Research on Calculated Length Coefficients of Columns with Variable Sections in Shenzhen Dayun Transportation Hub

To conduct further research on the calculated length coefficients of columns with variable sections, the existing calculation methods of the calculation length factors of columns with variable sections were verified through numerical simulations. Taking the Shenzhen Dayun Transportation Hub as the engineering background, numerical simulations of buckling of variable-section compression members in the overall structure and individual members were conducted. The calculation length coefficients of three compression members in the project were calculated, and the constraints conditions were obtained for reference in actual engineering. Based on this, the parameter analysis was conducted under the boundary conditions of one end fixed and the other end hinged, and one end fixed and the other end free, and the empirical calculation formula for the calculation length coefficient of the members under these two boundary conditions was obtained. The results showed that as the ratio of the inertia moment of the upper and lower ends decreased, the calculation length coefficients of the variable-section compression member was smaller than that of the equal-section compression member, indicating that the buckling of the member was constrained, and the material properties was fully utilized.