تحليل رفتار تير مركب چوبي-چوبي به روش اجزاي محدود

For many years, composite structures have attracted considerable attention in the construction industry due to their numerous advantages, including reduced dead load, improved ductility, an‎d increased energy efficiency. These systems are formed by combining different materials that act compositely through mechanical connectors. However, permanent connectors such as welded studs limit the disassembly an‎d reuse of composite beams, leading to environmental an‎d economic drawbacks. In contrast, screw-type shear connectors not only preserve composite action but also reduce construction time an‎d enable the development of lightweight an‎d sustainable structural systems. This study focuses on timber–timber composite beams in which wooden elements are connected using screw-type shear connectors to achieve an integrated structural response. In this research, the behavior of timber–timber composite beams equipped with screw shear connectors was investigated through four numerical models developed in ABAQUS. The numerical model was first constructed an‎d validated using the results of four experimental specimens. After validation, a series of parametric studies was performed to examine the influence of factors such as screw diameter, screw strength, an‎d timber dimensions. The results showed that the type an‎d spacing of shear connectors, together with the geometric dimensions of the CLT (Cross Laminated Timber) slab an‎d LVL (Laminated Veneer Lumber) beam, have a significant effect on the flexural performance of the composite system. Increasing the screw diameter an‎d slip stiffness improved the initial stiffness, reduced relative slip, an‎d enhanced the ultimate load-bearing capacity, whereas larger connector spacing weakened the composite interaction between the slab an‎d beam. Additionally, increasing the width an‎d thickness of the CLT slab as well as the thickness of the LVL beam resulted in higher bending stiffness, reduced mid-span deflection, an‎d a greater ultimate capacity. Overall, these findings highlight the importance of optimizing connector configuration an‎d timber component geometries in order to improve the structural performance of CLT–LVL composite beams, an‎d they demonstrate that the developed numerical models provide a reliable tool for their analysis an‎d design.

5

158919