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A.G. Chernykh, E.V. Danilov, P.S. Koval Complete text of the article:Download article (pdf, 1.9MB )UDС539.4:539.5DOI:10.37482/0536-1036-2020-4-157-167AbstractThe use of claw washers in dowel connections allows to increase the bearing capacity and stiffness of joints. However, joint action of claw washers and dowels in the structures of advanced materials is studied insufficiently. The paper presents the key failures of existing methods for calculating such connections. Differential equations, that simulate the behavior of a dowel connection with claw washers taking into account the possible changes in the shape of claws, wood moisture content and the duration of loading, are presented. Washer dowel and claw are followed the equations for beams secured on a visco-elastic base, using the equation kernel K(τ,t), which reflects the nonlinearity of the factors affecting the deformation of a connection. The dowel deformation equations are given, which are proposed to be solved by the Bubnov-Galerkin method. The obtained expressions are united into a single equation using the Heaviside step functions. The deformation equations are presented as well. They are written taking into account the virtual displacement of a claw in two orthogonal directions. The expressions allow to pass from calculation of washer claws and a dowel to determination the total bearing capacity and joint stiffness. The possibility of plastification due to the changes in boundary conditions is considered for adequate simulation of connection components behavior upon reaching the plastic stage. The article provides a methodology for determining the theoretical displacements and linear stiffness of a connection. The equations are calculated using dependences available from experiments. In the course of solving the equations, it is possible to determine the values of linear stiffness. These values are compared with the experimental data received earlier to assess the adequacy of the obtained solutions. The distribution of theoretical and experimental data have an average convergence of 91 %, which confirms the validity of the presented methodology for determining the stiffness of dowel connections in LVL with claw washers. The proposed methodology can be recommended for more precise calculation of wooden structures in strength and stiffness, which will reduce their material consumption and enhence reliability.AuthorsA.G. Chernykh, Doctor of Engineering, Head of DepartmentE.V. Danilov, Senior Lecturer; ORCID: https://orcid.org/0000-0002-8919-4600 P.S. Koval, Senior Lecturer AffiliationSaint Petersburg State University of Architecture and Civil Engineering, ul. 2-ya Krasnoarmeyskaya, 4, Saint Petersburg, 190005, Russian Federation; e-mail: chagrig@lan.spbgasu.ru, sleepme@mail.ru, pkoval@lan.spbgasu.ruKeywordsclaw washers, LVL, wooden structures, stiffness, connectionsFor citationChernykh A.G., Danilov E.V., Koval P.S. Stiffness Analysis of Connections of LVL Structures with Claw Washers. Lesnoy Zhurnal [Russian Forestry Journal], 2020, no. 4, pp. 157–167. DOI: 10.37482/0536-1036-2020-4-157-167References1. Glukhikh V.N., Chernykh A.G., Danilov E.V. Wooden Structures Using Claw Washers and Taking Into Account the Initial Stresses of Wood. Saint Petersburg, SPbGASU Publ., 2018. 284 p.2. Danilov E.V. Investigation of Long-Term LVL Strength in Compression by a Cylindric Stamp. Vestnik grazhdanskikh inzhenerov [Bulletin of Civil Engineers], 2014, no. 4(45), pp. 38–42. 3. Danilov E.V. Research of the Short-Term Strength of LVL in Compression by a Triangular Plate. Vestnik grazhdanskikh inzhenerov [Bulletin of Civil Engineers], 2014, no. 1(42), pp. 28–33. 4. Danilov E.V. Determination of Linear Stiffness of Dowel Joints with Claw Rings in the LVL Beam. Vestnik grazhdanskikh inzhenerov [Bulletin of Civil Engineers], 2017, no. 2(61), pp. 81–85. DOI: 10.23968/1999-5571-2017-14-2-81-85 5. Dmitriyev P.A. Studying the LongTerm Bearing Capacity of Wooden Connections on Steel Cylindrical Dowel Pins. Izvestiya vysshikh uchebnykh zavedeniy. Stroitel’stvo i arkhitektura [News of Higher Educational Institutions. Construction], 1973, no. 5, pp. 28–35. 6. Dmitriyev P.A., Strizhakov Yu.D. Studying the Bearing Strength of Wood in the Holes against the Grain under the Action of Temporary and Steady Loads. Izvestiya vysshikh uchebnykh zavedeniy. Stroitel’stvo i arkhitektura [News of Higher Educational Institutions. Construction], 1967, no. 7, pp. 28–35. 7. Dmitriyev P.A., Strizhakov Yu.D. Studying the Wooden Elements of Dowels under the Action of Temporary Loads. Izvestiya vysshikh uchebnykh zavedeniy. Stroitel’stvo i arkhitektura [News of Higher Educational Institutions. Construction], 1969, no. 8, pp. 41–49. 8. Labudin B.V. Improving Laminated Wood Structures with a Spatially Regular Structure. Arkhangelsk, ASTU Publ., 2007. 267 p. 9. Lennov V.G. Industrial Timber Trusses Made with the Use of Claw Washers: Cand. Eng. Sci. Diss. Gorky, 1941. 289 p. 10. Nikitin G.G. Calculation of Dowel Connections with Allowances Made for Deformations Developing in Time: Cand. Eng. Sci. Diss. Leningrad, 1964. 192 p. 11. Popov E.V., Stolypin D.A., Labudin B.V., Melekhov V.I. Stress-Strain State of Panels on a Wooden Frame with Different Variants Joints of Trim. Aktual’nyye napravleniya nauchnykh issledovaniy XXI veka: teoriya i praktika, 2016, vol. 4, no. 5-2(25-2), pp. 133-139. 12. Purtov V.V., Pavlik A.V. Calculation in the ANSYS Program of Wooden Structures with Fasteners of Increased Bearing Capacity. Proceedings of the VII International Symposium “Actual Problems of Computational Simulation in Civil Engineering (APCSCE 2018)”, Novosibirsk, July 1–8, 2018. Novosibirsk, NSUACE (SIBSTRIN) Publ., 2018, p. 72. 13. Rabotnov Yu.N. Creeping of Structural Elements. Moscow, Nauka Publ., 1966. 752 p. 14. Association Standard of Wooden House Construction StADD-3.2.–2011. Wooden Structures. Joining Wooden Elements Using Connector Plates. Saint Petersburg, 2012. 59 p. 15. Sheshukova N.V. Bearing Capacity and Deformability of the Dowel Connections of Wooden Structures when Subjected to Cyclic Loadings: Cand. Eng. Sci. Diss. Saint Petersburg, 2001. 152 p. 16. Blass H.J., Aune P., Choo B.S., Gorlacher R., Griffiths D.R., Hilson B.O. et al. Timber Engineering STEP 1: Basis of Design, Material Properties, Structural Components and Joints. Almere, Netherlands, Centrum Hout, 1995. 300 p. 17. Blass H.J., Schlager M. Trial Calculations for Determination of the LoadCarrying Capacity of Joints with Bulldog Connectors. CEN/TC 124/WG4 N23, 1993. 6 p. 18. Blaß J.H., Ehlbeck J., Schlager M. Characteristic Strength of Tooth-Plate Connector Joints. Holz als Roh und Werkstoff [European Journal of Wood and Wood Products], 1993, vol. 51, pp. 395–399. DOI: 10.1007/BF02628236 19. Eurocode 5: Design of Timber Structures. Part: General Rules and Rules for Buildings. ENV 1995-1-1. Brussels, CEN, 1993. 133 p. 20. Hirashima Y. Lateral Resistance of Timber Connector Joints Parallel to Grain Direction. Proceedings of the International Engineering Conference. Tokyo, 1990, vol. 1, pp. 254–261. 21. Lißner K., Rug W., Steinmetz D. DIN 1052:2008Ǧ12 Neue Grundlagen für Entwurf, Berechnung und Bemessung von Holzbauwerken – Teil 5(2): Aussteifungen von Holztragwerken (Fortsetzung aus Heft 7/09 und Schluss). Bautechnik, 2009, vol. 86, iss. 8, 490–505. DOI: 10.1002/bate.200910051 22. Mettem C.J., Page A.V. Davis G. Validatory Tests and Proposed Design Formulae for the Load-Carrying Capacity of Toothed-Plate Connectored Joints. Papers of the 26th Meeting of the Working Commission W18 – Timber Structures, Athens, GA, USA, August, 1993. Germany, Universität Karlsruhe, 1994, CIB-W18 Paper 26-7-2. 25 p. 23. Standard NEN 3852:1973 nl. Technische grondslagen voor de berekening van bouwconstructies – TGB 1972 – Hout – Houtconstructies [Regulations for the Calculation of Building Structures – Timber Structures]. Netherlands, 1973. 131 p. Received on August 30, 2019 Stiffness Analysis of Connections of LVL Structures with Claw Washers |
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