Axial Compression Performance Of H-Shaped Steel-Glulam Composite Column

Based on the green prefabricated building concept advocated by China and the relevant research progress of steel-timber composite(STC)structure and concrete composite structure,this paper proposes a STC column which is formed by gluing built-in H-shaped steel and outsourcing glulam.To explore the feasibility and superiority of its application in engineering as well as provide a theoretical basis for the further study of STC structures,this paper did the following research:In this paper,axial compression tests were carried out on 4 pure steel,4 pure timber column specimens with lengths of 500 mm,1100mm,1700 mm and 2300 mm respectively,and 10 STC column specimens of 2 different types.By comparing the test phenomena of each specimen,different failure modes were obtained.By analyzing the load–axial displacement curve,load–lateral deflection curve and load–axial strain curve,the relationship between the length of the specimen and the axial compression performance was obtained,and it was proved that this composite method can limit the buckling of the steel to some extent,and it was believed that the direction of the assembly of laminates will affect part of the mechanical properties of the STC column specimen.At the same time,the concepts of linear stiffness,yield strain,yielding range and ductility were introduced,which revealed the mechanical behavior of the STC column specimen and described its stress mechanism when it reached various strain stages.The composite effect between the steel and timber was also discussed from the perspective of peak load.On the other hand,in this paper,the finite element software ABAQUS was adopted to perform numerical simulation analysis on the STC column,and the results showed that it was in good agreement with the test.According to the model,the parameters that may affect the axial compression performance of the STC column(column slenderness ratio,section steel ratio and steel yield strength)were analyzed and suggestions for improvement were given.Finally,the applicability of the current codes(Code for Design of Timber Structures and Code for Design of Steel Structures)to the calculation of the peak loadcarrying capacity of STC columns was discussed,and a formula for calculating the stability factor of the full-slenderness-ratio STC column was also proposed.