Effect of web configuration and flange type on bending strength of I-joist beams | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| Article 10, Volume 34, Issue 2 - Serial Number 67, August 2019, Pages 263-275 PDF (862.03 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijwpr.2019.126617.1549 | ||
| Authors | ||
| Morteza Nazerian* 1; Alireza Rezaian2; Mohamma Shamsiyan2 | ||
| 1Shahid Beheshti University | ||
| 2University of Zabol | ||
| Abstract | ||
| Bending strength of I-joist lightened via two methods of crinkleing and honeycombing using poplar species (Popolus deltoids) and eucalyptus (Eucalyptus spp) was studied. Investigated variables consisted of: a) type of flange, b) configuration of lightened core layer in web and c) thermal-pressure treatment surface layers of web. Flange type at two levels: 1) LVL from poplar wood and 2) eucalyptus massive wood, configuration of web core layer at two level too: 1) crinkle and 2) honeycomb and type of treatment applied on surface layers of web which were prepared from poplar layies with 3 mm thick at two levels: 1) thrmo-compressed treated and 2) untreated veneers were selected. Mechanical properties of beam consisted of modulus of rapture (MOR) and modulus of elasticity (MOE) were selected and tested as dependent variables. Obtained results were analyzed in full factorial plot, statistically. After determination of results significance results, means of values were classified by Duncan Multiple Range Test (DMRT). Results showed that using LVL from poplar unlike its low density had higher MOR and MOE values compared with eucalyptuse massive wood. Besides, in order to lighten beam, using honeycomb configuration in web core layer gave more strength to beam in comparison with crinkle configuration. Treatment of surface layers of web had not effect on bending strength, statistically. | ||
| Keywords | ||
| I-joist beam; flange; web; crinkle; honeycomb; thermal-compress treatment | ||
| References | ||
|
-Ardalany, M., Fragiacomo, M., Carradine, D., and Mos, P., 2013. Experimental behavior of Laminated Veneer Lumber (LVL) joists with holes and different methods of reinforcement. Engineering Structures, 56: 2154–2164. -Baylor, G., and Harte, A.M., 2013. Finite element modelling of castellated timber I-joists. Construction and Building Materials, 47: 680-688. -Breyer, D., Cobeen, k., Fridley, K., and Pollock, D., 2015. Design of woodstructures—ASD/LRFD. New York: McGraw-Hill Education. -Candan, Z., Buyuksari, U., Korkut, S., Unsal, O., and Cakicier, N., 2014. Surface Characteristics of Thermally Modified Plywood Panels. Proceedings of the 57th International Convention of Society of Wood Science and Technology June 23-27, 2014 - Zvolen, SLOVAKIA. -Harte, A.M. and Baylor, G., 2011. Structural evaluation of castellated timber I-joists, Engineering Structures, 33: 3748-3754. -Lagaros, N.D., Psarras, L.D., Papadrakakis, M., and Panagiotou, G., 2008. Optimum design ofsteel structures with web openings. Engineering Structure, 30: 2528–37. -Leckie, F.A., and Dal Bello, D.J., 2009. Strength and Stiffness of Engineering Systems, Mechanical Engineering Series, 696 p. -Malekzadeh Fard, K., Ebrahimi, M., Nazari, A., and Irani S., 2011. Buckling Analysis of composite sandwich panel with symmetric FGM core, using improved high-order theory. AerospaceMechanicsJournal, 8(1): 55-70. -Morrissey, G.C., Dinehart, D.W., and Dunn, W.G., 2009. Wood I-joists with excessive web openings: an experimental and analytical investigation. ASCE Journal of Structure and Engineering, 135(6):655–65. -McGraw, B., Denes, L., Lang, E.M., Davalos, J.F., Chen, A., Song, G., and Malla, R.B., 2010. Development of a Corrugated Wood Composite Web Panel for I-Joist from Discarded Veneer-Mill Residues. In Proceedings of the 12th ASCE Aerospace Division International Conference on Engineering, Construction and Operations in Challenging Environments, Honolulu, Hawaii pp. 452-462. -Morris, V., Gustafsson, P.J. and Serrano, E., 1995. The shear strength of light-weight beams with and without a hole - a preliminary study. COST 508 -Wood Mechanics Proc. of the 1995 Wood Mechanics Workshop on Mechanical Properties of Panel Products. Watford, UK. -Nazerian, M., 2013. The lamination influence on properties of agro-based particleboard. Wood Material Science and Engineering, 8(2): 129-138. -Nazerian, M., Moazami, V., Mohebbi Gargari, R., 2016. The effect of core layer treatment and almond shell powder content in the glue line on the pull off adhesion of sandwich panel. Iranian Journal of Wood and Paper Science Research, 31(1): 141-153. -Sivonen, H., Maunu, S., Sundholm, F., Jamsa, S., and Viitaniemi, P., 2002. Magnetic resonance studies of thermally modified wood. Holzforschung, 56:648–54. -Vick, C.B., 1999. Chapter 9: Adhesive Bonding of Wood Materials. Forest Products Laboratory. 1999. Wood handbook—Wood as an engineering material. Gen. Tech. Rep. FPL–GTR–113. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 463 p. -Wang, X., Ross, R.J., Brashaw, B.K., Verhey, S.A., Formsan, J.W., and Ericson, J.R., 2003. Flexural properties of laminated veneer lumber manufactured from ultrasonically rated red maple veneer. Forest Product Laboratory, FPL-RN-0288. -Wang, S., and Cheng, J.J.R., 1995. Shear behaviour of OSB wood composite I-beams with webopenings. Rep. submitted to Canadian Forest Service, Dept. of Civil Eng, Univ.of Alberta, Edmonton, Ala, Canada, 1995. -Winandy, J.E., and Lebow P.K., 2001. Modeling strength loss in wood by chemical composition. Part i. an individual component model for southern pine. Wood and Fiber Scince, 33:239–54. -Boonstra, M. J., and Boke, T., 2006. Chemical analysis of heat treated softwoods. Holz als Roh- und Werkst, 64:204–11. -Zhu, E.C., Guan, Z.w., Rodd, P.D., and Pope, D.J., 2005. Finite element modelling of OSB webbed timber I-beams with interactions between openings. Advances in Engineering Software, 36: 797–805. | ||
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