Tangential behavior of nailed composite timber–concrete floor structures

Taazount, M.; Amziane, Sofiane; Molard, Dominique

doi:10.1016/j.conbuildmat.2012.09.092

Cited by 20 publications

(7 citation statements)

References 12 publications

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“…Now at the start of the calculations the depth of cracked concrete (if it exists) is not known, so an iterative method is needed to determine this depth. Essentially, when the iterations converge, the value of ac calculated via Equations (5) and (6) leads to an effective section stiffness (EI)eff which, via Equation 8, enables a calculation of zero stress at the base of the active (uncracked) concrete. This iterative loop was performed in Excel using the goal seek function.…”

Section: Application Of Gamma Methods To Tcc Beammentioning

confidence: 99%

“…It is thus important to quantify these connection properties. To that end multiple studies [1][2][3][4][5] show that, by comparison with test data, existing standards predict these properties to quite variable degrees of accuracy. Thus, into the foreseeable future, testing will be the primary means of characterising connection behaviour.…”

Section: Literature Reviewmentioning

confidence: 99%

“…TCC connections based on mechanical connectors have been extensively characterised in experimental studies to date. These include nails or nail-plates [1,[5][6][7], vertical or inclined screws [6,[8][9][10][11][12], dowels [4,13,14], perforated steel plates or steel meshes bonded into the timber [3,[15][16][17], and notches [3,6,[18][19][20][21][22]. The tests have considered both normal and lightweight concretes, short-term and long-term behaviours, and the presence or absence of a formwork interlayer.…”

Section: Literature Reviewmentioning

confidence: 99%

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Forward and Reverse shear transfer in beech LVL-concrete composites with singly inclined coach screw connectors

Sebastian

Piazza

Harvey³

et al. 2018

Engineering Structures

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Double-shear tests are reported on beech LVL-concrete composite connections based on coach screw connectors singly inclined at either 45 o or 90 o. On different specimens with the same screw orientation the longitudinal shear force was applied either in forward or reverse, because in practice concrete shrinkage, moisture-induced timber expansion and oscillatory (e.g. seismic) or moving loads can induce reversal of the force on the connection. The test data show that relative to the 90 o screw connections, sloping the screws to 45 o in tension only marginally affected longitudinal shear strength but led to a five-fold increase of slip modulus and to a significant drop in ductility, while sloping the screws the other way to 45 o in compression only marginally affected slip modulus but led to an almost four-fold drop in longitudinal shear strength and to a substantial increase in ductility. The specimens tested within each group showed good consistency of shear strength and (except the 45 o tension screw specimens, despite their consistent strengths) of failure mode, but high variability of slip modulus. Comparisons with previously tested timber-concrete composite (TCC) connections based on other screw types and layouts suggest good performance of the present connections. The gamma method applied to a given TCC T-section under load shows that the present alternate connections lead to quite different depths of uncracked concrete and so to significant variation of midspan deflection. In closing, it is recommended that both forward and reverse shear testing becomes a protocol for singly inclined coach screw-based TCC connections.

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Section: Application Of Gamma Methods To Tcc Beammentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Forward and Reverse shear transfer in beech LVL-concrete composites with singly inclined coach screw connectors

Sebastian

Piazza

Harvey³

et al. 2018

Engineering Structures

View full text Add to dashboard Cite

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“…Besides, some researchers investigated long-term properties of shear connectors, and types of concrete, environment changes, type of timber, and type of shear connectors were main variation parameters (Dias, 2005; Fragiacomo, 2012; Jorge et al, 2010; Lozančić et al, 2010). Other researchers studied the calculation method of stiffness and shear bearing capacity (Branco et al, 2009; Dias, 2005; Taazount et al, 2013). Jiang et al (2017) investigated the early-age performance of timber-lightweight concrete composite beams.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and theoretical analysis of glulam-concrete composite beams connected with ductile shear connectors

Hong

Jiang

Fang

et al. 2019

Advances in Structural Engineering

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Ductile shear connectors are often applied in timber-concrete composite beams. The relative interface slip of such kind of composite beams will affect the mechanical performance of the composite beams and result in structural nonlinearity. Gamma method which adopts effective bending stiffness to reflect semi-rigid connection is recommended in Eurocode 5. The effective bending stiffness is irrelevant to external loads and calculation points of the composite beam. However, actual bending stiffness distribution along the beam is variable due to that shear connectors are subjected to different shear force. In order to verify the accuracy of gamma method, four-point bending tests of a total of three glulam-concrete composite beams with lag screw connectors and one pure glulam beam were conducted in this article. The failure mode, bearing capacity, and load–deflection relationship were investigated in the experiment. Meanwhile, push-out tests of composite beams were also conducted for determination of the force–displacement relationship of ductile shear connectors. Then, numerical simulation using beam-truss model was established for investigation on the mechanism of composite beams. Finally, theoretical analysis of composite beams considering the effect of interface slip was also presented. Comparing results from gamma method with the presented method, it is shown that both methods can calculate deflection at serviceability limit state with high precision. However, non-uniform distribution of actual bending stiffness cannot be reflected by gamma method.

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“…In a set of experiments that examined a large variety of different shear connection designs for a composite timber/concrete flooring system, the highest performing connection utilized a cast-in-place screw [7]. In another experimental study, cast-in-place nailed connections were explored as a means of developing better timber/concrete composite action, resulting in increased efficiency of the composite section [8]. Further, steel fasteners have been used to resist shear in CFS/calcium-silicate framed wall panel systems [9].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Shear Transfer in Composite Deck with Mechanical Fasteners

McComb¹,

Tehrani²

2018

Preprint

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Reinforced concrete construction and steel construction are two of the most common contemporary construction methods. Both methods make use of composite decks as floor systems and diaphragms. During the design of composite decks, the interaction between the steel deck and concrete slab is typically disregarded when calculating the strength of the composite diaphragm due to lack of complete shear transfer, as existing practices such as stamping are not effective to provide substantial composite action. This conservative assumption essentially results in non-efficient use of material. This paper presents a method for ensuring shear transfer through the use of conventional sheet metal screws, driven through the corrugated steel deck and embedded in the fresh concrete. This method is proposed for use in the field between formed steel beams. Both experimental and analytical studies support an increase in strength with the addition of embedded fasteners. Further, experimental results indicate an additional increase in strength with the addition of synthetic reinforcing fibers. The increase in strength with the addition of the fasteners is on the order of 100%. When fasteners are already in use, the addition of synthetic reinforcing fibers can increase strength on Preprint submitted to Engineering Structures January 27, 2015 the order of 10%. The ultimate deflection of enhanced deck is comparable to deck tested without fasteners, but the initial stiffness of enhanced deck is much higher.

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Tangential behavior of nailed composite timber–concrete floor structures

Cited by 20 publications

References 12 publications

Forward and Reverse shear transfer in beech LVL-concrete composites with singly inclined coach screw connectors

Forward and Reverse shear transfer in beech LVL-concrete composites with singly inclined coach screw connectors

Experimental study and theoretical analysis of glulam-concrete composite beams connected with ductile shear connectors

Enhancement of Shear Transfer in Composite Deck with Mechanical Fasteners

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