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Considerable errors caused by shear deflection and rotary inertia in both-ends clamped flexural vibration make the modulus of elasticity hardly obtainable in flexurally excited beams with similar ending conditions. As both-ends clamped beams and columns are necessarily quality controlled in situ within the building structures. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2013) 37: 121-125 © TÜBİTAK doi:10.3906/tar-1111-22 http://journals.tubitak.gov.tr/agriculture/ Research Article Free vibration of both-ends clamped wooden beams: is it potentially applicable as an in situ assessment method? 1, 1 1 2 1 Mehran ROOHNIA *, Abdolsaber YAGHMAEIPOUR , Yoshitaka KUBOJIMA , Ajang TAJDINI Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran 2 Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan Received: 14.11.2011 Accepted: 28.05.2012 Published Online: 15.01.2013 Printed: 15.02.2013 Abstract: Considerable errors caused by shear deflection and rotary inertia in both-ends clamped flexural vibration make the modulus of elasticity hardly obtainable in flexurally excited beams with similar ending conditions. As both-ends clamped beams and columns are necessarily quality controlled in situ within the building structures, this study has attempted to identify some initial requirements for the dynamic responses of a sound both-ends clamped beam under flexural vibration. Accordingly, the dynamic responses of the both-ends clamped wooden beams in radial and tangential flexural vibration were compared to beams in a free-free condition while stepwise increasing axial compressions were applied to the beams. Both-ends clamped beams had the potential to be subjected to in situ longitudinal Young’s modulus evaluations. The strong correlations among both-ends clamped and free-free beams in terms of evaluated moduli verified the possibility. Key words: Assessment, beam, clamped, structure, vibration, Young’s modulus 1. Introduction Most wooden structural components in forms of beams and columns are situated in both-ends clamped conditions. In timber constructions, the load-bearing components may lose their efficiencies due to gradual deterioration or natural, biological, and mechanical damages. Frequent .
