1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;
2.Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology),Ministry of Education,Harbin 150090,China;
3.School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;
4.China Enfei Engineering Corporation,Beijing 100038,China
A combined method was developed which can predict the dynamic instability modes and failure load of a single-layer latticed dome according to the seismic instability modes and failure load of a base dome.Firstly,the finite element models of single-layer latticed domes were built to calculate their full time-range seismic responses inclusive of the nodal displacements and the strain energy density of all the elements corresponding to each load step at individual seismic intensities.Then,the combined method was applied to predict both the dynamic instability modes and failure load of unseen single-layer latticed domes based on the dynamic instability modes and failure load of the base domes.The predicted results were compared with the corresponding fine finite element analysis (FEA) results of the unseen domes.To an extent,the developing combined method could be used in predicting the dynamic instability modes and failure load of the similar kinds of single-layer latticed domes with different spans,different rise-span ratios and different member section sizes.Hence,the study explores the application of the method of cell automat (CA) in the analysis and prediction of the instability modes and failure load of single-layer latticed domes,combining with the existing fine FEA numerical data of the domes.
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