大型显示屏支撑结构抗震分析与节点性能研究

Seismic performance analysis and joint behaviour research of the supporting structure of large screen

根据三个水准抗震设防目标研究大型显示屏支撑结构的抗震特性,提出相应水准目标下的设计原则。采用SAP2000软件分析三个水准目标下支撑结构的变形及应力特性,研究支撑结构单体计算时与考虑主体结构影响进行整体计算时的差别。结合"强节点弱构件"的失效机制采用ANSYS软件进行节点深化分析。结果表明,支撑结构平面变形受主体结构的影响较大,计算时应考虑主体结构的影响,支撑结构的竖向变形采用底层支撑节点变形控制,其竖向布置应避开主体结构薄弱层,支撑节点构件可通过在内部设置十字形加劲肋提高承载力。

According to the three earthquake performance objectives, the seismic performance of the supporting structure of large screen was analyzed, and the seismic design principles for corresponding objectives were proposed. Using the finite element analysis program SAP2000, the deformation and stress characteristics of the supporting structure were analyzed, and the differences between separate calculation model and global calculation model taking into account the main structure influence were studied. The joint failure mechanism based on the general design rule of ＂strong joint, weak member＂ was investigated deeply by ANSYS. The simulation results show that the main structure has great influence on the plane deformation of the supporting structure and the influence of the main structure on the calculation of the supporting structure should be considered. The vertical deformation of the supporting structure was controlled by the deformation of the underlying supporting joint, and the vertical layout of the supporting structure should avoid weak position of the main structure. The bearing capacity of the supporting joint could be improved by the internal cross stiffener.