Influence of test specimen on experimental characterization of timber–concrete composite joints

Carvalho, Eliene Pires; Carrasco, Edgar Vladimiro Mantilla

doi:10.1016/j.conbuildmat.2009.12.036

Cited by 27 publications

(2 citation statements)

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“…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%

“…Each of the key structural properties of TCC connections has come under scrutiny in targeted studies. For example, longitudinal shear strength was found [14] to be palpably higher for the concrete-timber-concrete double shear test configuration than for the timber-concrete-timber alternative. Moreover, high ductility of the connections was shown [32,33] to lead to user-friendly analysis approaches for TCC members at ultimate, and also in one case [34] to enable up to 87% and 144% increases in ultimate load and midspan deflection, respectively.…”

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confidence: 94%

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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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