The author proposed a method to calculate approximatebuckling load factors of single-layer and 1.5-layer spaceframes, instead of doing complex analysis anymore, andthis paper demonstrated that the promoted method iseffective. The analysis result showed that the approximatebuckling load factors equation obtained by the nonautomaticstructural design is reliable, and the differencebetween the approximate solution and the analysissolution does not exceed 0.5. It can be also used for theapproximate calculation of the buckling load factors of theautomatic structural design, but this calculation differenceincrease as the span increases especially at 40mx40m ormaybe a larger span, so it is necessary to adjust thecoefficients of the approximation equation.However, the basic theory of mechanical andgeometrical demonstration remains for further research.In addition, the authors will extend this research toevaluate the buckling load factors of various types ofspace frames in further research.
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