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首页> 外文期刊>Journal of bridge engineering >Suspender Replacement for a Signature Bridge
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Suspender Replacement for a Signature Bridge

机译：吊桥更换签名桥

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摘要

The suspender is one of the most critical members for suspension bridges. Corrosion is the greatest degradation mechanism for suspenders during their service lives. Practices in North America have shown that the average time for the replacement of suspenders is between approximately 60 and 75years. In this case study, three pairs of representative suspender ropes were removed and replaced on the Bronx-Whitestone Bridge, which was opened to traffic in 1939. The detailed suspender replacement procedure is presented. A refined three-dimensional (3D) finite-element (FE) model of the suspension bridge was developed to determine the jacking forces during replacement. To ensure that the new suspender tension reached a desirable value, an advanced vision-based sensor was adopted for noncontact force measurement, which eliminated the need for direct access to the suspender ropes to install conventional sensors. Subsequently, the existing suspenders that were removed were inspected visually. Three typical locations along suspenders, where dirt and water easily accumulate, were found to be especially vulnerable to corrosion: directly above the sockets, the section over the cable band, and at the suspender clamps. Finally, testing procedures are described to explain the estimation of the remaining ultimate strength of the removed existing ropes. The overall practices presented in this case study can help guide future suspender-rope replacements and investigations.
机译：吊架是吊桥最关键的成员之一。腐蚀是吊架使用寿命期间最大的降解机制。北美的实践表明，更换吊杆的平均时间约为60至75年。在本案例研究中，三对有代表性的吊索被拆除，并在1939年通车的布朗克斯-怀特斯通大桥上进行了更换。提出了详细的吊索更换程序。开发了悬索桥的精制三维（3D）有限元（FE）模型，以确定更换期间的顶压力。为了确保新的悬挂器张力达到理想值，采用了基于视觉的先进传感器进行非接触力测量，从而无需直接接触悬挂器绳索即可安装常规传感器。随后，目视检查已卸下的现有吊床。沿着悬挂器的三个典型位置特别容易腐蚀，容易积聚灰尘和水，这三个位置特别容易受腐蚀：在插座上方，电缆带上的部分以及悬挂器夹处。最后，描述了测试程序以解释对已拆除的现有绳索的剩余极限强度的估计。本案例研究中介绍的总体实践可以帮助指导将来的吊绳更换和调查。

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