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首页> 外文会议>Engineers Society of Western Pennsylvania Annual International Bridge Conference; 20070604-06; Pittsburgh,PA(US) >Key Technology Study on Design and Construction for Wushan Yangtze River Bridge
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Key Technology Study on Design and Construction for Wushan Yangtze River Bridge

机译：巫山长江大桥设计与施工关键技术研究

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摘要

Wushan Bridge over the Yangtze River in Chongqing was opened to traffic in January 2005. The main span at Wuxis is a half-through CFST (concrete-filled steel tubular) arch bridge with a single, double-ribbed, 460m-long pure-span. This bridge has the greatest span, caliber, and segment-carrying load of any CFST arch bridge in the world. In the process of designing and constructing this bridge, many new technologies were applied. Regarding the design theory, we considered CFST shrinkage and creeping computation theory, computation of CFST-node stress-concentration and fatigue-life, and making test analyses of the ultimate CFST load. Considering the design, we optimized the structural system according to the inner-force equilibrium to get the largest bending moments and axial force between the upper and lower chords. We also designed the main arch with a conspicuous attenuating outline, the inner flange joints of the arch rib, and a longitudinal caging suspender device. For construction, we applied new technology and aesthetic principles, such as adopting head-mast hinged bearings on the tower, compound-type anchors, low-stress clip-anchor systems capable of cable-stress adjustment, and initiative bearing-rope devices. We used self-stress concrete, as well as concrete continuously pumped into the steel tubing segment by segment. These research findings have momentous practical and theoretical value for improving the design and construction of extraordinarily long-span, CFCT arch bridges.
机译：重庆长江上的巫山大桥于2005年1月通车。无锡市的主要跨度是半贯通CFST（钢管混凝土）拱桥，它具有460m长的单双肋纯跨度。与世界上任何CFST拱桥相比，这座桥具有最大的跨度，口径和分段承载力。在设计和建造这座桥梁的过程中，应用了许多新技术。关于设计理论，我们考虑了CFST的收缩和蠕变计算理论，CFST节点应力集中和疲劳寿命的计算，并对CFST的极限载荷进行了试验分析。考虑到设计，我们根据内力平衡对结构系统进行了优化，以获得最大的弯矩和上下弦之间的轴向力。我们还设计了具有明显衰减轮廓的主拱，拱肋的内部法兰接头和纵向笼式悬挂装置。在建筑方面，我们采用了新技术和美学原则，例如在塔上采用了桅杆式铰链轴承，复合型锚，能够进行缆索应力调节的低应力夹式锚固系统以及主动式轴承绳索装置。我们使用自应力混凝土，以及将混凝土逐段连续泵入钢管的方法。这些研究成果对于改进超大跨度CFCT拱桥的设计和施工具有重要的实践和理论价值。

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