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Monitoring the Degradation of Reinforced Concrete Beams under Cyclic Loading

机译：循环荷载下钢筋混凝土梁的劣化监测

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A particular problem when developing a structural health monitoring system for bridges is that it is not easy to obtain data for the whole design life (～125 years) of a test bridge in order to validate the system. Many earlier studies have therefore concentrated on detecting specific artificially induced damage regimes, which in some cases bear little resemblance to the damage observed on prototype structures. To overcome this problem, a pilot study to produce an accelerated whole-life loading regime has been carried out on a set of four reinforced concrete beams. The beams were each subjected to cyclic load (c. 10 million cycles) of varying amplitudes ranging from 25 % to 50% of the ultimate capacity of the beams. At regular intervals the natural frequencies and mode shapes were monitored. The results showed that there was a weak but discernible trend of a reduction in natural frequency with increasing cycle number. However, the natural frequencies were most sensitive to crack height, which was load, rather than cycle number, dependent. Other monitoring parameters, such as cosh spectral distance and reciprocity were less sensitive, although repeated FE model updating was able to detect a gradual reduction in Young's modulus of the concrete.
机译：开发桥梁结构健康监测系统时的一个特殊问题是，要验证该系统，要获得整个测试桥梁整个设计寿命（约125年）的数据并不容易。因此，许多较早的研究都集中在检测特定的人为诱发的损伤机制，在某些情况下，这种机制与在原型结构上观察到的损伤几乎没有相似之处。为了克服这个问题，已经对一组四个钢筋混凝土梁进行了初步研究以产生加速的全寿命加载方案。每根梁承受的循环载荷（约1000万个循环）的幅度变化范围为梁的极限承载力的25％至50％。定期监测固有频率和振型。结果表明，随着循环次数的增加，自然频率降低的趋势微弱但可辨别。但是，固有频率对裂纹高度最敏感，裂纹高度取决于载荷而不是循环次数。尽管重复的有限元模型更新能够检测到混凝土的杨氏模量逐渐降低，但其他监测参数（如cosh光谱距离和互易性）的敏感性较低。

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