The finite element method was used to analyze the continuous collapse of a long-span steel structure. Using the energy method and the mean stress method to determine the position of the failure column, the continuous collapse analysis of 22 and 11 columns was selected under the influence of the train running and other accidental loads. The results showed that the maximum structure strain was 2.38×10-3, which was less than the ultimate tensile strain of steel. Among them, the maximum stress of the elevated layer was generated from the column 11 near column 12 and column 21, and the maximum stress strain of the net shell appearred in the column of the failure column and the failure column of the adjacent zone. When the single pillar 22 failed, the strain maximum was 3.68×10-3, and the maximum strain of the beam element near the failure column was less than that of the ultimate tensile strain of material. The maximum stress strain of the housing reticulated shell was found in the column 11 supporting the external bridge and the adjacent net shell elements;When the double column 11 and the column 22 failed simultaneously, the maximum strain of the structure was 5.78×10-3, which was greatly increased compared with the failure of the single column. The plastic deformation occurred and the value was still below the ultimate plastic strain of the material. The failure of the double column could not lead to the continuous collapse of the overall structure.
stress and strain