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

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7429
Author(s):  
Marek Johanides ◽  
David Mikolasek ◽  
Antonin Lokaj ◽  
Petr Mynarcik ◽  
Zuzana Marcalikova ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Experimental Test ◽  
Carrying Capacity ◽  
Rotational Stiffness ◽  
Load Bearing Capacity ◽  
Computational Approaches ◽  
Load Bearing ◽  
Timber Frame ◽  
Numerical Tests ◽  
Wooden Structures

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.

IMPROVING CONSTRUCTIVE SOLUTION OF BEAM WITH CORRUGATED WALL

2016 ◽  
Vol 6 (2) ◽  
pp. 4-9 ◽  
Author(s):  
Aleksey O. LUKIN ◽  
Vadim Yu. ALPATOV ◽  
Dmitriy D. CHERNYSHEV
Keyword(s):  
Bearing Capacity ◽  
Carrying Capacity ◽  
Local Stability ◽  
Local Resistance ◽  
Preliminary Assessment ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
The Stability ◽  
Corrugated Wall ◽  
Corrugated Beam

The analysis of improving ways to test for load-bearing structures - metal beams with corrugated wall was conducted. Weak places, limiting their load-bearing capacity were determined. It was found that the criterion for determining the carrying capacity of thin-walled corrugated beam is its local resistance. The author's solution to increase the local stability of the corrugated wall beams was suggested. Author's solution is to give the corrugated wall of further extruded profile of different geometry. The influence of the shape and size of punching the wall on the carrying capacity of corrugated beams was determined. The studies confirming the effectiveness of the proposed constructive solutions increase the stability of the corrugated wall are conducted. Preliminary assessment of the degree of increase of the bearing capacity of the beam by punching its wall is obtained.

scholarly journals Determination of the load-bearing capacity of «steel-wood» connections of LVL structures under tension

2021 ◽  
Vol 18 (1) ◽  
pp. 60-69
Author(s):  
Quoc Phong Tran ◽  
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Steel Plate ◽  
Experimental Studies ◽  
Steel Plates ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Dowel Connections ◽  
Wooden Structures

The article presents the results of calculation of the load-bearing capacity of connections of LVL structures under tension using cylindrical dowels in trusses and frames. The description of calculation schemes for determining the load-bearing capacity of connections with different location and sizes of steel plates in the connection is given. The influence of steel plate placement on the distribution of forces in the cross-section of samples is investigated. Based on the results of analytical and experimental studies, the load-bearing capacity of dowels during bending is considered, as well as the mechanism of wooden structures` fracture during chipping. A comparative analysis of the effectiveness of different schemes of dowel connections with three steel plates under tension is carried out.

scholarly journals Analysis of various failure models of steel-wood connections with self-drilling dowels

2020 ◽  
Vol 17 (5) ◽  
pp. 72-81
Author(s):  
Quoc Phong Tran ◽  
Keyword(s):  
Bearing Capacity ◽  
Brittle Failure ◽  
Large Diameter ◽  
Small Diameter ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Failure Propagation ◽  
Failure Models ◽  
Dowel Connections ◽  
Wooden Structures

The load-bearing capacity of the dowel connections of wooden structures is determined by two limiting states, namely, by the failure of wood (crumpling) or deformation of steel dowel (bending). Both failure models are plastic. In some cases, brittle failure is possible, which will determine the load-bearing capacity of the connection. However, the regulations in the Russian Federation do not consider the brittle failure of dowel connections because this type of failure is excluded by the rules for placing dowels. Appendix A of Eurocode 5 includes types of brittle failure caused by chipping of a block or slipping of wood in connection. In [10, 11], the authors consider various fracture models for connections with large-diameter dowels (over 12 mm). In the present study, the author evaluates and classifies calculation models for brittle failure in connections of wooden structures using self-drilling dowels of small diameter (less than 12 mm), which are not presented in the Eurocode 5 and SP 64.13330.2017 standards. Solutions are proposed for reducing the probability of brittle failure propagation in such connections.

scholarly journals Analysis of the load bearing capacity of the connection with the use of self-drilling dowels in various models of elastic failure

2020 ◽  
Vol 17 (4) ◽  
pp. 89-99
Author(s):  
A. G. Chernykh ◽  
◽  
Quoc Phong Tran ◽  
Keyword(s):  
Bearing Capacity ◽  
High Strength ◽  
Steel Plates ◽  
Use Of Self ◽  
Calculation Methods ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Factors Affecting ◽  
Wooden Structures ◽  
The Relationship

Currently, wooden structures characterized with high strength, low deformability and good aesthetics are being increasingly used in some areas of construction. Connections with multiple steel plates are very effective for wooden frames and trusses. In order to provide optimal connections, it is necessary to establish the relationship between the connection parameters and the load-bearing capacity of the structure. However, the technical regulations do not provide calculation methods specifically for this type of connection. There have been carried out a research and development of methods for calculating connections, an analysis of the self-drilling dowels` performance, and the factors affecting the load bearing capacity according to Eurocode 5 have been specified. The results obtained have been compared with other various research methods` results, there are offered authors` recommendations on the application of the standard in Russia.

scholarly journals Strengthening of the wooden structures

2020 ◽  
Vol 18 (3) ◽  
pp. 017-028
Author(s):  
Szymon Ślósarz
Keyword(s):  
Composite Materials ◽  
Bearing Capacity ◽  
Operating Conditions ◽  
Review Of The Literature ◽  
Wood Degradation ◽  
Load Bearing Capacity ◽  
Traditional Methods ◽  
Load Bearing ◽  
Modern Methods ◽  
Wooden Structures

The paper is a review of the literature on the strengthening of wooden structures. The strengthening methods are classified according to their purpose and specifics. The article deals with both traditional methods commonly used and modern methods involving the use of composite materials. The paper also includes description of studies on various strengthening methods as well as the presentation of their results. The author also refers to the causes of the loss of load bearing capacity, causes of wood degradation and wooden structures durability in relation to operating conditions.

scholarly journals The Problem of Compressive Strength in Direction Perpendicular to the Grains on Example of Tests of the Load-Bearing Capacity of the Continuously Supported Timber-Frame Sill Plates

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1160
Author(s):  
Janusz Brol ◽  
Jan Kubica ◽  
Marek Węglorz
Keyword(s):  
Compressive Strength ◽  
Bearing Capacity ◽  
Current Approach ◽  
Full Scale ◽  
Test Results ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Timber Frame ◽  
Test Elements ◽  
Sill Plate

This paper presents a discussion of the problem of compressive strength in a direction perpendicular to the grains based on test results of the joints made by timber posts and sill plate. These tests accompanied a larger series of full-scale tests of timber frame walls. The test elements were made of solid softwood (spruce). The wood moisture was low, which corresponds to the real working conditions of these elements in the walls of a building (low humidity is typical for dry wood in the built-in wall of a real building). In the tests, the compression strength of timber perpendicular to the grain was exceeded in the sill plate in the area in contact with the posts. Shortly before reaching the state of failure, large displacements in the sill plate were measured on the contact surface with the post, and the grains in the sill plates were cut off at the edge of the post. The full-scale test results showed an overestimation of the load-bearing capacity in compression perpendicular to the grain when calculated on the basis of EN 1995-1-1+A1:2008 (Eurocode 5), and, therefore, the need to modify the current approach for determining it.

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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