This paper presents the results of 28-month-long monitoring of a slab portion of the Chillon viaducts in Switzerland using strain gauges and thermocouples. This post-tensioned reinforced concrete structure was strengthened with a layer of reinforced ultrahigh-performance fibre-reinforced cementitious composite (UHPFRC). The strain gauges are used to measure stresses in the bottom layer of reinforcement bars in the slab, while thermocouples explain the behaviour of the structure due to temperature variation. The response under both traffic and thermal actions is discussed. It is demonstrated that the stress variation due to the thermal action can be as large as the response due to traffic action even in such a massive structure. Furthermore, recommendations for analysing both traffic and thermal-induced stresses are given. The commonly used simplified method for calculation of fatigue stress is shown to be highly conservative, leading to overestimation of structural action effects by a factor of four.

中文翻译：

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通过R-UHPFRC层加强的RC桥面板上交通和温度影响的长期应变测量

本文介绍了使用应变片和热电偶对瑞士西庸高架桥板部分进行28个月的监测的结果。后张钢筋混凝土结构通过一层增强的超高性能纤维增强水泥基复合材料（UHPFRC）得以增强。应变仪用于测量平板中钢筋底层的应力，而热电偶则说明温度变化引起的结构行为。讨论了交通和热作用下的响应。结果表明，即使在如此大的结构中，由于热作用引起的应力变化也可以与由于交通作用引起的响应一样大。此外，给出了分析交通压力和热应力的建议。