Elasto-plastic Time History Analysis Of Long-span Spatial Structure

Long-span spatial structures are widely used in public buildings, such as stadium and gymnasium. These structures are often of high safety level, the failure of which may cause huge lose of properties and even human's lives. Therefore, the seismic performance should be studied carefully for long-span spatial structures.Under strong earthquake, members may yield by tension or buckle by compression. In order to consider the buckling and postbuckling behaviour of members, the hyperesis model for axially loaded members is studied by nonlinear finite element analysis and the model was dimplified for practical use.Laoshan cycling gymnasium and Beidaihe railstation are then taken as case studies in this paper. The behaviours of the long-span double layer latticed dome and the tridimentional steel truss arch under strong earthquake are analysed with elasto-plastic time history analysis. Earthquake along both vertical and horizontal directions are considered and El-centro and Tianjin earthquake wave are taken as input.The study shows that both structures have good earthquake resistance performance. Under strong earthquake of design intensity, some members yield while the structures are safe from collapse. Considering of member buckling results in more plastic hinges, but has little effect on dynamic displacements. It is also noted that member buckling may cause failure of the structures under strong earthquake and lower the capacity of the earthquake resistance of the structure.