By using a four-layer model, the stabilities of ME type spiral sector transition region in the interplanetary magnetic field are discussed.

本文利用四层模式，讨论了ME型行星际磁场螺旋扇形过渡区的稳定性。

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There are four key points of plate spiral stair design, and they are model building, inner force calculation, overall stability analysis and joints design between the stair and the main structure.

对板式钢结构旋转楼梯的有限元计算进行了全面的分析，并对其与主体结构的连接节点进行了设计。

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