This essay is based on a calculation example, to analyse it with the help of SAP2000, then discuss the relationship of the change of internal forces of different structural memebers and nodal displacements with the change of various load sizes for cable dome of Geiger system, obtain the static structural characteristics of such cable dome system. With the analizing of the calculation results, conclude the point that should be noted seriously when designing cable dome of Geiger system-the inner ring of cable is very easy to relax, at the same time discusses the solution to this problem. Then the effectiveness of the approach of replacing the easy-to-relax cable with rigid cable by analyzing an example is demonstrated.%从一个算例出发,运用sap2000对算例进行计算.讨论盖格体系索穹顶各节点位移以及各构件内力随荷载大小的变化情况,得出盖格体系索穹顶的结构静力特性.从对计算结果的分析,得出盖格体系设计时需十分注意的问题——内圈脊索很容易松弛,并对解决这一问题的方法进行探讨,且以一个实例论证用劲性索替换容易松弛的索这一方法的有效性.
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