Abstract:
In this study, short-term compressive creep tests were performed on reconstituted bamboo specimens at varying temperatures (10~70℃) over a 6-hour duration using a creep rheometer. The Burgers model and Findley model were employed to quantitatively analyze the regulatory mechanisms of temperature on creep strain, rate, and deformation components. Results indicate that within the 10~40℃ range, creep growth remained relatively gradual. However, when temperatures exceeded 50℃, the creep rate increased exponentially, accompanied by significant buckling failure in specimens. The Burgers model demonstrated high accuracy with adjusted coefficients of determination exceeding 0.90, effectively characterizing the viscoelastic creep behavior of reconstituted bamboo, while the Findley model proved reliable for simplified engineering estimations. Further analysis revealed that elevated temperatures reduced the proportion of elastic deformation from 79.5% to 61.1%, with notable increases in viscoelastic and viscous deformation components by 1.298 times and 1.191 times, respectively. The softening effect observed near 50℃ was attributed to the glass transition of hemicellulose. Time-temperature equivalence analysis showed that the Arrhenius equation governed creep behavior within 20~40℃, whereas a fractional derivative model was required to correct nonlinear creep behavior above 40℃. These findings provide critical insights for predicting long-term deformation and ensuring the safe application of reconstituted bamboo structures in temperature-varying environments.