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首页> 外文会议>Annual international bridge conference >Ironton Russell Bridge – WindConsiderations and Remedial Issues for aNarrow Long Span Single Tower Cable-Stayed Bridge
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Ironton Russell Bridge – WindConsiderations and Remedial Issues for aNarrow Long Span Single Tower Cable-Stayed Bridge

机译：Ironton Russell桥–狭窄的大跨度单塔斜拉桥的风电考虑和补救问题

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The 950 ft main span of the Ironton Russell Cable-Stayed Bridge has a deck width of just less than60 ft with 7 ft deep steel edge girders. This represents the longest span single tower cable-stayed bridge withsteel edge girders in North America. The Ironton Russell Bridge, currently in final design, will cross the Ohio Riverbetween Ironton, Ohio and Russell, Kentucky. The actual superstructure height (including barriers) isapproximately 12 ft and that indicates a relatively low ratio of the deck width to depth of 5.0. Utilizing frequenciesobtained from a finite element model of the bridge, wind tunnel testing was done to evaluate effects of bothflutter (torsional critical stability) and vortex shedding (vertical comfort stability). The need to balance torsionalstiffness (affected by the edge girder depth or stiffness) with detrimental effects of a bluff structure presented aninteresting challenge. A number of aerodynamic solutions were investigated in order to reduce vortex sheddingwhile also maintaining a safe level of flutter stability. After obtaining an aerodynamic solution utilizing large windfairings on the edge girder, an evaluation was conducted considering both aesthetics and the additional cost ofsuch fairings. A non-aerodynamic solution was proposed which utilized Tuned Massed Dampers (TMD) to controleffects of vortex shedding. This proved to be both a cost effective and an aesthetically reasonable solution to theissue. The Ironton Russell Bridge will be the first traffic cable-stayed structure in North America to use TMDs tomitigate bridge deck wind stability issues.
机译：Ironton Russell斜拉桥的950英尺主跨的甲板宽度刚好小于 60英尺（7英尺深的钢制边缘大梁）。这代表了最长跨度的单塔斜拉桥， 北美的钢制边梁。 Ironton Russell大桥目前正在最终设计中，它将穿越俄亥俄州河 在俄亥俄州铁顿和肯塔基州罗素之间。上层建筑的实际高度（包括障碍物）为 大约12英尺，表示甲板宽度与深度的比率相对较低，为5.0。利用频率 从桥梁的有限元模型获得，进行风洞测试以评估两者的影响 颤振（扭转临界稳定性）和涡流脱落（垂直舒适稳定性）。需要平衡扭转 刚度（受边缘梁深度或刚度的影响）以及钝性结构的不利影响 有趣的挑战。为了减少涡流脱落，研究了许多空气动力学解决方案 同时还可以确保颤振稳定性的安全水平。在获得利用大风的空气动力学解决方案之后 在边梁的整流罩上，进行了评估，同时考虑了美学和附加成本 这样的整流罩。提出了一种非气动解决方案，该方案利用调谐质量阻尼器（TMD）进行控制 涡流脱落的影响。事实证明，这既是一种成本效益又是一种美学上合理的解决方案。 问题。 Ironton Russell桥将是北美第一个使用TMD的交通斜拉结构 缓解桥面风的稳定性问题。

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