Abstract
Cross-laminated timber panels offer an effective option for timber structures; they allow biaxial load transfer and have good dimensional stability. However, practical transportation and handling limits size of the panel and a stiff connection between the panels is required to effectively utilise biaxial properties. In this paper, a dovetail splice joint for timber panels is presented using cross-banded LVL with cast concrete grout interlayer. The interlayer allows a tight fit, which is important for stiffness, but also avoiding installation problems due to manufacturing tolerances and moisture-induced dimensional changes. The mechanical behaviour of the dovetail joint was investigated experimentally for various geometries. Furthermore, a numerical model was developed that shows a wide agreement with the experiments, especially in the cases with governing failure in the LVL. Using the numerical model, a parameter study was performed where the influence of the connection length (number of dovetails) and the joint geometry on the strength and stiffness properties was investigated. Besides the optimal geometrical configurations of the dovetail joint, also a significant increase of the strength and stiffness properties with increasing connection length was identified.
Highlights
Cross-laminated timber panels, such as cross-banded laminated veneer lumber (LVL) or cross-laminated timber (CLT), can be produced in large sizes, are characterised by a good dimensional stability and allow biaxial load transfer
Kreis [6] presented a two-way timber-concrete composite plate with beech LVL, tube connectors and intermediate insulation layer to reduce the weight of the slab
This study considers application of the joint to the timber-concrete composite (TCC) slabs, where the timber panels are located in the bottom layer and are mainly loaded in tension
Summary
Cross-laminated timber panels, such as cross-banded laminated veneer lumber (LVL) or cross-laminated timber (CLT), can be produced in large sizes, are characterised by a good dimensional stability and allow biaxial load transfer. There has been interest towards biaxial timber floors sys tems that would utilise panels more efficiently or allow discretely sup ported floors systems. Zollig et al [1] investigated the use of butt-jointing timber panel edges by two-component PU glue, reporting characteristic bending strengths up to 20 MPa. Loebus et al [2] used glued-in reinforcement bars and cast-in-place concrete seam to connect together two CLT-panels for a timber-concrete composite (TCC) slab. Loebus et al [2] used glued-in reinforcement bars and cast-in-place concrete seam to connect together two CLT-panels for a timber-concrete composite (TCC) slab According to their tests on the jointed slab, the bending stiffness was nearly equal and bending moment resistance was around 80% compared to an intact slab. In the vibration and bending tests, 43% increase in fundamental natural frequency and 34% decrease in the deflection was observed by comparing two-way plate and one-way plate
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