Axial compression behavior of steel tube columns strengthened with fiber reinforced concrete
Through the finite element method,the axial compression performance of steel tube column strengthened with fiber reinforced concrete is studied,and the influence of initial stress of steel tube,slenderness ratio of members,steel ratio,strength of concrete filled on the mechanical performance of the strengthened column is analyzed.The results show that the existence of initial stress reduces the axial compression bearing capacity of the strengthened steel tube column,showing a trend that the greater the initial stress is,the greater the bearing capacity decreases.With the increase of slenderness ratio,the influence of initial stress on the axial compression capacity of strengthened steel tube columns is more significant.Through the introduction of bearing capacity coefficient(Kc),th e influence of initial stress of steel tube on the axial compression bearing capacity of steel tube column strengthened with fiber reinforced concrete is considered.The study finds that initial(K)stress of steel tube and slenderness ratio are the main factors affecting the axial compression bearing capacity of steel tube column,and the influence of steel ratio,strength of concrete filled,etc.is about 2％,which can be ignored when calculating the bearing capacity(Kc).On this basis,a formula for calculating the axial compression bearing capacity of reinforced steel tube columns con-sidering the influence of initial stress is proposed,and the calculated value is in good agreement with the experimental value.
万方数据
维普
