Influence of the rope effect on the slip curve of laterally loaded, nailed and screwed timber-to-timber connections

Gečys, Tomas; Bader, Thomas K.; Olsson, Anders; Kajėnas, Simonas

doi:10.1016/j.conbuildmat.2019.116702

Cited by 17 publications

(5 citation statements)

References 7 publications

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“…The theoretical formula proposed by Eurocode 5 for predicting the yield moment of fasteners was based on regression analysis using empirical data (EN 1995(EN -1-1 2010. Gečys et al (2019) reported that Eq. 1 based on dynamics is close to the experimentally determined yield moment.…”

Section: Theoretical Model European Yield Model (Eym)mentioning

confidence: 99%

Evaluation of shear performance of timber-timber composite joints

Song,

Baek,

Hong

2024

BioRes

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The mechanical performance of timber composite floors is influenced by the degree of composite action between the components. In this study, the shear strength performance of cross-laminated timber and glued laminated timber composite floors based on the joining method was evaluated by push-out test. Eight types of timber-timber composite joints were evaluated using three different methods: lag screw joints, glued-in rod joints using fully threaded bolts and glass fiber reinforced plastic, and hybrid joints. Strength characteristics were derived to make theoretical predictions on the load-carrying capacity of the joints. The results showed that the glued-in rod joints were superior to the lag screw joints, with slip coefficients and ductility measured as 10 times and 2.5 times higher, respectively. The reliability of the strength characteristics of the glued-in rod joints was remarkably different depending on the presence or absence of anti-adhesive tape applied to the timber-to-timber joint surface. The load capacity of the hybrid joint, which combines mechanical and glued-in rod joining methods, was 47% higher than that of the lag screw joint and 38% higher than that of the glued-in bolt joint. In the European Yield Model modified to estimate the load capacity of joints, the rope effect and the yield moment of the fasteners had a remarkable impact on the predicted load capacity.

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Section: Theoretical Model European Yield Model (Eym)mentioning

confidence: 99%

Evaluation of shear performance of timber-timber composite joints

Song,

Baek,

Hong

2024

BioRes

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“…Based on the yield moment M y,max , the ultimate strength of the screw from the bending test can be estimated with Equation ( 9), based on the plastic moment according to the mechanical relationship via assuming full plastification of the screw cross-sections. In Equation ( 9), the effective screw diameter d eff is applied [53]. The ultimate strength of the screw in bending was f ub,max = 612 MPa (~0.9•f u ).…”

Section: Description Of Shear Test Specimensmentioning

confidence: 99%

“…It should be noted that in Figure 14c, the red line (Fv,R) represents the Fv,R − δ curve of the connection without the influence of the group effects (effective number of fasteners in a line parallel to the grain on the load-carrying capacity of the connection), while the dashed line (Fv,eff,R(neff)) takes into account the spacing between the screws through the effective number of screws, neff = 0.93, reducing the load-carrying capacity of the connection. With this simple suggestion from Eurocode 5, as well as observations and conclusions reported in [53], in the proposed numerical model, an attempt was made to consider the reduction in the load-carrying capacity of the connection through the effective number of screws. This recommendation refers to the final value of the load-carrying capacity and that further investigation of this influence on the complete Fv,R -δ curve is necessary to improve the prediction by the proposed numerical model.…”

Section: Validation Of the Proposed Model Via An Example From The Lit...mentioning

confidence: 99%

Simulation of Load–Slip Capacity of Timber–Concrete Connections with Dowel-Type Fasteners

et al. 2023

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Quality assessment of stiffness and load-carrying capacity of composite connections is of great importance when it comes to designing timber–concrete composite structures. The new European regulation intended explicitly for timber–concrete structures has made a significant contribution to this field, considering that until today there was no adequate design standard. Due to the proposed general expressions for determining the stiffness and load-carrying capacity of composite connections made with dowel-type fasteners, which are incapable of describing most of the commonly applied fasteners, engineering, and scientific practice remained deprived of a quality assessment of the essential mechanical properties of the connection. In order to overcome this problem, this paper proposes a numerical model of the connection suitable for determining the whole load–slip curve, allowing it to estimate the stiffness and load-carrying capacity of the connection. The model was developed by considering the non-linear behavior of timber and fasteners, which is determined through simple experimental tests. For the numerical model validation, experimental tests were carried out at the level of the applied materials and on the models of the composite connection. Through numerical simulations, analysis of obtained results, and comparison with experimental values, it can be confirmed that it is possible to simulate the pronounced non-linear behavior of the timber–concrete connection using the proposed model. The estimated values of stiffness and load-carrying capacity are in agreement with the conducted experimental testing. At the same time, the deviations are much less than the ones obtained from recommendations given by the new regulation. Additionally, apart from evaluating the value and the simulation of the complete curve, it is possible to determine local effects, such as the crushing depth in timber and concrete, the fastener’s rotation, and the participation of forces in the final capacity of the connection.

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“…It has been expected that higher thickness of the steel profile web would give higher connection strength, but that was not the case in this research. The explanation lies in the phenomenon known as rope effect [39]. Namely, if the connection of the bolt and the steel profile is pinned, rotation of the bolt head generates higher axial force in the bolt than in case of thicker steel profile (Fig.…”

Section: Influence Of the Steel Profile Web Thicknessmentioning

confidence: 99%

Experimental Research and FE Model of a Bolted Steel-CLT Composite Connection

Milić

Vacev

Petronijević

et al. 2023

Period. Polytech. Civil Eng.

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Steel-timber composite structures have numerous advantages compared to steel only and timber only structures. One of the most important parts of a composite structure is the composite connection. Object of this research was a steel-CLT composite connection consisting of a steel profile, a cross-laminated timber (CLT) panel and a bolt with nut and washer. Aim of the research was to develop an efficient finite element (FE) model of a bolted steel-CLT composite connection and to validate it experimentally. The research process consisted of several steps: experimental testing of the considered connection using asymmetrical push-out test, numerical modelling and analysis of the connection using Finite Element Method (FEM), validation of the numerical model using experimental results, and parametric study of the proposed numerical model. For numerical analysis, an innovative method for timber modelling has been proposed. The comparison between the experimental and numerical research results demonstrated that the proposed numerical model was convenient for practical application in structure analyses. The parametric study showed that, in some cases, atypical failure modes of the connection occurred. Based on registered behavior, a recommendation is given to calculate the load capacity of the connection integrally, taking into account both the primary (Johansen’s) and the secondary (rope effect) part of the connection strength, instead partially, as proposed by EN standards.

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Influence of the rope effect on the slip curve of laterally loaded, nailed and screwed timber-to-timber connections

Cited by 17 publications

References 7 publications

Evaluation of shear performance of timber-timber composite joints

Evaluation of shear performance of timber-timber composite joints

Simulation of Load–Slip Capacity of Timber–Concrete Connections with Dowel-Type Fasteners

Experimental Research and FE Model of a Bolted Steel-CLT Composite Connection

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