指设计时应满足的刚度条件。是指固体材料在外力作用下抵抗变形的能力。
化学反应器不仅要满足强度条件，以保证在使用中不发生断裂破坏；也要保证刚度条件，使设备在正常操作时的弯曲变形不超过规定的许可范围。
Reactors used in chemical industry must satisfy rigidity requirements to ensure the bending distortion to be controlled within the tolerated range as well as strength requirements to prevent breakage.
在负刚度条件下，该法是收敛的和条件稳定的。
In the case of negative stiffness, the method is convergent and conditionally stable.
除强度条件外，环境刚度条件是发震的另一必要条件。
Besides the strength condition, the environmental stiffness condition is another one necessary for shock-generation.
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