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Acoustic Emission Assessment of Concrete Hinge Joints

机译：混凝土铰链接头的声发射评估

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Concrete hinge joints are present in over 100 bridges in Wales and England, they were introduced into bridge decks as a means of simplifying the design and standardising details on bridges having a range of span and functional requirements. Hinged joints are not easily accessible for inspection or maintenance due to their form and their location over or under live traffic lanes. They are vulnerable to deterioration in the event of bridge deck waterproofing failure, which can cause steel reinforcement bar corrosion. This reinforcement is crucial to the integrity of the joint, and the loss of reinforcement section can induce higher stresses leading to eventual failure by yielding. The aim of these investigations was to determine the effectiveness of the Acoustic Emission (AE) technique in detecting defects in reinforced concrete bridge hinge joints. A laboratory investigation was completed on a 1m length of reinforcement bar. Sensors were attached to the bar during fatigue loading and a fatigue crack monitored. The tests showed that it was possible to locate fatigue cracks within reinforcement bars. A field trial was completed on one hinge joint on the M4 River Usk Crossing. Sensors were attached to the reinforcement steel using wave-guides and onto the concrete face of the joint. Monitoring was undertaken during a one-day period of normal traffic loading and via a series of controlled load tests. Located AE emissions associated with the steel work were low in energy level and activity which suggested that there was no active damage associated with this particular hinge joint, this result was confirmed by X-ray monitoring.
机译：在威尔士和英格兰的100座桥梁中都存在混凝土铰链接头，它们被引入桥面板中，以简化具有一定跨度和功能要求的桥梁的设计并标准化细节。由于铰接接头的形式以及它们在实时行车道上方或下方的位置，因此不易进行检查或维护。如果桥面防水失败，它们很容易变质，这会导致钢筋腐蚀。这种加强对于接头的完整性至关重要，而加强部分的损失会引起较高的应力，最终导致屈服而导致破坏。这些研究的目的是确定声发射（AE）技术在检测钢筋混凝土桥梁铰链接头缺陷中的有效性。在长度为1m的钢筋上完成了实验室调查。在疲劳载荷期间将传感器连接到钢筋，并监测疲劳裂纹。测试表明，可以在钢筋内找到疲劳裂纹。在M4 River Usk Crossing的一个铰链接头上完成了现场试验。使用波导管将传感器连接到钢筋，并连接到接头的混凝土表面。在正常流量负载的一日内并通过一系列受控负载测试进行了监视。与钢结构相关的定位AE排放的能量水平和活性较低，这表明该特定的铰链接头没有主动损坏，这一结果已通过X射线监测得以证实。

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