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首页> 外文会议>International Conference on Current and Future Trends in Bridge Design, Construction and Maintenance 2: Safety, Economy, Sustainability and Aesthetics, Apr 25-26, 2001, Hong Kong >Vibration Induced Fatigue of Overhead Sign Structures on Elevated Highway Bridges
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Vibration Induced Fatigue of Overhead Sign Structures on Elevated Highway Bridges

机译：高架公路桥梁架空标志结构的振动引起的疲劳

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Fatigue cracks were found at the joint of the tubular sign frame during inspection and it was replaced promptly. Vibration and stress measurement was carried out for a newly installed sign frame. The followings summarize the results. 1) The dominant vibration of the base of the sign frame was between 2 and 4 Hz, which seems to he mainly due to the running trucks in service. 2) In service condition the maximum acceleration was 1.2 to 1.8 times more than that due to the test truck of 196kN. 3) Hourly number of cycles of acceleration and stresses were 5 to 10 times of the hourly number of traffics in service. It indicates that the number of cycles needed for fatigue life estimation can be estimated by daily traffics or daily truck traffics. 4) The stiffening rib ends near the base of the sign frame, which seems most critical in terms of fatigue cracking, showed over 80 years of fatigue life, and we concluded that they have sufficiently long fatigue life, provided that the traffic condition would be the same in the future.
机译：在检查过程中，在管状标牌框架的接头处发现了疲劳裂纹，并立即进行了更换。对新安装的标牌架进行了振动和应力测量。以下总结了结果。 1）标牌框架底部的主要振动在2到4 Hz之间，这似乎主要是由于运行中的卡车在运转。 2）在使用条件下，最大加速度是196kN的试验车的1.2至1.8倍。 3）每小时加速和压力循环次数是每小时服务流量的5到10倍。它表明，疲劳寿命估算所需的循环次数可以通过每天的交通量或每天的卡车交通量来估算。 4）加筋肋条的末端靠近标牌框架的底部，这似乎是疲劳裂纹最关键的部分，显示出超过80年的疲劳寿命，我们得出的结论是，只要在交通条件良好的情况下，它们具有足够长的疲劳寿命。将来一样。

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