An Investigation of the Structural Behaviour of Mechanically Jointed Azobe Beams Using Steel Dowels
Understanding the Key Factors Influencing Load-Bearing Strength in Mechanically Jointed Azobe Beams Using Dowels: An Experimental and analytical Approach
A. Kawuki (TU Delft - Civil Engineering & Geosciences)
J. W. van de Kuilen – Mentor (TU Delft - Bio-based Structures & Materials)
Geert Ravenshorst – Graduation committee member (TU Delft - Bio-based Structures & Materials)
PA de Vries – Graduation committee member (TU Delft - Macromechanic Laboratory)
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Abstract
This research investigates the structural behaviour of multilayered Azobé timber beams mechanically jointed using steel dowels. Driven by increasing limitations in the availability of large-section hardwoods and the necessity for sustainable material use in construction, the study focuses on understanding the composite action and effective bending stiffness of such assembled beams. Experimental testing including four-point and three-point bending tests was performed on both individual lamellae and mechanically jointed beam configurations to determine the global and local Modulus of Elasticity (MOE), interlayer slip, and Effective stiffness EIeff. The results were compared against analytical predictions derived using the gamma-method as per Eurocode 5 as suggested by Möhler in the Din 1052, complemented by Schelling’s extension for multilayer systems. The findings indicate that the theoretical models often underestimate the gamma values of dowelled Azobé beams in some cases and in other cases underestimate them , and show that slip modulus Kser values which show the stiffness in the joints differ from those suggested in current standards (Eurocode 5)being far lower than calculated. The research concludes that while current analytical approaches provide a useful baseline, they may require refinement to more accurately reflect the performance of high-density hardwoods such as Azobé.