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首页> 外文会议>Nondestructive Evaluation and Health Monitoring of Aerospace Materials, Composites, and Civil Infrastructure V >Structural Health Monitoring of the Grondals Bridge in Sweden - the behaviour of CFRP strengthening in cold temperature
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Structural Health Monitoring of the Grondals Bridge in Sweden - the behaviour of CFRP strengthening in cold temperature

机译：瑞典Grondals桥梁的结构健康监测-低温下CFRP加固的行为

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To obtain a better knowledge of existing structures behaviour monitoring can be used. The use of monitoring in bridge structures by the use of instruments to assess the integrity of structures is not new and there are reports from structures tested as early as in the 19th century according to ISIS Canada However, the term SHM (Structural Health Monitoring) is relatively new to civil engineering and the driving force to implement SHM comes from recognising the limitations of conventional visual inspections and evaluations using conservative codes of practice. The possibilities to monitor existing structures with help of the rapidly evolving Information Technology are to day carried out. The objective of SHM is to monitor the in-situ behaviour of a structure accurately and efficiently, to assess its performance under various service conditions, to detect damage or deterioration, and to determine the health or condition of the structure. In Sweden strengthening and periodic monitoring of a large freivorbau bridge (pre-stresed concrete box girder bridge) has been carriedn out, the Grondals Bridge. The bridge is located in Stockholm and is approximately 400 m in length with a free span of 120 m. It was opened to tram traffic in year 2000. Just after opening cracks were noticed in the webs, these cracks have then increased, the size of the largest cracks exceeded 0.5 mm, and at the end of year 2001 the bridge was temporarily strengthened. This was carried out with externally placed prestressed steel stays. The reason for cracking is quite clear but the responsibility is still debated. Nevertheless, it was evidently that the bridge needed to be strengthened. The strengthening methods used were CFRP plates in the Service Limit State (SLS) and prestressed dywidag stays in the Ultimate Limit State (ULS). The strengthening was carried out during year 2002. At the same time monitoring of the bridge commenced, using LVDT crack gauges as well as optical fibre sensors. This monitoring was carried out during the summer period. In addition to this a winter monitoring was carried out in the beginning of 2005. This paper presents the background to strengthening and a comparison between summer and winter monitoring where the strengthening behaviour between the two seasons is enlightened. The result from the monitoring is very interesting; it would have been preferable to strengthen the bridge during the winter.
机译：为了更好地了解现有结构，可以使用行为监视。根据加拿大ISIS的说法，通过使用仪器来评估结构的完整性来对桥梁结构进行监测并不是什么新鲜事，并且早在19世纪就有报告对结构进行了测试。但是，术语SHM（结构健康监测）是对于土木工程而言，相对较新的技术和实施SHM的驱动力来自于认识到使用保守的操作规范进行常规外观检查和评估的局限性。如今，借助迅速发展的信息技术来监视现有结构的可能性正在得到实现。 SHM的目标是准确，有效地监视结构的原位行为，评估其在各种使用条件下的性能，检测损坏或退化，并确定结构的健康状况。在瑞典，已经对大型Freeivorbau桥（预应力混凝土箱梁桥），Grondals桥进行了加固和定期监测。该桥位于斯德哥尔摩，长约400 m，自由跨度为120 m。它于2000年开放，以用于有轨电车通行。在腹板上发现开裂裂缝之后，这些裂缝便开始增加，最大裂缝的大小超过0.5毫米，并于2001年底临时加固了这座桥。这是通过外部放置的预应力钢撑来进行的。破解的原因很明确，但责任仍在争论中。然而，显然需要加强桥梁。所使用的加固方法是：处于服务极限状态（SLS）的CFRP板和处于极限极限状态（ULS）的预应力dywidag撑杆。在2002年进行了加固。与此同时，开始使用LVDT裂纹仪和光纤传感器对桥梁进行监控。这项监视是在夏季进行的。除此之外，2005年初还进行了冬季监测。本文介绍了加强监测的背景，并比较了夏季监测和冬季监测，比较了两个季节之间的加强行为。监视的结果非常有趣。最好在冬天加固桥。

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