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Article Dans Une Revue Engineering Structures Année : 2024

Behaviour of a novel timber-concrete floor with a three-dimensional (3D) ductile notched connection

Résumé

As the sustainability is becoming a new trend in construction, there is a growing inclination towards utilizing timber-concrete composite structures. This paper introduces a system of timber-concrete composite (TCC) floor with three-dimensional (3D) ductile notched connectors. In this system, the web of the timber beam is embedded into the concrete drops so that the notched timber-concrete interface is made of three shear planes instead of one as typically observed in conventional notched connections. This aims to enhance the concrete shear resistance and to prioritize the timber compressive failure, thus achieving a ductile behaviour of the notched connectors. The trapezoidal shape of the connection creates a geometrical interlocking between the timber and the concrete layers for uplift resistance, so that supplementary mechanical steel elements are not necessary. Three symmetrical push-out tests of the proposed notched connectors have been conducted. The results show that the connectors have a remarkable stiffness, strength, and ductility with the failure mode primarily governed by local timber crushing. In addition, three inversed six-point bending tests are performed on TCC floor specimens with a span of 6.55 m. As the self-weight of the specimen and the loading device is non-negligible, this novel test setup is particularly designed to be able to measure deformations and deflections, as well as initial stiffness at a lower load level. The failure mode for all specimens is governed by tensile rupture of the timber beam. The results also show that the proposed connection is effective in limiting slips and uplifts along the beam span. At last, the Gamma-method is adopted in order to estimate the bending stiffness of the TCC floor with an adaptation to take into account the concrete cracking phenomenon. The comparison with experimental results shows that the adapted Gamma-method provides a conservative estimation of the bending stiffness with reasonable margin of error at both serviceability and ultimate limit states.
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Dates et versions

hal-04568331 , version 1 (17-05-2024)

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Adham Al Rahim, Piseth Heng, Pisey Keo, Clemence Lepourry-Nicollet, Franck Palas, et al.. Behaviour of a novel timber-concrete floor with a three-dimensional (3D) ductile notched connection. Engineering Structures, 2024, 309, pp.117963. ⟨10.1016/j.engstruct.2024.117963⟩. ⟨hal-04568331⟩
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