本文分析推导了应力分界圆与临界起皱压应力、危险断面径向拉应力之间的关系，以及对临界起皱的影响。
This paper makes an analysis on the relation of the stress boundary with the critical tangential compressive stress as well as on its influence on critical internal wrinkling.
暗穴临界安全厚度随着暗穴断面尺寸、暗穴半径收敛值、安全系数、地面荷载等参数的增大而增大。
The critical safety thickness of hidden cavity increases with the augment of hidden cavity section size, radial constringency, safety coefficient and surface loading.
当头部形状或开槽宽度不合适时，中间开槽不但不能提高颤振临界风速，反而降低了断面的颤振稳定性。
When the head's shape or width of central slot is unsuitable, central slot decreases critical flutter wind speed instead of increasing it.
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