Finite element modelling of inclined screwed timber to timber connections with a large gap between the elements

Avez, Coralie; Descamps, Thierry; Serrano, Erik; Léoskool, Laurent

doi:10.1007/s00107-015-1002-1

Cited by 26 publications

(38 citation statements)

References 6 publications

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“…Furthermore, a growing trend is represented by the innovative application to timber joints for constructions . [181][182][183] As an example, reference [181] and Figure 14, illustrate how a standard pull-pull test configuration can be used for the mechanical analysis and characterization of the CZM input parameters.…”

Section: Application Of the Czm Methods To Glued-in Rods In Cross Laminated Timbermentioning

confidence: 99%

A review on failure theories and simulation models for adhesive joints

Τσερπές

Barroso-Caro

Carraro

et al. 2021

The Journal of Adhesion

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In the framework of the Cost Action CERTBOND (Reliable roadmap for certification of bonded primary structures), a wide group of researchers from 27 European Countries have had the opportunity to work on the topic of certification of bonded joints for primary structural applications from different engineering sectors such as the aerospace, automotive, civil engineering, wind energy and marine sectors. Since virtual testing and optimization are basic tools in the certification process, one of the key objectives of CERTBOND is to critically review some of the available models and failure theories for adhesive joints. The present paper summarizes the outcome of this task. Nine different models/theories are described in detail. Specifically, reviewed are the Classical Analytical Methods, the Process Zone Methods, Linear Elastic Fracture Mechanics (LEFM), the Virtual Crack Closure Technique (VCCT), the Stress Singularity Approach, Finite Fracture Mechanics (FFM), the Cohesive Zone Method (CZM), the Progressive Damage Modeling method and the Probabilistic methods. Also, at the end of the paper, the modeling of temperature effects on adhesive joints have been addressed. For each model/theory, information on the methodology, the required input, the main results, the advantages and disadvantages and the applications are given.

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Section: Application Of the Czm Methods To Glued-in Rods In Cross Laminated Timbermentioning

confidence: 99%

A review on failure theories and simulation models for adhesive joints

Τσερπές

Barroso-Caro

Carraro

et al. 2021

The Journal of Adhesion

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“…In the specific case, based on past literature contributions (see, e.g., [20]), such a damage model was calibrated to account for the damaged behaviour of timber, when subjected to compression stress peaks in the direction parallel to grain. To this aim, the initial fracture strain was estimated as f c,||,m /E || � 0.005.…”

Section: Methodsmentioning

confidence: 99%

“…To this aim, the initial fracture strain was estimated as f c,||,m /E || � 0.005. A linear evolution of compressive damage, up to 4 mm of deformation (see also [20]), was then considered.…”

Section: Methodsmentioning

confidence: 99%

“…Due to lack of experimental calibrations at the material level, compared to C24 spruce logs, an equivalent elastoplastic law was still considered for hardwood but with nominal input parameters (E 90 � 930 MPa the MOE in the direction perpendicular to the grain of D50-class timber [17] and f c,90,m ≈ f c,90,k /0.7 � 8.85 MPa, being the latter value representative of the mean compressive resistance in the direction perpendicular to grain). Like in the case of timber logs, the ductile damage material option was also implemented, with f c,90,m /E 90 � 0.01 the failure strain initiation and a linear stiffness degradation up to 4 mm of local deformations ( [20]). …”

Section: Methodsmentioning

confidence: 99%

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Numerical Investigation of Timber Log‐Haus Walls with Steel Dovetail Reinforcements under In‐Plane Seismic Loads

Bedon

Fragiacomo

2018

Advances in Civil Engineering

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e paper investigates the structural response and vulnerability of timber log-haus walls under in-plane seismic loads. Careful consideration is given, in particular, to the structural efficiency of additional metal fasteners introduced within the thickness of traditional timber log-walls. Log-haus systems are in fact typically obtained by stacking multiple logs and generally used for residential or commercial buildings up to two levels. eir seismic characterization, however, still requires further investigations and studies, since current standards for timber structures (i.e., Eurocode 5 and Eurocode 8) do not provide specific recommendations for their seismic design. In this regard, the so-called "steel dovetail profiles" investigated in this paper are aimed to improve the in-plane stiffness and ultimate resistance of traditional log-walls. In particular, taking advantage of past experiments carried out on small-scale joint specimens, as well as past 3D numerical efforts for the same structural typology (unreinforced assemblies), full 3D solid models are described in ABAQUS to assess the potential of steel dovetail profiles, as well as to capture possible issues. Numerical simulations are proposed both for small-scale specimens and full log-haus assemblies, being representative of the actual loading and boundary conditions for log-haus walls as part of a real building. As such, the effects of key input parameters and main influencing aspects are emphasized. In conclusion, it is shown that the examined reinforcing technique can offer rather stable initial stiffness and ultimate resistance increase, compared to unreinforced assemblies. At the same time, several aspects should be taken into account to properly optimize their benefits.

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“…A cohesive zone model (CZM) was used to model the quasi-brittle tensile and shear failure modes of the timber material [30,[34][35][36][37] based on eight-node COH3D8 cohesive elements [20] for this purpose. To capture the rupture developing in the compressive zone (Figure 2 (a)), cohesive elements were included through the thickness and along the longitudinal axis of the sectionsee Figure 3.…”

Section: Fracturementioning

confidence: 99%

Veneer-based timber circular hollow section beams: Behaviour, modelling and design

Gilbert

Dias-da-Costa

Lebée

et al. 2020

Construction and Building Materials

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Various forms of timber hollow structural profiles have either been proposed in the literature or are already commercially available. Tests performed on Circular Hollow Section (CHS) beams showed failure modes not usually encountered in timber structures. For relatively thin-walled profiles, a sudden failure in the compression zone, with the opening of the cross-section, was observed. To confidently use and market CHS timber products, design rules considering all possible failure modes must be developed. This paper presents a Finite Element (FE) model of CHS timber beams which captures all experimentally observed failure modes. Cohesive zone elements were used to model the quasi-brittle failure modes of the timber material. The model was validated against ten experimental tests performed on CHS of three different cross-sectional slenderness and manufactured from juvenile hardwood Gympie messmate (Eucalyptus cloeziana) rotary peeled veneers. The model was found to accurately capture the measured structural behaviour and resulted in an average experimental-to-predicted bending capacity ratio of 1.02. The model was also used to explain the mechanisms leading to the sudden compressive failure mode. A parametric study was finally performed on 72 CHS beams of different cross-sectional slenderness. Results showed a strong correlation between the cross-sectional slenderness ratio and section capacity. Design rules are proposed and discussed.

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Finite element modelling of inclined screwed timber to timber connections with a large gap between the elements

Cited by 26 publications

References 6 publications

A review on failure theories and simulation models for adhesive joints

A review on failure theories and simulation models for adhesive joints

Numerical Investigation of Timber Log‐Haus Walls with Steel Dovetail Reinforcements under In‐Plane Seismic Loads

Veneer-based timber circular hollow section beams: Behaviour, modelling and design

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