Axial compressive creep behaviour of a square steel tube/bamboo plywood composite column with binding bars
Four specimens of a thin-walled square steel tube/bamboo plywood composite hollow column with binding bars (SBCCB) were each subjected to an axial compressive creep test and a subsequent axial compression test to examine their axial compressive creep behavior and post-creep compressive failure modes as well as to analyze the effects of long-term loading on the ultimate axial compression-bearing capacity of the SBCCB. The results show that the axial compressive creep strain decreased with increasing slenderness ratio and increased with increasing axial compressive stress. The creep–time curves of the specimens with various slenderness ratios all exhibited a transient creep stage and a steady-stage stage. Temperature and humidity variations affected local creep behavior. Creep significantly affected the axial compression-bearing capacity as well as the axial and lateral deformability of the SBCCB. The rheological mechanics-based Burgers model can well predict the creep strain development of the SBCCB.