A Study on the Mechanical Properties of T-type node Chimonobambusa tumidissinoda J. R. Xue & T. P. Yi ex Ohrnb

This study focused on the Chimonobambusa tumidissinoda J. R. Xue & T. P. Yi ex Ohrnb T-type node. To address the issue of insufficient joint strength caused by the narrow bamboo cavity and low tensile strength of the transverse layers, the study employed a reinforcement scheme involving “pre-embedded metal nuts ethyl α-acetylcyanoacrylate adhesive consolidation” to address the issues of narrow bamboo cavities and low tensile strength of the transverse rings, which result in insufficient joint strength. Three specifications of nut-filled test specimens M6 × M10 × L10, M6 × M10 × L15, and M6 × M10 × L20 were designed and fabricated. Through bending and pull-out tests, the effects of each nut specification on the T-type node ultimate load-bearing capacity and deformation capacity were determined. The results show that, in terms of bending performance, the M6 × M10 × L10 specimen achieved the highest average maximum failure load of 227.63 N and exhibited the best structural stiffness and stability; in terms of pull-out performance, the M6 × M10 × L15 specimen achieved the highest average maximum failure load of 160.28 N and demonstrated the best stability within its group. Failure mode analysis showed that under bending loads, the specimens primarily exhibited two failure modes: longitudinal splitting of the bamboo and delamination at the interface between the nut and the adhesive; under pull-out loads, the specimens primarily exhibited the same two failure modes: longitudinal splitting of the bamboo and delamination at the interface between the nut and the adhesive. In summary, it is recommended to use the M6 × M10 × L10 configuration for T-type node dominated by bending and the M6 × M10 × L15 configuration for T-type node dominated by shear that require high stability. This study clarified the influence of nut length on the load-bearing capacity and failure modes of Chimonobambusa tumidissinoda J. R. Xue & T. P. Yi ex Ohrnb T-type node, providing experimental evidence for the reinforcement of furniture T-type node made from this bamboo species, as well as a reference for their standardization, demountability, and large-scale mechanical production.