Creep performance and prediction model of bamboo scrimber under compression

In order to study the compressive creep performance of bamboo scrimber, creep tests were carried out on twelve bamboo scrimber specimens. By analyzing the creep growth rate and the parameters in Burgers model, the variation law of compression creep was obtained. The results show that the creep deformation of bamboo scrimber, subjected to compressive loads effect, develops stably and the bamboo scrimber is not destructed under the bearing capacity when the stress level is low. When the stress level is large (reaching 60% of the ultimate load), it will directly lead to the buckling failure of bamboo scrimber, and the creep deformation will show an unstable increase. The growth rate of the compressive creep strain of the bamboo scrimber gradually increases with the increase of time, its growth rate shows a decelerating state and the growth rate also increases as the stress ratio goes up. Based on the results, the variation law of elastic deformation, viscoelastic deformation and viscous deformation in the compression creep test were given. The parameters of Burgers model with different load levels were determined, and the variation law of parameters with stress level was derived. Based on above, a prediction model that takes into consideration the stress level for compressive creep of bamboo scrimber is proposed, and the results are consistent with the test curves. Copyright ©2021 Acta Materiae Compositae Sinica. All rights reserved.