Compressive stress-strain relationships of laminated bamboo under service temperature

Laminated bamboo is a novel green building material, understanding its mechanical properties at service temperatures is essential for structural safety and optimal design. However, currently there is no constitutive model capable of effectively predicting the compressive stress-strain relationship of laminated bamboo under the influence of service temperatures. This paper examines the influence of service temperature on the compressive stress-strain relationship in laminated bamboo. The compressive properties of laminated bamboo severely decreased as the temperature rises. Based on the fundamental form of the Weibull cumulative distribution, a constitutive model is proposed. Additionally, four constitutive models previously successfully applied to laminated bamboo or other bamboo composites were modified and analyzed for their capability to predict the compressive stress-strain relationship of bamboo-based materials under different temperature. Among all the models, the proposed Weibull model and the modified RA mode have higher accuracy, and both can simulate strain hardening and thermal softening characteristics of laminated bamboo. The findings of this study not only guide the application of bamboo-based engineered materials in actual engineering structures, enhancing the precision and safety of structural designs but also provide valuable references for the research and application of other bamboo composite materials.