Dynamic characteristics tests show that the natural vibration period of steel frame can be prolonged with the reducing of connection rotation stiffness.

动力特性测试结果表明：随着节点转动刚度的减小，框架自振周期延长。

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This paper presents a new method for calculating the natural vibration period of towers.

本文介绍了一种计算塔设备自振周期的新方法。

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By analysed on vibration theory we knew that the load js a static load in mechanics of materials, when the loaded time is 6-8 times as much than the natural vibration period of the unit of structure.

通过振动理论的分析得知，材料力学中静载荷的定量标准是：当加载时间为构件系统的固有振动周期的8倍以上时，这种载荷即可认为是静载荷。

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