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首页> 外文会议>Engineers Society of Western Pennsylvania Annual International Bridge Conference; 20070604-06; Pittsburgh,PA(US) >Cable-Stayed Bridges - Discovering Alarming Distress and Damage
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Cable-Stayed Bridges - Discovering Alarming Distress and Damage

机译：斜拉桥-发现令人担忧的灾难和损坏

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摘要

Recent inspections of cable-stayed bridges have led to discovery of significant deterioration that appears alarmingly consistent across many types of cable-stayed bridges and stay cable designs. Results have shown that sound construction and design practices must take into account durability and maintenance of cables to assure adequate service life. This paper describes observations and findings from a recently completed evaluation program for the stay cables of the Luling Bridge in Louisiana. For this program, unique access methods and advanced non-destructive techniques were utilized. In addition to widely publicized vibration related problems, a series of shortcomings and damage associated with the design, fabrication, and installation of stay cables were discovered. Deck-level anchorages in this bridge have been exposed to corrosive environment due to damaged seals and joints, and lack of proper drainage. A variety of damages to the corrosion barriers along the cable free lengths were observed, in some cases resulting in exposure and corrosion of the main tension elements. Aging, residual strains, temperature effects, and fatigue in the cable cover pipe were recognized as major sources for these problems. A damage severity rating system was established based on criticality of damages and need for action. Thirty nine out of total of the 72 cables were rated critical and therefore require timely corrective action. It is believed that the observed damages could be present and potentially threaten the integrity of other bridges with similar cable systems.
机译：最近对斜拉桥的检查导致发现了显着恶化，这种恶化在许多类型的斜拉桥和斜拉索设计中似乎都令人震惊地一致。结果表明，合理的构造和设计实践必须考虑电缆的耐用性和维护，以确保足够的使用寿命。本文介绍了最近完成的路易斯安那州Luling桥斜拉索评估方案的观察结果。对于此程序，使用了独特的访问方法和先进的非破坏性技术。除了广为人知的振动相关问题外，还发现了与斜拉索的设计，制造和安装相关的一系列缺陷和损坏。由于密封件和接头的损坏以及缺乏适当的排水，该桥的甲板级锚固已暴露于腐蚀性环境中。沿电缆自由长度观察到对腐蚀屏障的各种破坏，在某些情况下导致主要受拉元件暴露和腐蚀。电缆盖管中的老化，残余应变，温度影响和疲劳被认为是造成这些问题的主要原因。根据损害的严重程度和需要采取的行动，建立了损害严重性评估系统。在72条电缆中，有39条被评为“严重”，因此需要及时采取纠正措施。据信，可能会出现观察到的损坏，并可能威胁到具有类似电缆系统的其他桥梁的完整性。

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