This phenomenon is all existed under various kinds of optimization criterion of the progressive structural optimization design.

在渐进结构优化设计的各种优化判据下都存在这一现象。

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A vibration failure mode of structural system was presented according to engineering design criterion. The safety margin equation of the vibration failure mode was developed.

从工程上常用的振动设计准则出发，定义了振动问题的破坏模式，给出了以结构自振频率和外载频率为基本随机变量的安全边界方程。

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There is no criterion of design and references to the structural design of blast resistant doors, so lack of security or being too conservative may appear in the design.

抗爆门结构设计尚无现成设计标准、规范可循，设计结果可能会出现安全性不足或过于保守等情况。

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