枣庄体育场索桁屋盖结构罕遇地震分析技术

Cable-truss Roof Analysis Technology of Zaozhuang Stadium under Rare Earthquakes

枣庄体育场屋盖是由索桁架和刚性压环组成的自平衡体系,其刚度由索系的预应力提供,抗震分析必须基于张拉成型后荷载作用下的结构进行,整个过程需要采用非线性算法。采用商用有限元软件ABAQUS对体育场进行了反应谱及大震时程分析,并编制子程序,对该混合结构进行大震下性能分析,通过损伤因子确定大震下结构抗震性能。

The roof of Zaozhuang stadium is a self-balance structure composed of cable trusses and compressing rings, and their stiffness depends on the prestress of the cables. Seismic analysis was performed based on the load state of the cable that has been stretched, and nonlinear method was used. The finite element software ABAQUS was adopted to analysis response spectrum and seismic time-history of the stadium. Besides, some subroutines were programmed in order to do the composite structure performance analysis under rare earthquake. The seismic performance of the structures under rare earthquake can be determined through the damage factor.