Stability analysis of Sun Valley steel structure for the Expo Axis project

The single-layer lattice structures of the Sun Valleys for Expo Axis project have complicated curved surface with huge dimensional size and large cantilever span,so overall stability is one of key problems in structural analysis and design.The rationality for introducing the eigenvalue buckling mode as the distribution pattern of initial geometric imperfection was discussed,and the overall stability behavior of the single-layer lattice structure was then investigated through nonlinear finite element analysis.The effect of single member buckling on structural ultimate load-bearing capacity was also examined.It is shown that,the critical buckling loads from both geometrically nonlinear analysis and geometrically and materially nonlinear analysis meet the requirement of relevant codes,so the San Valley steel structures have good overall stability bearing capacity.The Sun Valley steel structures are not sensitive to initial geometric imperfections in general,and the tensile forces from cable-membrane structure further reduce the imperfection sensitivity.Removal of local members due to buckling will not lead to a sudden loss of overall bearing capacity,indicating that the structure has a good load-bearing behavior.