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Natural Frequency Response Evaluation for RC Beams Affected by Steel Corrosion Using Acceleration Sensors.
Sensors ( IF 3.9 ) Pub Date : 2020-09-17 , DOI: 10.3390/s20185335
Yuwei Zhang 1 , Yongchun Cheng 1 , Guojin Tan 1 , Xiang Lyu 1 , Xun Sun 1 , Yunshuo Bai 1 , Shuting Yang 1
Affiliation  

This paper presented a laboratory investigation for analyzing the natural frequency response of reinforced concrete (RC) beams affected by steel corrosion. The electrochemical acceleration technique induced the corroded RC beams until the predetermined value of the steel corrosion ratio was achieved. Then, the natural frequency responses of the corroded beams were tested utilizing piezoelectric acceleration sensors. The damage states of the corroded beams were assessed through the measurement of crack parameters and the equivalent elastic modulus of the beams, which aims to clarify the fundamental characteristics of the dynamic response for the corroded RC beam with the increased steel corrosion ratio. The results revealed that steel corrosion reduces the bending stiffness of the RC beams and, thus, reduces the modal frequency. The variation of natural frequency can identify the corrosion damage even if no surface cracking of the RC beam, and the second-order frequency should be more indicative of the damage scenario. The degradations of stiffness and the natural frequency were estimated in this study by the free vibration equation of a simply supported beam, and a prediction method for the RC beam’s residual service life was established. This study supports the use of variations in natural frequency as one diagnostic indicator to evaluate the health of RC bridge structures.

中文翻译:

使用加速度传感器评估受钢腐蚀影响的RC梁的固有频率响应。

本文提出了一项实验室研究,以分析受钢腐蚀影响的钢筋混凝土(RC)梁的固有频率响应。电化学加速技术诱导腐蚀的RC梁,直到达到钢腐蚀率的预定值为止。然后,利用压电加速度传感器测试了腐蚀梁的固有频率响应。通过测量裂纹参数和当量弹性模量,评估了锈蚀梁的损伤状态,目的是弄清随着钢的腐蚀比增加,锈蚀RC梁的动力响应的基本特征。结果表明,钢腐蚀降低了RC梁的弯曲刚度,从而降低了模态频率。即使RC梁没有表面开裂,自然频率的变化也可以识别腐蚀损伤,并且二次频率应更能指示损伤情况。通过简单支撑梁的自由振动方程估算了刚度和固有频率的衰减,并建立了钢筋混凝土梁剩余使用寿命的预测方法。这项研究支持使用固有频率的变化作为一种​​诊断指标,以评估RC桥梁结构的健康状况。通过简单支撑梁的自由振动方程估算了刚度和固有频率的衰减,并建立了钢筋混凝土梁剩余使用寿命的预测方法。这项研究支持使用固有频率的变化作为一种​​诊断指标,以评估RC桥梁结构的健康状况。通过简支梁的自由振动方程估算了刚度和固有频率的衰减,建立了RC梁剩余使用寿命的预测方法。这项研究支持使用固有频率的变化作为一种​​诊断指标,以评估RC桥梁结构的健康状况。
更新日期:2020-09-18
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