Study On Axial Compression Properties Of Bamboo-Timber Composite Hollow Columns

As a new type of green building material,glulam wood is attracting more and more attention.In order to improve the utilization rate of wood and bamboo and to improve the mechanical performance of wood columns,two types of glued wood columns,namely hollow glued wood column and bamboo-wood composite hollow column,were made in this paper by using the common pinus sylvestris and nanzhu bamboo pieces as raw materials and two-component water-based adhesive as adhesive.Firstly,the compression test of wood and the tensile test of bamboo were carried out,then the axial compression test of hollow glued wood column and bamboo-wood composite hollow column was carried out,and the finite element numerical simulation analysis was carried out with ABAQUS software to study the axial compression performance,the results can provide reference for the engineering application.The main achievements of this paper are as follows:(1)Through the axial compression test of 3 hollow glued wooden columns and 3 bamboo-wood composite hollow columns,the displacement,strain data and failure patterns of the two columns were obtained.By means of data regression analysis,the regression equations between stress and strain of hollow glued wood column and bamboo composite hollow column were established respectively.Finally,the stability coefficient of two groups of glued wood columns under axial compression is compared and analyzed according to two domestic standards.The results showed that the two groups of specimens both had strength failure,the failure modes of hollow glued wood column and bamboo-wood composite hollow column were different,the failure phenomenon of bamboo-wood composite hollow column was not obvious,and the wood buckling phenomenon was greatly reduced.The reinforcing effect of bamboo slice layer on wooden pillar is remarkable.Compared with hollow glued wooden column,the bearing capacity of bamboo-wood composite hollow column under axial compression is increased by 20.1%,the longitudinal displacement ductility is increased by 30%,and the lateral displacement ductility is increased by 40%.The stability coefficient of axial compression was calculated by using the "design standard of wood structure" and "technical specification of glued wood structure" respectively.The compression stability coefficient of bamboo-wood composite hollow column was 1.08,which was 20%higher than that of hollow glued wood column.(2)The ABAQUS software was used to establish the finite element models of hollow glued wood column and bamboo-wood composite hollow column respectively,The axial compression performance of the two groups of wood columns was analyzed.The stress and strain cloud maps were obtained,and the calculation is compared with the test results,and the two are in good agreement.The performance improvement effect of bamboo-wood composite hollow column is similar to the experimental results.