Cross-laminated timber panels (X-lam) are more and more used as construction material for buildings. For a sound and reliable structural analysis in both static and cyclic loading situations, the behaviour of connections between wall panels has to be evaluated. As the Xlam panels are very rigid, these connections are determining significantly the mechanical performance of X-lam buildings. A typical in-plane wall-to-wall connection makes use of an LVL strip that is mounted as an inlay along the edges of two notched panels and is connected to these two panels by single shear fasteners, for instance self-drilling screws. As a consequence, the static and dynamic behaviour of this connection type differs from panels that are directly connected to each other due to the LVL strip and the subsequent double row of single shear fasteners. The LVL-inlay joints have to be modelled as a serial system of single shear fastener springs. Therefore, monotonic and cyclic tests on such connections have been undertaken in order to get input parameters for subsequent design models. Bending angles of fasteners have been measured. A comparison of the test results with dynamic measurements and calculations on a 3-storey building has resulted in the conclusion that in-plane wall-to-wall panel connections are an important factor in the structural behaviour of X-lam buildings, especially under dynamic loading such as earthquakes. Design procedures dealing with EC5 and EC8 concerning this connection type are discussed and their applicability is evaluated.
Analysis of X-LAM panel-to-panel connections under monotonic and cyclic loading
CECCOTTI, ARIO
2009-01-01
Abstract
Cross-laminated timber panels (X-lam) are more and more used as construction material for buildings. For a sound and reliable structural analysis in both static and cyclic loading situations, the behaviour of connections between wall panels has to be evaluated. As the Xlam panels are very rigid, these connections are determining significantly the mechanical performance of X-lam buildings. A typical in-plane wall-to-wall connection makes use of an LVL strip that is mounted as an inlay along the edges of two notched panels and is connected to these two panels by single shear fasteners, for instance self-drilling screws. As a consequence, the static and dynamic behaviour of this connection type differs from panels that are directly connected to each other due to the LVL strip and the subsequent double row of single shear fasteners. The LVL-inlay joints have to be modelled as a serial system of single shear fastener springs. Therefore, monotonic and cyclic tests on such connections have been undertaken in order to get input parameters for subsequent design models. Bending angles of fasteners have been measured. A comparison of the test results with dynamic measurements and calculations on a 3-storey building has resulted in the conclusion that in-plane wall-to-wall panel connections are an important factor in the structural behaviour of X-lam buildings, especially under dynamic loading such as earthquakes. Design procedures dealing with EC5 and EC8 concerning this connection type are discussed and their applicability is evaluated.
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