Design of Timber Single-Span Beam with Steel Reinforcement

Abstract:

Vital problem, occurring in the operation process of structures such as timber beams, is the increase of their bearing capacity and span length with keeping their height. One of the possible ways to solve this problem is steel reinforcement of such structures. The aim of the research work is to show possibility of increasing bearing capacity of single-span reinforced timber beams and develop the main points of calculation and design of such structures. The beam is reinforced symmetrically by 2 rods d28 with both sides with A_r=24.63 cm² (4d28 A300). The reinforcement is placed in compressed and stretched areas. Reinforced timber structures are designed on two groups of limit conditions. Design on the first limit condition (normal and tangential stress) is made using geometric characteristics of rectangular section of reinforced timber beam. Design on the second limit condition is made taking onto account the timber elastic nodule and inertia moment for reinforced timber beam. The main features of joint work of timber and reinforcement, which can increase operation reliability of bearing structures, are shown in the research work.

• Periodical: Materials Science Forum (Volume 972)
• Pages: 111-117
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.972.111
• Online since: October 2019
• Authors: Farid A. Boytemirov, Dmitry D. Koroteev*, Makhmud Kharun
• Keywords: Bearing Capacity, Operation Reliability, Span Length, Steel Reinforcement, Timber-Steel Beam

References

[1] Asdrubali F., Ferracuti B., Lombardi L., Guattari C., Evangelisti L., Grazieschi G.: A review of structural, thermo-physical, acoustical, and environmental properties of wooden materials for building applications. Building and Environment, vol. 114 (2017), pp.307-332.

DOI: 10.1016/j.buildenv.2016.12.033

[2] K.C. Cheung: Wooden Structures. Reference Module in Materials Science and Materials Engineering (USA 2016).

[3] D.D. Koroteev, F.A. Boytemirov, N.A. Stashevskaya: The strength research of the adhesive joints of sheet structures. Journal of Fundamental and Applied Sciences, vol. 9(7S) (2017), pp.414-424.

[4] A. Cavalli, M. Malavolti, A. Morosini, A. Salvini, M. Togni: Mechanical performance of full scale steel-timber epoxy joints after exposure to extreme environmental conditions. International Journal of Adhesion and Adhesives, vol. 54 (2014), pp.86-92.

DOI: 10.1016/j.ijadhadh.2014.05.005

[5] V. De Luca, C. Marano: Prestressed glulam timbers reinforced with steel bars. Construction and Building Materials, vol. 30 (2012), pp.206-217.

DOI: 10.1016/j.conbuildmat.2011.11.016

[6] T. Reynolds, R. Harris, W. Chang: Nonlinear pre-yield modal properties of timber structures with large-diameter steel dowel connections. Engineering Structures, vol. 76 (2014), pp.235-244.

DOI: 10.1016/j.engstruct.2014.07.010

[7] M. Audebert, D. Dhima, M. Taazount, A. Bouchair: Numerical investigations on the thermo-mechanical behavior of steel-to-timber joints exposed to fire. Engineering Structures, vol. 33(12) (2011), pp.3257-3268.

DOI: 10.1016/j.engstruct.2011.08.021

[8] M.A. Bradford, A. Hassanieh, H.R. Valipour, S.J. Foster: Sustainable Steel-timber Joints for Framed Structures. Procedia Engineering, vol. 172 (2017), pp.2-12.

DOI: 10.1016/j.proeng.2017.02.011

[9] J. Custodio, J. Broughton, H. Cruz: A review of factors influencing the durability of structural bonded timber joints. International Journal of Adhesion and Adhesives, vol. 29(2) (2009), pp.173-185.

DOI: 10.1016/j.ijadhadh.2008.03.002

[10] N. Gattesco, A. Gubana, M. Buttazzi, M. Melotto: Experimental investigation on the behavior of glued-in rod joints in timber beams subjected to monotonic and cyclic loading. Engineering Structures, vol. 147 (2017), pp.372-384.

DOI: 10.1016/j.engstruct.2017.03.078

[11] V. Di Maria, L. D'Andria, G. Muciaccia, A. Ianakiev: Influence of elevated temperature on glued-in steel rods for timber elements. Construction and Building Materials, vol. 147 (2017), pp.457-465.

DOI: 10.1016/j.conbuildmat.2017.04.038

[12] C. Sandhaas, J.G. van de Kuilen: Strength and stiffness of timber joints with very high strength steel dowels. Engineering Structures, vol. 131 (2017), pp.394-404.

DOI: 10.1016/j.engstruct.2016.10.046

[13] GOST 34028-2016, Reinforcing rolled products for reinforced concrete constructions. Specifications, Moscow, Russia, 2016. URL: http:// http://docs.cntd.ru/document/1200144936.

[14] J. Kim, D. Park, C. Lee, K. Park, J. Lee: Effects of cryogenic thermal cycle and immersion on the mechanical characteristics of phenol-resin bonded plywood. Cryogenics, vol. 72(1) (2015), pp.90-102.

DOI: 10.1016/j.cryogenics.2015.09.007

[15] SP 64.13330.2017, Timber structures, Moscow, Russia, 2017. URL: http:// http://docs.cntd.ru/document/456082589.