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Calculation of Joint Stiffness Parameters of the Section Replica of the Vasa Ship
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics. Uppsala University. (Applied Mechanics)ORCID iD: 0000-0003-3384-3971
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Stiffness of joints in wooden structures in cultural heritage is not easily measured in situ, since the application of load may put the object at risk. Instead, replicas of joints can be built and tested mechanically to quantify joint stiffness. The stiffness values are valuable in finite element models of the structures in design of improved structural support systems. In order to establish a simplified but accurate enough model of the 17th century Vasa ship for better preservation, it is essential to determinate the stiffness behavior of the connecting joint between hull and deck beam, which is believed to be semi-rigid due to the degradation of the composing oak-wood and the deformation of wood around the steel bolts. A method based on force and moment equilibrium is proposed to determinate the joint stiffness parameters, and the mechanical behavior of the joint is substituted by some spring elements in the finite element (FE) model of the entire ship. From the FE model of the section of the ship, which was compared and validated with the experimental tests of the full-scale section replica of the Vasa ship, the coefficients of the spring elements are calculated by the undertaken moment and the relative rotation angle between the deck beam and the hull of the ship. The calculated spring stiffnesses generally show similar trend as the replica experiments. The small relative displacement indicates a high stiffness of the joint. Due to the complexity of the joint structure, the value for spring stiffness becomes sensitive to the approximations made during the calculation of the moment and the position of selected nodes to calculate the rotation angle. However, the sensitivity of spring coefficients needs to be tested in term of global deformation of the entire ship. In general, the proposed method describes a scheme that shows how joint stiffness parameters can be estimated for valuable and sensitive structures by way of a joint experimental-numerical approach in a replica of the original components.

Place, publisher, year, edition, pages
2017.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:uu:diva-332822OAI: oai:DiVA.org:uu-332822DiVA: diva2:1154267
Conference
ICEMA 2017: 19th International Conference on Experimental Mechanics and Applications, March 26 - 27, 2017, Madrid, Spain
Available from: 2017-11-02 Created: 2017-11-02 Last updated: 2017-11-10Bibliographically approved

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Afshar, RezaGamstedt, Kristofer

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