Interface mechanical behaviors and failure mechanism of bamboo scrimber-UHPC composites: test and modelling

The integration of bamboo scrimber with Ultra-High Performance Concrete (UHPC) offers a promising approach to enhancing the mechanical performance of timber-concrete composites while reducing their life-cycle carbon footprint. The structural performance of such composites is strongly influenced by the interfacial properties between bamboo scrimber and UHPC. To investigate these effects, this study conducted a series of push-out tests using various shear connectors to evaluate mechanical behavior and failure modes. The results show that UHPC significantly improves shear capacity, enhances ductility, and lowers slip modulus in the tested specimens. Building on these findings, finite element analysis was performed and validated to further understand the underlying failure mechanisms. A subsequent parametric analysis examined the influence of different shear connectors on shear capacity and failure progression. Finally, the study developed a theoretical model for predicting the shear capacity of bamboo scrimber-UHPC composites, providing practical guidance for structural design and application.