Dynamic Method of Neutral Axis Position Determination and Damage Identification with Distributed Long-Gauge FBG Sensors.
Dynamic Method of Neutral Axis Position Determination and Damage Identification with Distributed Long-Gauge FBG Sensors.
复制标题
分布式长规格光纤光栅传感器中性轴位置确定和损伤识别的动态方法
DOI：
10.3390/s17020411
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发表时间：
2017-02-20
期刊：
影响因子：
--
通讯作者：
Ren Z
中科院分区：
文献类型：
--
作者：
Tang Y;Ren Z
受弯构件的中性轴位置是结构设计和安全评估的重要参数。基于传统方法的NAP测量精度不能满足结构性能评估的要求，特别是在交通荷载作用下。本文提出了一种利用模态宏观应变（MMS）测定NAP的新方法。该方法首先利用长标距光纤布拉格光栅（FBG）传感器测量宏观应变，然后通过傅立叶变换将测量的宏观应变生成MMS，最后由MMS确定中性轴位置系数（NAPC），并利用NAPC计算中性轴深度。为了验证该方法的有效性，进行了有限元模型、钢梁和钢筋混凝土梁的试验研究。根据计算结果，首次用第一弯曲模态的MMS验证了平面截面。结果表明，该方法具有较高的准确性和稳定性。结果还证明，NAPC是一个很好的指标，局部损伤。总之，所提出的方法，准确的评估弯曲结构可以促进。
The neutral axis position (NAP) is a key parameter of a flexural member for structure design and safety evaluation. The accuracy of NAP measurement based on traditional methods does not satisfy the demands of structural performance assessment especially under live traffic loads. In this paper, a new method to determine NAP is developed by using modal macro-strain (MMS). In the proposed method, macro-strain is first measured with long-gauge Fiber Bragg Grating (FBG) sensors; then the MMS is generated from the measured macro-strain with Fourier transform; and finally the neutral axis position coefficient (NAPC) is determined from the MMS and the neutral axis depth is calculated with NAPC. To verify the effectiveness of the proposed method, some experiments on FE models, steel beam and reinforced concrete (RC) beam were conducted. From the results, the plane section was first verified with MMS of the first bending mode. Then the results confirmed the high accuracy and stability for assessing NAP. The results also proved that the NAPC was a good indicator of local damage. In summary, with the proposed method, accurate assessment of flexural structures can be facilitated.