Experimental and theoretical evaluation of TCC connections with inclined self-tapping screws

Marchi, Luca De; Scotta, Roberto; Pozza, Luca

doi:10.1617/s11527-017-1047-1

Cited by 52 publications

(17 citation statements)

References 16 publications

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“…They usually do not need pre-drilling and provide fast installation with a high withdrawal resistance in wood materials. Recent research on self-tapping screws has been focused on the CLT panel shear connection [2], timber-to-timber joints [3][4][5], timber-to-steel joints [6][7][8], and timber-toconcrete joints [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

et al. 2020

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The aim of this study was to predict the withdrawal resistance of a screw in hybrid cross-laminated timber (CLT) composed of two types of lamina layers. A theoretical model to predict the withdrawal resistance was developed from the shear mechanism between a screw and the layers in hybrid CLT. The parameters for the developed model were the withdrawal stiffness and strength that occurs when a screw is withdrawn, and the penetration depth of a screw in layers of a wood material. The prediction model was validated with an experimental test. Screws with two different diameters and lengths (Ø6.5 × 65 mm and Ø8.0 × 100 mm) were inserted in a panel composed of solid wood and plywood layers, and the withdrawal resistances of the screws were evaluated. At least 30 specimens for each group were tested to derive the lower 5th percentile values. As a result, the developed model predictions were 86–88% of the lower 5th percentile values of hybrid CLT from the properties of the lamina layer. This shows that the withdrawal resistance of hybrid CLT can be designed from the properties of its layer.

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Section: Introductionmentioning

confidence: 99%

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

et al. 2020

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“…1 were employed in the simulation analysis. And only a quarter of the model was adopted because of the symmetry of the test specimen [11,12].…”

Section: Simulation Of the Shear Behavior Of Inclined Stss At Ambient Temperaturementioning

confidence: 99%

“…The failure mechanism and mode of inclined cross lag screws for TCC beams has been demonstrated and critically discussed [10]. With varying screw diameters, embedded depth, inclination angle and arrangement, push-out tests of TCC beams were conducted to assess the shear behavior of STSs in term of both the strength and stiffness [11,12]. In the theoretical analysis, various calculation models of screw shear behavior under ambient temperature have been proposed [11,13] and good agreement was found between calculation and experimental results.…”

Section: Introductionmentioning

confidence: 99%

“…With varying screw diameters, embedded depth, inclination angle and arrangement, push-out tests of TCC beams were conducted to assess the shear behavior of STSs in term of both the strength and stiffness [11,12]. In the theoretical analysis, various calculation models of screw shear behavior under ambient temperature have been proposed [11,13] and good agreement was found between calculation and experimental results. As for finite element analysis, many researchers have developed various reliable FE models of push-out test [14][15][16][17], which could accurately predict the connection behavior of screw between wood and wood at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Connection Performance of Timber-Concrete Composite Slabs with Inclined Self-Tapping Screws under High Temperature

Zhen-tao¹,

Lu²,

Bao³

et al. 2022

Journal of Renewable Materials

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The timber-concrete composite (TCC) slabs have become a preferred choice of floor systems in modern multi story timber buildings. This TCC slab consisted of timber and a concrete slab which were commonly connected together with inclined self-tapping screws (STSs). To more accurately predict the fire performance of TCC slabs, the mechanical behavior of TCC connections under high temperature was investigated by numerical simulation in this study. The interface slip of TCC connections was simulated by a proposed Finite Element (FE) model at room temperature, and different diameter and penetration length screws were considered. The effectiveness of this FE model was validated by comparing with the existing experimental results. Furthermore, the sequentially coupling thermal stress analyses of this model were conducted, and the relationship between the reduction coefficient of connection performance and the effective penetration length of screws was summarized. This study gave the fitting expressions for the reduction coefficient of slip modulus and joint strength. Finally, the numerical investigations of the fire performance of TCC slabs considering the char fall-off of Cross Laminated Timber (CLT) were performed to verify the effectiveness of the proposed reduction law. Comparing the fire-resistance time with experimental results showed deviation of the proposed model was −14.02%.

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“…In this model, the timber was considered as the elastic foundation which consisted of orthogonal springs with different foundation stiffnesses in the parallel and transverse to the timber grain, but the friction between the timber beam and the concrete slab was neglected. Furthermore, Marchi et al (2017) developed the simplified calculation method for predicting the shear stiffness of inclined screws. As shown by the theoretical results, the shear stiffness of the inclined screw was mainly contributed by the lateral stiffness and the axial stiffness of the screw connector.…”

Section: Introductionmentioning

confidence: 99%

Shear stiffness of inclined screws in timber–concrete composite beam with timber board interlayer

Sun

et al. 2020

Advances in Structural Engineering

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The timber board interlayer is applied as the formwork for the pouring of concrete slab in various practical applications of timber–concrete composite structures, with the rehabilitation of timber buildings, in particular. At present, there are few studies performed to study the shear stiffness of inclined screws in timber–concrete composite beams with timber board interlayer. In this article, eight groups of shear tests were carried out to study the shear stiffness of inclined screws in timber–concrete composite beams with timber board interlayer. The key parameters included the embedment depth of the screw connector into timber, screw diameter, the thickness of concrete slab, and concrete strength. As indicated by the test results, the shear stiffness of the inclined screws was improved as the embedment depth of screw into timber and screw diameter increased. When the embedded depth of screw into concrete remained unchanged, the thickness of concrete slab and concrete strength exhibited no significant impact on the shear stiffness of inclined crossing screws. On the basis of the theory of a beam on a two-dimensional elastic foundation, the calculation method for predicting the shear stiffness of inclined screw in timber–concrete composite beams with interlayer was proposed. The comparisons demonstrated that the shear stiffness of inclined screw can be well predicted using the calculation method.

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Experimental and theoretical evaluation of TCC connections with inclined self-tapping screws

Cited by 52 publications

References 16 publications

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

Prediction of withdrawal resistance for a screw in hybrid cross-laminated timber

Numerical Investigation of Connection Performance of Timber-Concrete Composite Slabs with Inclined Self-Tapping Screws under High Temperature

Shear stiffness of inclined screws in timber–concrete composite beam with timber board interlayer

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