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首页> 外文期刊>International journal of steel structures >Effect of Structural Change on Temperature Behavior of a Long-Span Suspension Bridge Pylon
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Effect of Structural Change on Temperature Behavior of a Long-Span Suspension Bridge Pylon

机译：结构变化对大跨度悬索桥塔温度行为的影响

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摘要

The effect of structural changes on the temperature behavior of a long-span bridge pylon was examined using field-measured data and finite element (FE) analysis. Temperature behavior of the pylon could be modeled using two characteristic parameters, alpha and beta, which reflect the influence of the variation in the ambient temperature and the sectional temperature difference, respectively. Two major structural changes namely, decrease in stiffness in the lower region of the pylon and decrease in area of the main cable were considered in the FE analyses, which showed that both alpha and beta were affected by the structural changes. Furthermore, the two characteristic parameters could be extracted with sufficient accuracy from field-measured temperatures and tilting angle data using a system-identification technique. Consequently, the feasibility of identification of structural changes by continuous observation of temperature parameters was demonstrated. However, the tilting angle of the pylon is influenced by other loads than the temperature and therefore future studies on eliminating other loading effects (such as that owing to wind or traffic) are necessary.
机译：使用现场测量的数据和有限元（FE）分析检查了结构变化对大跨度桥梁塔架温度行为的影响。可以使用两个特征参数（α和β）对塔的温度行为进行建模，这两个参数分别反映环境温度变化和截面温度差的影响。有限元分析中考虑了两个主要的结构变化，即塔架下部区域的刚度降低和主缆线的面积减小，这表明α和β都受到结构变化的影响。此外，可以使用系统识别技术从实测温度和倾角数据中以足够的精度提取两个特征参数。因此，证明了通过连续观察温度参数来鉴定结构变化的可行性。但是，塔架的倾斜角度受温度以外的其他载荷的影响，因此有必要进一步研究消除其他载荷效应（例如由于风或交通引起的载荷效应）。

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