Compressive behavior of glued laminated bamboo at elevated temperatures: experimental evaluation and damage constitutive model

Glued laminated bamboo (GLB), recognized as a sustainable and eco-friendly construction material, is increasingly being utilized in the construction industry. This study presents an investigation into the compressive performance of GLB parallel to the grain across a temperature range from 20 °C to 250 °C. The research analyzed the failure modes, stress-strain curves, compressive strength, and elastic modulus of GLB. The findings of the research indicate that as the temperature increases, the failure mode shifts progressively from fiber buckling to delamination of the glued layers. Both the compressive strength and the elastic modulus show a gradual decline, with reductions of 89% and 87%, respectively, at 250 °C. A damage constitutive model, which incorporates thermal and mechanical damage variables based on the three-parameter Weibull distribution, is proposed. The validity of the proposed model is confirmed through comparative analysis with experimental data. The study concludes with a discussion on the damage evolution of GLB under elevated temperatures and compressive loads, offering valuable insights for the structural application of GLB material at elevated temperatures.