基于阻尼特性的RC简支梁桥损伤识别分析及试验研究

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摘要基于频率和振型等基本动力参数的损伤识别方法存在不足，准确性和适用性有待改进。提出将阻尼作为损伤识别的指标，探究阻尼与结构损伤之间的关系。论述阻尼与结构裂缝的数量和宽度及损伤演变的关系。通过对一跨简支T梁桥试验，采用自由振动法求阻尼比，获得了不同损伤等级损伤演变下的阻尼比。结果表明阻尼比随着损伤等级的增加呈现先增大后减小的变化过程，且正负位移对应的阻尼比的差值也具有先增大后减小的演化规律。阻尼比变化率大的位置，损伤程度大，可以利用阻尼比变化率实现基本损伤定位。与频率和振型相比，阻尼比更丰富敏感，可以作为钢筋混凝土桥梁的损伤识别指标，其拐点可以作为结构加固及维修的预警阀值。

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关键词 ：损伤识别, 钢筋混凝土桥梁, 阻尼比, 自由振动, 裂缝

Abstract：Damage detection method based on frequency and vibration and other basic dynamic parameters are deficient, the corresponding accuracy and applicability should be improved. Damping ratio is proposed as an indicator for damage detection in order to explore the relationship between the damping and structural damage. Analysis the relationship between damping and the number and width of structural crack and damage evolution. Through a simply supported T beams bridge experiment, free vibration method is used to calculate damping ratio, and damping ratios under different damage grades are obtained. The results showed that the damping ratio and the corresponding damping ratio of positive and negative displacement increases at first, then decreases with the damage grade increases. The location where the change rate of damping ratio is larger is the position severe damages occur. Thus, basic damage location detection can be realized by the difference of damping ratio. Compared with frequency and modes, damping ratio is more sensitive and diverse, so it can be used as indicators of damage detection for reinforced concrete bridge, and the inflection point as structural reinforcement and maintenance of early warning threshold.

Key words： Damage detection reinforced concrete bridge damping ratio free vibration crack

收稿日期: 2016-01-29 出版日期: 2017-06-28

引用本文:

陈彦江1，钱亚运1，李洪泉1，何浩祥1,2，闫维明1,2. 基于阻尼特性的RC简支梁桥损伤识别分析及试验研究[J]. 振动与冲击, 2017, 36(13): 208-213.
Chen Yan-jiang1 QIAN Ya-yun1, Li Hong-quan1 HE Hao-xiang1,2, YAN Wei-ming1,2. Theoretical and experimental study on damage detection of RC simply supported girder bridge based on damping characteristics. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(13): 208-213.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I13/208

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