| With the deepening of the concept of low-carbon environmental protection and green building,building materials such as bamboo and timber are increasingly favored by people.Modern timber structures have been widely used in China and abroad due to their advantages of simple construction,short construction period,environmental protection,energy saving and excellent seismic performance.Aluminum-timber composite structure is a kind of structure composed of aluminum and timber.It has the characteristics of environmental protection,low carbon,light weight,good seismic performance and corrosion resistance.At present,steel-concrete composite structure and steel-timber composite structure have been widely used and studied at home and abroad.However,the self-weight of steel-concrete composite structure is large and steel is prone to corrosion.The development of these two composite structures will be hindered in the environment of high humidity.In view of this,based on the advocacy of the concept of green prefabricated buildings in China in recent years,this paper proposes an aluminum-timber composite column(ATC)composed of larch plytimber and aluminum alloy pipes by drawing on steel-concrete composite structure and steel-timber composite structure,and studies its axial compression mechanical properties and numerical simulation analysis.The main research contents are as follows:(1)The elastic modulus,yield strength of aluminum alloy,compressive strength,Poisson ’ s ratio and elastic modulus of timber were measured by room temperature tensile test and timber property test,and the failure mechanism of the material was analyzed.(2)A total of 21 timber columns,aluminum tube columns and aluminum-timber composite columns in seven groups were tested under axial compression.The failure modes of each group of specimens were compared and analyzed.The variation laws of longitudinal strain,transverse strain,lateral displacement and ultimate bearing capacity of specimens with the thickness of aluminum tube and slenderness ratio were studied,and the failure mechanism of aluminum-timber composite columns was discussed.The results show that the ultimate bearing capacity of aluminum-timber composite columns is 12.6%～121.6%higher than that of pure wood columns.Due to the constraint of aluminum tube,the wood is in a three-dimensional compression state,and the initial stiffness of the composite column is improved.The increase of aluminum tube thickness can improve the overall stability of the composite column.(3)The ultimate bearing capacity of aluminum-timber composite columns was studied by comparing the theoretical calculation formulas of domestic code and American code.The results show that the average error between the calculation results of domestic code and the experimental value is 11.00%,and the average error between the calculation results of American code and the experimental value is 14.98%.The two calculation methods are in good agreement with the experimental value.(4)The eigenvalue buckling analysis and nonlinear buckling analysis of ATC column were carried out by ABAQUS finite element analysis software,and the analysis results were compared with the experimental results.The results show that the finite element simulation results are in good agreement with the experimental results. |
