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首页> 外文期刊>Proceedings of the Institution of Civil Engineers >Replacement of the stays on a major cable-stayed bridge
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Replacement of the stays on a major cable-stayed bridge

机译：更换主要斜拉桥上的支柱

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摘要

The bridge discussed in this paper was completed in 1985 and is part of a vital sea crossing. The main cable-stayed bridge has a span of 225 m with side spans of 107.5 m. The bridge carries two three-lane carriageways. The bridge cables comprise lengths of coupled high-yield bars within a grouted steel tube. An assessment of the structure in 1996-1999, using modern design standards, identified large overstress in the shortest cables anchored close to the pylons. Other cables were also found to be over-stressed, but to a lesser degree. Bearings were thus installed at the piers to relieve load from the shortest cables and the second shortest sets of cables were replaced. An acoustic monitoring system was also installed on all cables to detect any problems. Since then, two bar breaks were detected in other cables, which have been replaced. Inspection and testing showed fatigue of the couplers to be responsible for the breaks. Following the first bar break detected in December 2004, an additional assessment was completed by Atkins. This paper describes the assessment of the bridge cables, examines the consequences of cable failure and discusses the reasons why the decision to replace all the cable stays was made. It also describes the specification for the new replacement stay system and its advantages over the old system.
机译：本文讨论的桥梁于1985年完工，是重要海上过境的一部分。主斜拉桥的跨度为225 m，侧跨为107.5 m。这座桥有两条三车道的车道。桥接电缆包括在灌浆钢管内的耦合的高屈服钢筋的长度。使用现代设计标准对1996-1999年的结构进行评估，发现锚定在靠近塔架的最短电缆中存在较大的过应力。还发现其他电缆应力过大，但程度较小。因此，在码头安装了轴承，以减轻最短电缆的负荷，并更换了第二短的电缆组。还在所有电缆上安装了声音监视系统，以检测任何问题。从那时起，在其他电缆中检测到两个断条，已将其更换。检查和测试表明，耦合器的疲劳是造成断裂的原因。在2004年12月发现第一个中断之后，阿特金斯（Atkins）完成了另一项评估。本文介绍了桥电缆的评估，检查了电缆故障的后果，并讨论了做出更换所有电缆撑杆的决定的原因。它还描述了新的替换撑杆系统的规格及其相对于旧系统的优势。

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