Rotational Stiffness and Carrying Capacity of Timber Frame Corners with Dowel Type Connections

Abstract

With the development of wooden structures and buildings, there is a need to research physical and numerical tests of wood-based structures. The presented research is focused on construction and computational approaches for new types of joints to use in wooden structures, particularly glued lamella elements made of wood and wood-based composites. This article focuses on improving the frame connection of a wooden post and a beam with the use of fasteners to ensure better load-bearing capacity and stiffness of the structure. In common practice, bolts or a combination of bolts and pins are used for this type of connection. The aim is to replace these commonly used fasteners with modern ones, namely full thread screws. The aim is also to shorten and simplify the assembly time in order to improve the load-bearing capacity and rigidity of this type of frame connection. Two variations of the experimental test were tested in this research. The first contained bolts and pins as connecting means and the second contained the connecting means of a full threaded screw. Each experiment contained a total of two tests. For a detailed study of the problem, we used a 2D or 3D computational model that models individual components, including fasteners.

Load-Carrying Capacity of Double-Shear Bolted Connections with Slotted-In Steel Plates in Squared and Round Timber Based on the Experimental Testing, European Yield Model, and Linear Elastic Fracture Mechanics

“…The numerical model (see Figure 14) used 3D finite elements, Solid45, with the support of material and geometric nonlinearity. The finite element mesh was divided into several subregions with different finite element sizes with respect to the estimated areas of higher local stress concentrations [53]. A finer mesh was chosen around the contact of the fastener with the timber element.…”

Numerical and Experimental Analysis of the Load-Carrying Capacity of a Timber Semi-Rigid Dowel-Type Connection

“…On the other hand, the fasteners in Experiment B are not commonly used in practice. The presented paper is a follow-up research of Johanides 2020 [ 41 ] and Johanides 2021 [ 42 ]. These papers dealt with determining the rotational stiffness and load-carrying capacity of a timber frame corner, which was made of larger cross-sections with a greater number of fasteners.…”

Structural Timber Connections with Dowel-Type Fasteners and Nut-Washer Fixings: Mechanical Characterization and Contribution to the Rope Effect

“…On the other hand, the connections with nut-washers are less common in construc-tion and their investigations are based on the combination of the geometric distribution of the nuts-washers where the aim is also to shorten and simplify the assembly time. In order to improve the load-bearing capacity and rigidity of this type of frame connection [ 11 , 12 ] and even with investigations based on numerical models using FEM simulations [ 13 , 14 ], although they do not deem the contribution that this type of fixings makes to the rope effect. However, the studies with nut-washer fixings to investigate their contribution to the rope effect are more limited and are based on scale joint models, determining the contribution that this effect has in the different failure modes [ 15 ].…”