Anti-collapse analysis of irregular steel truss gymnasium based on structural topology
The anti-collapse analysis method of steel truss structure should be matched with the structural topology.For this reason,an irregular(column grid layout and upper truss distribution)steel truss gymnasium was selected for nonlinear dynamic analysis.Based on the level of the axial load in the column and the distribution of the upper cantilever truss,the key components were selected and the method of determining the equivalent load time history curve of the analysis model was given.The ABAQUS/Explicit module was used to simulate the transient response of the structure after the failure of the key components,and the occurrence of progressive collapse is judged according to strength and failure criteria.The analysis results show that the dynamic effect of Ⓔ-axis column failure is higher than that of other regions due to the large area of cantilever structure behind Ⓔ-column.The failure of E1 column and E3 column will lead to the deformation of the structure or the stress ratio of the bar exceeding the limit value.It is suggested that additional support should be added between the columns on the second floor or additional vertical support should be arranged for the cantilever structure outside the Ⓔ-axis column,so as to increase the overall collapse resistance of the structure.
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