English：

The east terminal of Xi’ an Xianyang International Airport is composed of a centralized mainbuilding and six corridors. The roof of the main building adopts the orthogonal steel grid structure, whichis supported by 56 Y⁃shaped steel columns and 56 curtain wall steel columns. The construction scheme offloor assembly, partition lifting and positioning, and embedded component closure is adopted. In order toevaluate the progressive collapse resistance of large⁃span roof steel structures under the failure of load⁃bearing components, 28 typical single column removal conditions were selected for analysis of equivalentstatic, elastic⁃plastic dynamic time history and vertical static elastic⁃plastic. The research shows that thelarge⁃span steel roof structure remains elastic under single column removal condition, the verticaldeformation and component stress level are in limited range, and the anti⁃collapse performance is good.The dynamic amplification factor is 2 0, which can safely estimate the dynamic response of the structurewhen a single column fails. Under the condition of removing the inner Y⁃shaped middle column, the anti⁃collapse coefficient of the structure is low. Under the condition of removing the column of the outercurtain wall, the anti⁃collapse coefficient of the structure is high.