Effect of Interlayer and Inclined Screw Arrangements on the Load-Bearing Capacity of Timber-Concrete Composite Connections

Santis, Yuri De; Sciomenta, Martina; Spera, Luca; Rinaldi, Vincenzo; Fragiacomo, Massimo; Bedon, Chiara

doi:10.3390/buildings12122076

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…It is thus clear that this practice has relevant negative consequences in terms of (i) increased seismic forces, given their inertial characteristics, (ii) low deformations and, consequently, low energy dissipation of RC member compared to timber elements [13], and (iii) additional weight on the existing wall/foundation system, which could not be able to provide sufficient low-bearing capacities [17]. The most widespread solutions adopted to realize TTT sections involve the use of different types of connectors [3,[18][19][20] to join new timber planks or CLT panels to the existing floors. Both the TTC and TTT strengthening techniques are realized by minimizing the thickness of the reinforced floors, in order to preserve the existing floor level and internal room height.…”

Section: Introductionmentioning

confidence: 99%

Out-of-Plane Strengthening of Existing Timber Floors with Cross Laminated Timber Panels Made of Short Supply Chain Beech

Spera,

Sciomenta,

Bedon

et al. 2024

Buildings

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Establishing short supply chains for timber has become important especially in Italy, which is an historically wood-importer country. Timber is an environmentally friendly construction material and a potential mean to reduce carbon footprint produced every year by the building sector. In addition to its sustainability benefits, reversible strengthening interventions can be attained for existing structures. As such, timber can be efficiently used to preserve and protect historical buildings which are, due to architectural and aesthetic values, fundamental components of the Italian cultural heritage. In this study, the use and potential of novel cross-laminated (X-Lam or CLT) timber panels made of Italian hardwood (i.e., beech) for strengthening of existing timber floors is investigated. A quantitative comparison between the mechanical performances of the proposed wood-based product and common retrofitting techniques, such as double-crossed timber planks and reinforced concrete slabs, is carried out in terms of bending stiffness (which is evaluated according to Eurocode 5), influence of weight and reversibility of intervention. It is shown that CLT panels represent a good compromise/alternative for the realisation of reversible and sustainable reinforcing interventions, with rather well promising performances.

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Section: Introductionmentioning

confidence: 99%

Out-of-Plane Strengthening of Existing Timber Floors with Cross Laminated Timber Panels Made of Short Supply Chain Beech

Spera,

Sciomenta,

Bedon

et al. 2024

Buildings

Self Cite

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“…This problem is precisely the weakness of numerical models for non-linear analysis. It is essential to use more sophisticated models that could describe the non-linear behavior of the timber-concrete connection and define the whole load-slip curve (e.g., finite element (FE) models [20][21][22][23]).…”

Section: Introductionmentioning

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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“…In addition, a proper shear connector system is used to effectively transfer the shear between the timber and the concrete components. The shear connection between the two materials is a critical component in the performance of TCC slabs [9]. It directly impacts the composite behavior, stress distribution, deformations, and the design of the slab.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of a Novel Demountable Timber–Concrete Composite Floor

2023

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In recent years, there has been an increasing interest in timber–concrete composite (TCC) floors as a sustainable structural solution. Until now, only a few studies have investigated the demounting of TCC floors, which is essential to increase sustainability and improve the end-of-life environmental benefits of a floor system. This study investigates an innovative and straightforward demountable TCC slab that has notched and bolted connections. Six downscaled slabs are tested under four-point bending. The results show that the slab system has high composite action with an efficiency of 0.73. A three-dimensional finite element model is developed and calibrated with the experimental result. The model is used to study the influence of several parameters, such as the shape and dimensions of the notch as well as the bolt location on the load-bearing capacity and the load-deflection behavior of the slab. The results show that the failure tends to be more ductile when a birdsmouth-shaped notch is used, and the bolt is placed within the notch. Moreover, the load-bearing capacity of the shear connection increases by increasing the distance of the notch to the end of the slab and using a triangular notch.

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Effect of Interlayer and Inclined Screw Arrangements on the Load-Bearing Capacity of Timber-Concrete Composite Connections

Cited by 11 publications

References 22 publications

Out-of-Plane Strengthening of Existing Timber Floors with Cross Laminated Timber Panels Made of Short Supply Chain Beech

Out-of-Plane Strengthening of Existing Timber Floors with Cross Laminated Timber Panels Made of Short Supply Chain Beech

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

Experimental and Numerical Investigation of a Novel Demountable Timber–Concrete Composite Floor

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