Experimental study on the influence of concrete cracking on timber concrete composite beams

Schanack, Frank; Ramos, Óscar Ramón; Reyes, Juan Patricio; Low, Andrés Alvarado

doi:10.1016/j.engstruct.2014.11.041

Cited by 16 publications

(6 citation statements)

References 7 publications

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“…The resulting composite structure exhibited excellent performance. Schanack et al (2015) used small gaps to simulate the concrete cracking. Then, the authors further studied the mechanical properties of wood-concrete composite beams, which were affected by concrete cracking.…”

Section: Introductionmentioning

confidence: 99%

Shear behavior of I-shaped wood-steel composite beam

Shan

Zhang

et al. 2020

BioRes

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To expand the application of wood as a building material, a new type of I-shaped wood-steel beam that consisted of laminated veneer lumber and cold-formed thin-walled steel was considered in this paper. The shear performance of nine wood-steel composite beams was tested to evaluate the effects of shear span ratio, web thickness, and flange thickness. Then, the failure pattern and failure mechanism of the composite beams were analyzed. The main affecting factors of shear capacities were also discussed. Furthermore, the calculation formula for bearing capacities of composite beams was established and the calculation results were compared with the experimental results. The experimental results showed that the combined effect of composite beams was excellent. The shear capacity was mainly affected by shear span ratio and web thickness. The calculation formula of the shear capacity was established based on the shear flow theory and the specification for structural steel buildings. The formula was derived from the micro-segment balance method and the reciprocal theorem of shear stress. The calculation results according to the formula were in good agreement with the experimental values.

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Section: Introductionmentioning

confidence: 99%

Shear behavior of I-shaped wood-steel composite beam

Shan

Zhang

et al. 2020

BioRes

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“…Research to date, e.g. [2][3][4][5][6][7][8], has focused predominantly on single-joist, single span, simply supported TCCs, which are internally indeterminate due to slab-joist slip. Another study [9] experimentally investigated the non-linear load responses up to failure of multi-span continuous, single T-section TCCs which, in the longitudinal direction, were both internally and externally indeterminate.…”

Section: Introductionmentioning

confidence: 99%

“…The average joist depth was 270mm, with slab thicknesses in the 30mm -150mm range and an average of 65 mm. Joist spacing (or concrete slab width in single-joist specimens) ranged from 300mm to 2000mm with an average of 740mm [3][4][5][6][7][8]9,[12][13][14][15][16][17]25].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of moment sharing in multi-joist timber-concrete composite floors from zero load up to failure

Mudie

Sebastian

Norman

et al. 2019

Construction and Building Materials

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The critical T-sections of multi-joist timber concrete composite (TCC) floors must be designed at ultimate for support shear force and midspan moment, both of which are influenced by transverse sharing, but to different extents. Prior experimental work has investigated only support reaction sharing and only up to serviceability loads. The present experimental study builds on that status quo by quantifying also moment sharing, via strain gauge layouts at quarter-span and mid-span, along with reaction sharing via load cells at the supports of a multi-joist TCC specimen, over the entire load range up to failure. Use of steel mesh connectors bonded into hardwood laminated veneer lumber joists, and near geometric resemblance to a real building TCC floor recently built in London, were novel features of the specimen. The results show that midspan moment and reaction sharing both vary nonlinearly with load, but in distinctly different ways from each other (with up to almost 20% difference observed between them), in the progression between the uncracked, cracked and connection ductility regimes. In this approach reliable assessment of moment sharing depends on the quality of the recorded strains. Accordingly, the strain data were shown to be of high quality by converting these data to internal stress resultants that were then found to satisfy longitudinal equilibrium. It is concluded that this strain gauge layout is useful for future work aimed at building a database of transverse sharing of moments in TCCs.

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“…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. Finally, the slip modulus deduced from testing of TCC connections was found [35] to need a 60% reduction in cracked concrete zones of a FE model, to enable reliable prediction of deflection for the associated TCC member.…”

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confidence: 99%

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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Experimental study on the influence of concrete cracking on timber concrete composite beams

Cited by 16 publications

References 7 publications

Shear behavior of I-shaped wood-steel composite beam

Shear behavior of I-shaped wood-steel composite beam

Experimental study of moment sharing in multi-joist timber-concrete composite floors from zero load up to failure

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

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