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长春经济开发区的挑篷结构采用塔柱-拉索-钢管桁架结构体系。首先研究了斜拉索布置、预应力度对整体稳定性能的影响,结果表明合理布置斜拉索可以显著提高稳定性能;其次对三种不同的塔柱模型进行稳定分析,结果表明塔柱上设置索撑体系提高了塔柱自身稳定性。计算表明预应力可以有效提高结构承载力和整体稳定性能,节点具有良好的延性性能。罕遇地震作用下的弹塑性时程分析表明,结构在大震作用下拉索仍处于弹性阶段,结构整体尚未进入塑性阶段,具有良好的抗震延性性能。
The canopy structure of Changchun Economic Development Zone adopts a tower column-pull cable-steel pipe truss structure system. Firstly, the influence of the arrangement of cable stays and the degree of prestress on the overall stability performance was studied. The results show that the rational arrangement of cable stays can significantly improve the stability. Secondly, three different tower models are stably analyzed. The results show that the tower column is set up. The sockliner system improves the tower’s own stability. The calculation shows that the prestress can effectively improve the structural bearing capacity and overall stability performance, and the node has good ductility performance. Elasto-plastic time-history analysis under the action of rare earthquakes shows that the structure is still in the elastic stage during the period of large earthquakes. The structure has not yet entered the plastic stage, and it has good seismic ductility properties.