Axial Compression Performance Of Bambooplywood And Thin-Walled Steel Tube-Encased Dust-Powder Concrete Composite Column

With the rapid development of engineering construction in China,Large quantities of concrete are consumed every year.In the process of mining and crushing small particles of pebbles and sand,a large amount of stone dust and waste are produced.Dust powder usually needs to be landfilled,which occupies land and pollutes the water and soil,seriously endangering the ecological environment.The scientific treatment of dust powder has become an important challenge affecting sustainable development.At present,there are very few studies on the application of dust powder.It is imperative to explore the application research of dust powder.Bamboo resources is very rich in China,but the utilization of these resources is very low.the successful development of bamboo scrimber and glued laminated bamboo has broadened the application of bamboo in the engineering field.This paper develops and utilizes bamboo plywood and dust powder based on the existing research,low-strength dust-powder-containing concrete was poured into a composite hollow column to improve the design of a new type of bamboo plywood and thin-walled steel tube dual-confined dust powder concrete composite column(BSDCC).Ten BSDCC specimens were designed and tested under axial compression.Simulation analysis is carried out using ABAQUS software.Investigate the effects of the dust powder concrete content ratio and strength,specimen slenderness ratio,cross-sectional composition and binding bar confinement pattern,and binding bar spacing ratio on the bearing capacity and deformation of the specimen.The damage characteristics and morphology of the specimen are analyzed.The results indicated that the compressive failure modes of BSDCC are mainly glue failure of the bamboo plywood and the bamboo plywood,the bamboo plywood and the thin-walled steel tube between the binding bars,and the material broken damage of the bamboo plywood in the middle of the specimen.The content rate of dust powder concrete has no significant influence on the ultimate bearing capacity of the specimen,but has an important influence on the deformation,and the failure mode of the specimen is changed.The bearing capacity of specimens increases with the increasing concrete strength and the constraint of section combination mode on the bamboo plywood,and decreases with the increase of the slenderness ratio and the spacing ratio of the binding bars.A calculating model for the axial compression bearing-capacity of BSDCC was proposed through the regression analysis.