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采用非线性有限元法建立了索穹顶逆向施工全过程分析方法,通过改变主动索和辅助索的索长来实现索穹顶的整体逆向提升。采用索杆梁模型模拟索穹顶,主动索和辅助索为2节点索单元,被动索为5节点索单元,桅杆为杆单元,中央环梁为梁单元。索长改变通过施加温度荷载实现,整个分析模拟了结构从理想平衡状态到中央环梁放至地面的施工全过程。采用该方法可使所有构件在地面组装完成后整体逆向提升,避免了边张拉、边安装,节省时间,同时避免了模拟分析过程拓扑的不断变化。
Nonlinear finite element method was used to establish the whole process of cable dome reverse construction, and the overall reverse of cable dome was achieved by changing the cable length of active cable and auxiliary cable. The cable dome model was used to simulate the cable dome. The active cable and the auxiliary cable were 2-node cable units, the passive cables were 5-node cable units, the mast was the rod unit and the central ring beam was the beam unit. Cable length change by applying temperature load to achieve the analysis of the entire structure from the ideal balance to the central ring beam to the ground of the entire construction process. By adopting the method, all the components are lifted upwards in the reverse direction after being assembled on the ground, the edges are pulled and the installation is avoided, and the time is saved; meanwhile, the topology of the simulation analysis process is avoided to be continuously changed.