Thermal actions on a steel box girder bridge
Thermal actions on a steel box girder bridge
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DOI：
10.1680/stbu.2003.156.2.175
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发表时间：
2003-05
期刊：
影响因子：
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通讯作者：
J. Lucas;A. Berred;C. Louis
中科院分区：
文献类型：
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作者：
J. Lucas;A. Berred;C. Louis
大多数关于桥梁热作用的研究都是针对混凝土结构的。本文主要对钢箱梁桥进行分析。统计分析是基于放置在法国诺曼底大桥上适当位置的温度计收集的三年数据。温度-时间序列通常包含确定性部分和随机部分。确定性成分是由于全年的自然季节波动。在诺曼底大桥的情况下也观察到同样的现象。在设计阶段，工程师需要了解热作用的极端波动（平均温度和热梯度），以确保结构的耐久性和安全性。设计规范规定了称为特征值的极端值，定义为50年的返回周期。统计分析允许计算这些特征值以及频繁值和准永久值。
Most studies of thermal actions on bridges have been devoted to concrete structures. In this paper, we focus our analysis on steel box girder bridges. The statistical analysis is based on data collected over a three-year period by temperature gauges placed in appropriate places on the Normandy Bridge, France. Temperature–time series are generally known to contain a deterministic and a random part. The deterministic component is due to the natural seasonal fluctuation over a whole year. The same phenomenon has been observed in the case of the Normandy Bridge. At design stage, engineers need to know the extreme fluctuations of thermal actions (average temperature and thermal gradient) to ensure the durability and safety of a structure. Design codes prescribe extreme values called characteristic values defined on a return period of 50 years. The statistical analysis allows the calculation of these characteristic values as well as frequent and quasi-permanent values.