Axial Compressive Performance and Bearing Capacity Calculation for T-shaped Cold-Formed Thin-Walled Steel Built-Up Columns
Cold-formed thin-walled steel(CFS)fully bolted plate connection T-shaped built-up column is a new type of composite section column,which bears concentrated load in the frame structure with full bolt connection.The research on the axial performance of T-shaped CFS composite columns with full bolt connection is still limited.Based on the existing experimental research results,an accurate and reliable numerical analysis model of a T-shaped CFS composite column is established.The parameters such as slenderness ratio,plate thickness,and longitudinal spacing of the backing plate are selected for variable parameter analysis.The influence of various important parameters on the ultimate bearing capacity and buckling mode of the composite columns is further studied.The results show that with the increase in slenderness ratio,the buckling mode of the T-shaped CFS composite column gradually changes from local and distortion-related buckling to overall buckling.When the slenderness ratio<104.7,the influence of the slenderness ratio on the bearing capacity of the component is not obvious.The plate thickness has a significant impact to the bearing capacity,and the buckling mode can be changed when the slenderness ratio is large.The longitudinal spacing of the backing plate has little effect on the bearing capacity and buckling mode,and the ultimate bearing capacity of the members with different plate spacing is within 4.5%.Finally,the test and numerical analysis results are compared with the nominal bearing capacity calculated by the direct strength method in the North American code to evaluate the applicability of the direct strength method for the bearing capacity calculation of this type of composite columns.
万方数据
维普
