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首页> 外文会议>Practical knowledge, worldly wisdom amp; extraordinary ingenuity >Condition Assessment of GFRP Composite Wrapped Timber Railroad Ties and Timber Bridge Piles Using Infrared Thermography
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Condition Assessment of GFRP Composite Wrapped Timber Railroad Ties and Timber Bridge Piles Using Infrared Thermography

机译：GFRP复合材料包裹的铁路铁轨和木桥桩的红外热成像条件评估

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A large number of timber railroad bridges in the eastern United States are over 50 to 100 years old. In many cases, these bridges are part of critical supply routes for rural towns. The support structure (timber piles) for many of these bridges have developed significant areas of decay due to flooding in the underlying rivers or creeks. Due to the rising cost of bridge replacements, a more cost-effective approach is to wrap the timber piles and pile caps with glass fiber reinforced polymer (GFRP) composite fabrics. Such wrapping can greatly improve the strength and ductility of the members and prolong the service life of these timber bridges. In addition, old timber railroad ties can be encased in GFRP to form a strong and durable composite tie with wooden core. This procedure can lead to recycling of millions of deteriorated railroad ties by putting them back in service. Though composite wrapping or encasing offers many advantages, subsurface defects such as debonds and voids may be introduced during the initial rehabilitation or in-service stage, which can affect the structural integrity and durability of the rehabilitated structure. Hence proper quality control must be ensured during the initial rehabilitation process. In addition, timely detection and repair of the subsurface defects is needed during service in order to achieve best results.This paper presents infrared thermography case studies from several rehabilitated timber railroad bridges which are currently in service. The paper also includes infrared thermography studies in the laboratory and field setting for GFRP encased timber railroad ties. Infrared thermography has been found to be very effective in detecting debonds and voids between the GFRP wraps and the underlying timber member. The infrared thermography data demonstrates the usefulness of this nondestructive testing technique for quality control during the rehabilitation stage and for periodic in-service monitoring of rehabilitated timber railroad bridge components.
机译：美国东部的许多木材铁路桥梁已有50到100年的历史。在许多情况下，这些桥梁是农村小镇重要补给路线的一部分。由于下面的河流或小河的洪水，许多桥梁的支撑结构（木桩）已经出现了明显的腐烂区域。由于桥梁更换成本的上涨，一种更具成本效益的方法是用玻璃纤维增​​强聚合物（GFRP）复合织物包裹木桩和桩帽。这种包裹可以大大提高构件的强度和延展性，并延长这些木桥的使用寿命。此外，可以将旧的木材铁路绑带包裹在GFRP中，以形成坚固耐用的复合木芯绑带。通过重新使用，此程序可以导致数百万变质的铁路枕木的回收。尽管复合材料包裹或包装具有许多优点，但在最初的修复或使用阶段可能会引入诸如脱胶和空隙之类的地下缺陷，这会影响修复后结构的结构完整性和耐用性。因此，在最初的恢复过程中必须确保适当的质量控制。此外，在维修期间还需要及时检测和修复地下缺陷，以取得最佳效果。本文介绍了一些目前正在使用中的修复木铁路桥梁的红外热成像案例研究。本文还包括在实验室和现场设置的GFRP包裹的木铁路枕木的红外热成像研究。已经发现，红外热成像技术对于检测GFRP包裹物和下层木材之间的脱胶和空隙非常有效。红外热成像数据证明了这种无损检测技术对修复阶段的质量控制以及对修复后的木材铁路桥梁组件进行定期在役监测的有用性。

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  • 会议地点 Orlando FL(US)
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    Udaya B. Halabe; Krishna C. Nandam; Srinivas Majiga; Nagavardhana K. Perisetty; Hota VS. GangaRao;

  • 作者单位

    West Virginia University Department of Civil and Environmental Engineering, Constructed Facilities Center Morgantown, WV 26506-6103;

    West Virginia University Department of Civil and Environmental Engineering, Constructed Facilities Center Morgantown, WV 26506-6103;

    West Virginia University Department of Civil and Environmental Engineering, Constructed Facilities Center Morgantown, WV 26506-6103;

    West Virginia University Department of Civil and Environmental Engineering, Constructed Facilities Center Morgantown, WV 26506-6103;

    West Virginia University Department of Civil and Environmental Engineering, Constructed Facilities Center Morgantown, WV 26506-6103;

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