ABSTRACT
ABSTRACT: A new large-span double-arch-support steel structure whose arch foots’ span is 257 m is applied in the design of a large stadium, which is combined with the upper tube arch (large diameter) and lower space arch (triangle truss). The design concept and structure system is described firstly. And then, the stability analysis is calculated by Strand7 FEA software. Stability analysis steps: (1) according to engineering experience, the first overall bucking modes and linear buckling load is determined in the eigenvalue buckling analysis; (2) a consistent initial defect L/300 is imposed on the mode in the geometric nonlinear analysis; (3) the major factors (the slenderness ratio of upper arch and the prestress degree of limit cable) are taken into account in the effect of elastic stability. The main results of stability analysis are shown in detail.
