It is generally understood that hybrid timber columns have high performance in terms of stiffness, strength, and deformation capacity. However, there have been no specific papers produced examining the buckling strength of hybrid timber columns. The purpose of this paper is to evaluate the buckling strength of hybrid timber columns reinforced with steel plates and carbon fiber sheets. The steel plates and carbon fiber sheets are attached to the outside of the timber column about the buckling axis. The steel plates are attached using lag screws; the carbon fiber sheets are attached using glue. The influential parameters in the buckling test are the reinforcing materials (the steel plates and carbon fiber sheets), the slenderness ratio, and whether the reinforcing materials at the end of the hybrid timber column have a direct axial force. Finally, considering flexural stiffness between the timber column and the reinforcement, design formulas for different slenderness ratios are proposed for the buckling strength of hybrid timber columns.
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