A Novel Elastomer-Based Inclinometer for Ultrasensitive Bridge Rotation Measurement

被引:2
|
作者
Zhou, De [1 ]
Wang, Ningbo [1 ]
Fu, Chaofeng [1 ]
Guo, Chuanrui [2 ]
Zhao, Yangping [2 ]
机构
[1] Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China
[2] Shenzhen Univ, Coll Civil & Transportat Engn, Inst Urban Smart Transportat & Safety Maintenance, Shenzhen 518060, Peoples R China
基金
中国国家自然科学基金;
关键词
inclinometer; bridge rotation; elastomer; health monitoring; ultrasensitive measurement; DAMAGE DETECTION;
D O I
10.3390/s22072715
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Bridge deformation consists of cross-section rotation and deflection, which are crucial parameters for bridge capacity evaluation and damage detection. The maximum value of deflection usually happens at mid-span while for rotation it happens at two-ends. Therefore, compared with deflection, rotation is more convenient for in-situ measurement since the bridge pier can be the reference point. In this study, a high-precision inclinometer for bridge rotation measurement was conceptualized, designed, and validated. The proposed inclinometer converted the small rotation of bridge section into the deformation of an elastomer. Strain gauges were then utilized to measure the elastomer deformation and thus the bridge rotation can be obtained. The dimensions and modulus of the elastomer were designed and chosen based on the theoretical analysis. Characteristics of the inclinometer were calibrated in lab and in-situ experiments at an in-service bridge were conducted to validate its feasibility and robustness. Test results showed that the proposed inclinometer had excellent performance in resolution and accuracy, which indicate its great potential for future bridge health monitoring.
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页数:15
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