Effect of temperature on compressive mechanical properties and strength design index of reconstituted bamboo

Abstract

AbstractThe effect of temperature on the compressive properties of recombinant bamboo was analyzed. At different temperatures (10 ~ 70°C), the failure mode, basic mechanical properties, stress–strain model, and design value of the compressive strength of hot‐pressed reconstituted bamboo were investigated through axial unidirectional compression tests. The results indicate that with a rise in temperature, the reconstituted bamboo material changes from brittle to ductile, showing three failure modes: splitting failure, shear failure, and buckling cracking failure. The ultimate compressive strength of reconstituted bamboo decreased from 79.96 to 40.81 MPa, a decrease of 48.96%, and the compressive strain of reconstituted bamboo increased from 0.0069 to 0.0120, an increase of 72.16%. Based on the Richard‐Abbott model, the function relation between the elastic modulus reduction factor (λE1,T) and the post‐yield modulus reduction factor (λE2,T) of bamboo compression specimens and the temperature were obtained. A model of the design value of the compression strength considering temperature was established, and the design value of the compression strength was evaluated.