Abstract
紧固件的松动会破坏输电铁塔的完整性，甚至导致输电铁塔的彻底倒塌。本文主要研究了预紧力、温度、振幅及频率四个主要因素对输电铁塔紧固件松动行为的影响，并揭示了螺栓在上述四个主要因素影响下的松动机制。研究结果表明：提高预紧力、降低温度和减小振幅可以有效抑制螺栓的松动，常规频率对螺栓的松动行为影响较小。 The loosening of fasteners commonly destroys the integrity and even lead to the collapse of the transmission tower. In this paper, the effects of four main factors, including pre-load, temperature, amplitude and vibration frequency, on the loosening behaviors of 6.8 grade M20 hot dip galvanized bolts were investigated as well as the mechanisms behind them. The results show that improving pre-load, reducing temperature and decrease vibration frequency can effectively restrict the loos-ening of the 6.8 grade M20 hot dip galvanized bolt. However, the conventional vibration frequency exhibits little effect on the loosening behavior of the hot dip galvanized bolts.
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