Experimental and Analytical Study on the Bending Behavior of Laminated Bamboo Sandwich Structures with Diverse Lattice Core Geometries

摘要

To enhance the utilization and development of bamboo resources and promote their application in engineering, this study designed four types of laminated bamboo sandwich panels with distinct lattice cores: triangular, square, and Kagome configurations. The panels were fabricated using laminated bamboo as the raw material and manufactured via two methods: interlocking and partitioning. Four-point bending tests were conducted on the sandwich panels with different lattice cores to evaluate their flexural performance. The failure mechanisms under bending load were analyzed, along with variations in mid-span deflection, bending stiffness, and ultimate load-bearing capacity. The specific stiffness and specific strength of the four sandwich panel types were also compared.A finite element model of the four-point bending test was established using ABAQUS software to perform numerical simulations. The results indicated that all three interlocked lattice-core sandwich panels exhibited shear failure during bending. Among them, the triangular lattice panel demonstrated the highest load-bearing capacity and the greatest specific strength. In contrast, the partitioned square lattice panel failed due to compressive yielding of the top layer and tensile damage of the bottom layer. Its load-bearing capacity and specific strength exceeded those of the three interlocked panels, showing improvements of 21.6 % and 43.6 %, respectively, compared with the interlocked triangular lattice panel.The numerical simulations showed good agreement with experimental results, with an error margin of less than 5 %, confirming the model’s ability to effectively predict the bending behavior of laminated bamboo sandwich panels. These panels exhibit excellent flexural performance, leveraging the advantages of laminated bamboo—light weight and high strength. The findings provide a viable structural form and a theoretical basis for expanding the use of bamboo in engineering applications