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首页> 外文期刊>Journal of bridge engineering >Analytical Study of Uniform Thermal Effects on Cable Configuration of a Suspension Bridge during Construction
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Analytical Study of Uniform Thermal Effects on Cable Configuration of a Suspension Bridge during Construction

机译：施工期间均匀热效应对悬索桥缆线形态的分析研究

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摘要

The cable configuration of a suspension bridge is very sensitive to temperature changes. On the basis of multisegment catenary theory in combination with the conditions of geometric compatibility, mechanical equilibrium, and conservation of the unstrained cable length, an analytical method is proposed to model the temperature sensitivity of the cable configuration of suspension bridges. The main considerations were the elevation of the main cable and installation positions of cable clamps. The proposed method can adapt to different construction states (the completion state of the bridge, the free cable state, and the datum cable strand), boundary conditions (considering or not considering the saddle arc), and the stiffness of the towers (considering or not considering tower bending deformation). It is possible to switch between different cases by changing only a few parameters. An engineering example analysis was then performed for a suspension bridge with a main span of 730 m, which demonstrated the feasibility and effectiveness of the proposed method. The results showed that the deformation of the suspension bridge had a linear relationship with temperature. The construction state and bending deformation of the towers had a large impact on the temperature sensitivity coefficient of the main cable elevation. The bending deformation of the towers aggravated and lessened the temperature sensitivity coefficient of the main cable elevation for the main span and side span, respectively. The temperature sensitivity coefficient of midspan point elevation of the main cable correlated negatively to the span length. The maximum temperature sensitivity coefficient of the installation position of the cable clamp occurred near the interquartile point of the main span.
机译：吊桥的电缆配置对温度变化非常敏感。在多段接触网理论的基础上，结合几何相容性，机械平衡性和无应变电缆长度的守恒条件，提出了一种分析方法来对悬索桥的电缆温度敏感性进行建模。主要考虑因素是主电缆的高度和电缆夹的安装位置。所提出的方法可以适应不同的施工状态（桥梁的完工状态，自由缆线状态和基准缆线束），边界条件（考虑或不考虑鞍形弧）以及塔架的刚度（考虑或考虑不考虑塔架弯曲变形）。只需更改几个参数就可以在不同情况之间切换。然后对主跨为730 m的悬​​索桥进行了工程实例分析，证明了该方法的可行性和有效性。结果表明，悬索桥的变形与温度呈线性关系。塔的施工状态和弯曲变形对主电缆标高的温度敏感系数影响很大。塔架的弯曲变形分别加剧和减小了主跨段和侧跨段的主电缆标高的温度敏感性系数。主电缆中跨点高程的温度灵敏度系数与跨度长度呈负相关。电缆夹安装位置的最大温度灵敏度系数出现在主跨度的四分位点附近。

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