Otero Chans, D., Estévez Cimadevila, J., and Martín Gutiérrez, E. (2010). “Strength of joints with epoxy-glued threaded steel rods in tail timber.” J. Mater. Civ. Eng., 453–458.
Rossignon, A., and Espion, B. (2008). “Experimental assessment of the pull-out strength of single rods bonded in glulam parallel to the grain.” Holz als Roh-zùnd Werkstoff, 66(6), 419–432.
Serrano, E. (2001a). “Glued-in rods for timber structures—A 3D model and finite element parameter studies.” Int. J. Adhes. Adhes., 21(2), 115–127.
Serrano, E. (2001b). “Glued-in rods for timber structures—An experimental study of softening behaviour.” Mater. Struct. J., 34(4), 228–234.
Standards Press of China. (2000). “Mechanical properties of fasteners bolts, screws and studs.”, Beijing.
Steiger, R., Gehri, E., and Widmann, R. (2006). “Pull-out strength of axially loaded steel rods bonded in glulam parallel to the grain.” Mater. Struct. J., 40(1), 69–78.
Volkersen, O. (1938). “Die Nietkraftverteilung in zugbeanspruchten Nietverbindungen mit konstanten Laschenquerschritten.” Luftfahrtforschung, 15, 41–47.
Wiktor, R. (1994). “Glulam connections using epoxy bonded in rebars.” Master’s thesis, Univ. of British Columbia, Vancouver, Canada.
Wu, Y. F., and Jiang, C. (2013). “Quantification of bond-slip relationship for externally bonded FRP-to-concrete joints.” J. Compos. Constr., 673–686.
Yeboah, D., Taylor, S., McPolin, D., and Gilfillan, R. (2013). “Pull-out behaviour of axially loaded basalt fibre reinforced polymer (BFRP) rods bonded perpendicular to the grain of glulam elements.” Constr. Build Mater., 38, 962–969.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 2, 2015
Accepted: Jul 28, 2015
Published online: Sep 18, 2015
Discussion open until: Feb 18, 2016
Published in print: Mar 1, 2016
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