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

Complete text of the article:

Download article (pdf, 0.5MB )

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

References

1. Bayda E.N., Labudin B.V. Ob odnom metode rascheta regulyarnykh ortogonal'nykh perekrestnykh sistem [On a Method for Calculating Regular Orthogonal Cross Systems]. Konstruktsii iz kleenoy drevesiny i plastmass [Structures of Glued Wood and Plastics]. Leningrad, Leningrad Engineering and Construction Institute Publ., 1978, pp. 36–40. (In Russ.)
2. Ignat'ev V.A. Raschet regulyarnykh sterzhnevykh system [Calculation of Regular Frame Structures]. Saratov, Saratov Higher Military School Publ., 1973. 433 p. (In Russ.)
3. Korobko V.I. Ob odnoy “zamechatel'noy” zakonomernosti v teorii uprugikh plastinok [On a “Remarkable” Regularity in the Theory of Elastic Plates]. Stroitel'stvo i arkhitektura, 1989, no. 11, pp. 32–36.
4. Korobko V.I., Turkov A.V. Poperechnye kolebaniya i progiby odnoproletnykh balok, podkreplennykh v prolete uprugimi oporami [Transverse Oscillations and Deflections of Single Beams Reinforced by Elastic Supports in the Span]. Stroitel'naya mekhanika inzhenernykh konstruktsiy i sooruzheniy [Structural Mechanics of Engineering Constructions and Buildings], 2007, no. 1, pp. 53–55.
5. Korobko V.I., Turkov A.V. Sposob opredeleniya zhestkosti vertikal'nogo styka sostavnoy balki [Method for Determining Vertical Joint Stiffness of Composite Beam]. Lesnoy zhurnal [Forestry journal], 2010, no. 1, pp. 88–92.
6. Korobko V.I., Turkov A.V., Boyarkina O.V. Zakonomernosti poperechnogo izgiba i svobodnykh kolebaniy uprugikh balok i plastinok [Regularities of Transverse Bending and Free Oscillations of Elastic Beams and Plates]. Stroitel'naya mekhanika inzhenernykh konstruktsiy i sooruzheniy [Structural Mechanics of Engineering Constructions and Buildings], 2006, no. 4, pp. 64–69.
7. Kutukov V.N. Nekotorye zadachi staticheskogo i dinamicheskogo rascheta regulyarnykh sistem [Some Problems of Static and Dynamic Calculation of Regular Systems]. Raschet prostranstvennykh konstruktsiy. Vyp. 4 [Space Structures Analysis. Iss. 4]. Moscow, Stroyizdat Publ., 1958, pp. 225–238. (In Russ.)
8. Labudin B.V. Vliyanie nekotorykh faktorov na materialoemkost' perekrestno-balochnykh konstruktsiy iz kleenykh derevyannykh elementov [Influence of Some Factors on the Material Intensity of Two-Way Beam Structures Made of Glued Wood]. Issledovanie konstruktsiy iz kleenoy drevesiny i plastmass [Investigation of Structures Made of Glued Wood and Plastics], 1977, no. 1, pp. 89–93.
9. Labudin B.V. K voprosu o raschete perekrestnykh balok iz sbornykh kleenykh derevyannykh elementov s uchetom podatlivosti uzlov [On the Calculation of Two-Way Beams from Precast Glued Wood Units, Taking into Account the Joint Mobility]. Konstruktsii iz kleenoy drevesiny i plastmass [Structures of Glued Wood and Plastics]. Lenin-grad, Leningrad Engineering and Construction Institute Publ., 1979, pp. 65–71. (In Russ.)
10. Labudin B.V. Raschet perekrestnykh sistem s ispol'zovaniem matritsy zhestkosti korobchatogo elementa na uprugo-podatlivykh svyazyakh [Calculation of Cross Systems Using the Stiffness Matrix of a Box-Shaped Element on Elastic-Compliant Constraints]. Konstruktsii iz kleenoy drevesiny i plastmass [Structures of Glued Wood and Plastics]. Len-ingrad, Leningrad Engineering and Construction Institute Publ., 1980, pp. 8–11. (In Russ.)
11. Labudin B.V. Raschet plitno-rebristykh konstruktsiy s uprugo-podatlivymi svyazyami [Calculation of Slab and Ribbed Structures with Elastic-Compliant Constraints]. Lesnoy zhurnal [Forestry journal], 1992, no. 1, pp. 67–72.
12. Labudin B.V., Svetozarova E.I. Prostranstvennye perekrestno-balochnye pokrytiya iz kleenykh derevyannykh elementov [Spatial Two-Way Beam Roofs Made of Glued Wood]. Issledovanie konstruktsiy iz kleenoy drevesiny i plastmass [Investigation of Structures Made of Glued Wood and Plastics], 1977, no. 1, pp. 41–47.
13. Lubo L.N., Mironkov B.A. Plity regulyarnoy prostranstvennoy struktury [Plates of Regular Spatial Structure]. Leningrad, Stroyizdat Publ., 1976. 126 p. (In Russ.)
14. Turkov A.V., Makarov A.A. Progiby i chastoty sobstvennykh kolebaniy sistem perekrestnykh balok na kvadratnom plane s uchetom podatlivosti uzlovykh soedineniy [Deflections and Frequencies of Own Fluctuations of Systems Cross Beams on the Square Plan Taking into Account Pliability of Nodal Connections]. Stroitel'stvo i rekonstruktsiya [Building and Reconstruction], 2013, no. 1, pp. 33–36.
15. Turkov A.V., Marfin K.V. Issledovanie progibov i chastot sobstvennykh kolebaniy sostavnykh kruglykh transtropnykh plastin [Study of Deflection and Natural Vibration Frequencues of Composite Circular Transtropic Plates]. Lesnoy zhurnal [Forestry journal], 2013, no. 4, pp. 66–71.
16. Martin W. Berechnung einer Fachwerkplatte. Wissenschaftliche Zeitschrift der Hochschule fur Bauwesen Leipzig, 1966, Heft 4.
17. Mase P. Analysis of Building Grid Floare. Journal of the Institution of Engineers (India): Civil Engineering Division, 1960, vol. 41, no. 7, part 4.
18. Yettram A.L., Husain H.M. The Representation of a Plate in Flexure by a Grid of Orthogonally Connected Beams. International Journal of Mechanical Sciences, 1965, vol. 7, iss. 4, pp. 243-251.
Received on February 24, 2017