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The Experimental Studies of Cross-Beam Systems of Wood Members on a Square Plan when Dynamic and Static Load Variation

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A.V. Turkov, V.I. Korobko, A.A. Makarov

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UDС

624.072.2.011.1

DOI:

10.17238/issn0536-1036.2017.5.119

Abstract

The paper presents the results of experimental studies of the cross-beam system of wood members on a square plan with a change in the rigidity of node connections. We determine the actual compliance of node connections by the results of the experimental and theoretical studies. In the experiment, statistic and dynamic tests are performed, and the maximum deflection and free frequency of the system are obtained. The maximum deflection increases, free frequency of the system decreases when the stiffness of the node connection decreases. We compare the theoretical and experimental data: the experimental deflections and frequencies are greater than the parameters, obtained by means of a calculation. The difference between the experimental and theoretical deflections is 7.54 %, and 0.69 % is in terms of free frequency. The reason for such discrepancies is the fact that the system deformation at high load levels occurs in the nonlinear region due to the high degree of compliance of the system nodes. The difference between theoretical and experimental data reaches 7.97 % for the coefficient connecting base frequency of free transverse vibrations, mass of the structure distributed over the area and the maximum deflection under the action of an evenly distributed load. Based on the study, wet can conclude about fine precision of numerical and experimental deflections and free frequencies, and about the applicability of this experimental coefficient for cross-beam systems.

Authors

A.V. Turkov, Doctor of Engineering Sciences, Head of Department
V.I. Korobko, Doctor of Engineering Sciences, Professor
A.A. Makarov, Postgraduate Student

Affiliation

Prioksky State University, Naugorskoe sh., 29, Orel, 302020, Russian Federation; е-mail: vikor10@mail.ru, aturkov@bk.ru, mak_ar@inbox.ru

Keywords

cross-beam system, testing stand, dynamic test, static test, elasticity modulus, free frequency, maximum deflection

For citation

Turkov A.V., Korobko V.I., Makarov A.A. The Experimental Studies of Cross-Beam Systems of Wood Members on a Square Plan when Dynamic and Static Load Variation. Lesnoy zhurnal [Forestry journal], 2017, no. 5, pp. 119–126. DOI: 10.17238/ issn0536-1036.2017.5.119

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Received on February 24, 2017

The Experimental Studies of Cross-Beam Systems of Wood Members on a Square Plan when Dynamic and Static Load Variation

 

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