Prestressed CLT-concrete composite panels with adhesive shear connection

Bajzecerová, Viktória; Kanócz, Ján; Rovňák, Marián; Kováč, Maroš

doi:10.1016/j.jobe.2022.104785

Cited by 9 publications

(10 citation statements)

References 29 publications

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“…, was determined at a particular angle of rotation, α, in [°] defined in EN 409 as, (5) where α1 is the rotation angle in [°] dependent on the diameter of the dowel-type fastener, ρ is the density of the timber where the fastener is applied in [kg m -3 ], ft, is the tensile strength of the fastener in [MPa] and α1 is 0° for dowels and bolts. In the standards, Equations ( 4) and ( 5) are based on characteristic values in a semi-probabilistic design concept.…”

Section: Evaluation Of Connection Behaviourmentioning

confidence: 99%

“…CLT-concrete hybrid floor systems improve the bending capacity of the pure CLT floor elements by 3-5 times [3]. The suitability of common types of connectors such as, dowel-type fasteners [4], adhesive connections [5] and even novel types of connections [6] for CLT-toconcrete connections have been investigated by various researchers. Though adhesive connections provide an effective way to ensure a rigid shear connection between the concrete and CLT, shrinkage induced deflections of the composite connection render dowel-type connectors more suitable [1].…”

Section: Introduction 567mentioning

confidence: 99%

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Numerical Modelling of a Cross-Laminated Timber-to-Conrete Dowel-Type Connection Using the Beam-on-Foundation Model

Gikonyo

Binder

Schweigler

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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The aim of the research presented herein is to investigate the mechanical behaviour of cross-laminated timber (CLT)-to-concrete dowel-type connections. For reliable timber-concrete-composite structures, mechanical connections between the two construction materials are of great importance. This paper investigates the nonlinear loaddisplacement behaviour, giving access to the stiffness and strength, as well as ductile connection failure modes, of a CLTto-concrete composite connection using a Beam-on-Foundation (BoF) model. The latter is a numerical model that utilizes non-linear springs for the interaction between the fastener and the surrounding CLT and concrete materials. The influence of: (i) fastener diameter, (ii) initial slip, (iii) concrete embedment properties, and (iv) axial fastener resistance due to friction, on the connection shear capacity and slip modulus, was investigated in a parameter study. The nonlinear loaddisplacement response, connection stiffness and strength predicted by the BoF model were moreover compared to laboratory tests and the European Yield Model (EYM), which supported the validity of the BoF model. In addition, it was shown that the BoF model could enhance the prediction of the slip modulus compared to the current design regulations in Eurocode 5.

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Section: Evaluation Of Connection Behaviourmentioning

confidence: 99%

Section: Introduction 567mentioning

confidence: 99%

Numerical Modelling of a Cross-Laminated Timber-to-Conrete Dowel-Type Connection Using the Beam-on-Foundation Model

Gikonyo

Binder

Schweigler

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

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show abstract

“…Nowadays, timber-concrete composites (TCC) emerge as an efficient alternative to traditional steel-RC structures. The application of adhesives in connections in TCC structures is extensively investigated in [25][26][27][28]. The first attempts in the bonding of the concrete-to-concrete elements of composite structures can be found in [29,30].…”

Section: Introductionmentioning

confidence: 99%

“…An interface layer of FPU constructs the polyurethane flexible joint, transferring high loads and high deformations simultaneously. Thanks to its flexibility, it can reduce stress concentrations and redistribute them more evenly along the bond length [28]. The problem of the theoretical analysis of highly nonlinear PUFJ is not trivial.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Flexibility of a Polymeric Adhesive Layer on the Mechanical Response of a Composite Reinforced Concrete Slab and a Reinforced Concrete Beam Girder

Szeptyński,

Pochopień,

Jasińska

et al. 2024

Polymers

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This study addresses the challenges of modeling flexible connections in composite structures employing a polymeric adhesive layer. These types of connections provide a more uniform stress distribution compared to conventional rigid connectors. However, they lack standardized design rules and still require much research to sufficiently comprehend their properties. The novelty of this research lies in proposing an analytical solution to address these issues. Its aim is to investigate the influence of the stiffness of the polymer adhesive on the girder’s deflection and on the maximum stresses in both the adhesive and concrete. The analyzed composite structure consists of a reinforced concrete (RC) slab and an RC beam connected with a layer of flexible polyurethane (FPU) adhesive. Analytical and numerical approaches for the description of the mechanical response of a composite bridge girder are presented. Another objective is to validate the analytical design formulas using 3D nonlinear numerical analysis, both in the case of uncracked and cracked concrete. Seven types of FPUs are tested in the uniaxial tension test, each examined at five strain rates. The obtained data is used to predict the mechanical response of the considered girder using finite element analysis (FEA) as well as with a simplified one-dimensional composite beam theory. Fair agreement is found between the FEA results and theoretical predictions. A comparison of the results obtained for these two models is performed, and the similarities and discrepancies are highlighted and discussed.

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“…Another factor which may aid in broadening the use of wood in load-bearing structures in buildings and in the construction of transport infrastructure is that it can be successfully combined with other building materials, such as concrete [21] or steel [22]. Combined timber-steel bridges represent a very effective type of superstructure in contemporary road and footbridges, especially in natural areas, but also in urban environments.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analyses of Timber–Steel Footbridges

Gocál,

Vičan,

Odrobiňák

et al. 2024

Applied Sciences

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In addition to traditional building materials, such as steel and concrete, wood has been gaining increasing prominence in recent years. In the past, the use of wood was limited due to its susceptibility to damage by fungi, insects, and temperature. These shortcomings were gradually eliminated as the quality of wood processing increased and thanks to modern high-quality insulating and protective materials. The return to the utilisation of this natural building material was also supported by the development of new wood-based materials, such as glued laminated wood, and new types of mechanical fasteners, as well as by the introduction of new design methods provided in the Eurocodes. Within this context, this paper focuses on using wood in transport infrastructure, especially as the basic material for footbridges and small road bridges. Combined timber–steel bridges emerge as a very effective type of superstructure in contemporary road bridges and footbridges, especially in areas with natural exposure. Usually, wood is used for the main bridge girders, while steel is preferred for bridge deck elements—stringers and cross-girders. The results of this parametric study offer optimal structural solutions for footbridges with spans of 12.0–24.0 m, reflecting satisfactory static and dynamic footbridge behaviour. Particular attention is paid to a problematic structural detail—the connection between the steel cross-girder and the timber main girder. Firstly, this connection’s characteristics were measured experimentally using nine laboratory samples made of two glued laminated timber blocks, simulating main girders connected with a hot-rolled steel cross-girder. The connection was prepared in three variants, with different heights of the end plates and different numbers of bolts. Subsequently, these characteristics were computed using two numerical FEM models. The first model was created using SCIA Engineer software with a combination of shell and beam finite elements. The second, more sophisticated model was created in the ANSYS software environment using 3D finite elements, allowing us to better take into account the plasticity and orthotropic properties of wood and the points of contact between the individual members. Finally, the experimental results produced by sample testing in the laboratory were compared to the outputs of FEM numerical studies.

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Prestressed CLT-concrete composite panels with adhesive shear connection

Cited by 9 publications

References 29 publications

Numerical Modelling of a Cross-Laminated Timber-to-Conrete Dowel-Type Connection Using the Beam-on-Foundation Model

Numerical Modelling of a Cross-Laminated Timber-to-Conrete Dowel-Type Connection Using the Beam-on-Foundation Model

The Influence of the Flexibility of a Polymeric Adhesive Layer on the Mechanical Response of a Composite Reinforced Concrete Slab and a Reinforced Concrete Beam Girder

Experimental and Numerical Analyses of Timber–Steel Footbridges

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